Petrogenesis of Late Cretaceous magmatic rocks in the Zhongcang area of northern Tibet and their implications for early uplift of the plateau

doi:10.13745/j.esf.sf.2023.11.61

Abstract

Abstract:

During the late Cretaceous, extensive magmatic activity erupted in the central Tibetan Plateau, accompanied by rapid surface uplift. However, the deep dynamical mechanisms behind this phenomenon have been a subject of considerable debate. This study conducts U-Pb zircon dating, as well as analyses of whole-rock major and trace elements and Sr-Nd-Hf isotopes on the diorite and rhyolite developed in the Zhongcang area of northern Tibet, aiming to provide new constraints on regional tectonic-magmatic evolution. The U-Pb zircon dating results indicate that both the diorite and rhyolite formed in the Late Cretaceous (90—85 Ma). The geochemical characteristics of the diorite show high Sr, low Y content, and high Sr/Y ratios, indicating an affinity to adakite. Combined with its high Mg^#, it is proposed to be a product of the mixing of underplated eclogite-facies lower crustal melts with mantle materials. The geochemical and isotopic characteristics of the rhyolite are similar to those of the diorite, reflecting a common magmatic source. However, its significant depletion in Rb, Ba, Sr, and other easily altered elements suggests it underwent intense alteration during the late diagenesis. Coupled with the contemporaneous eruption of high-Mg adakitic magma and large-scale molasse deposition in the region, this study posits that the tectonic-magmatic activity in the central Tibetan Plateau during the Late Cretaceous was a result of the thickening and detachment of the lower crust following the collision of the Bangong Lake—Nujiang suture zone. This deep detachment simultaneously triggered rapid surface uplift, forming a Cretaceous paleo-plateau and laying the foundation for the modern plateau’s formation.

Key words: Bangong Lake—Nujiang suture zone, Late Cretaceous, rock genesis, detachment, plateau uplift

CLC Number:

WU Hao, YANG Chen, WU Yanwang, LI Cai, LIU Fei, LIN Zhaoxu. Petrogenesis of Late Cretaceous magmatic rocks in the Zhongcang area of northern Tibet and their implications for early uplift of the plateau[J]. Earth Science Frontiers, 2024, 31(6): 261-281.

Figures/Tables 14

Fig.1 Simplified geological map of the study area. (a) Tectonic subdivision of the Lhasa Terrane.(b) Simplified geological map of the Zhongcang area, northern Tibet.

Fig.2 Field and petrographical photos of diorite porphyrite and dacite

Table 1 LA-ICP-MS zircon isotopic U-Pb analyses for diorite porphyrites

样号及测点			同位素比值及误差																		年龄及误差/Ma
样号及测点			²⁰⁷Pb/²⁰⁶Pb			1σ			²⁰⁷Pb/²³⁵U			1σ			²⁰⁶Pb/²³⁸U			1σ			²⁰⁷Pb/²⁰⁶Pb			1σ		²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
闪长玢岩(Q17T6)
Q17T6-01			0.048 46			0.001 72			0.139 64			0.004 99			0.020 80			0.000 23			122			63		133	4	133	1
Q17T6-02			0.049 44			0.002 17			0.162 37			0.006 74			0.023 88			0.000 28			169			75		153	6	152	2
Q17T6-03^*			0.053 62			0.003 48			0.100 96			0.005 59			0.014 11			0.000 26			355			92		98	5	90	2
Q17T6-04^*			0.053 81			0.003 29			0.096 38			0.005 51			0.013 29			0.000 25			363			95		93	5	85	2
Q17T6-05			0.085 46			0.002 49			2.453 25			0.070 67			0.209 01			0.002 86			1 326			35		1 258	21	1 224	15
Q17T6-06			0.056 34			0.001 30			0.598 10			0.014 27			0.076 85			0.000 92			466			32		476	9	477	6
Q17T6-07^*			0.046 05			0.011 50			0.082 04			0.020 35			0.012 92			0.000 36						408		80	19	83	2
Q17T6-08			0.101 40			0.001 69			3.852 33			0.099 79			0.269 27			0.004 80			1 650			24		1 604	21	1 537	24
Q17T6-09^*			0.053 03			0.004 00			0.100 90			0.006 79			0.014 03			0.000 30			330			115		98	6	90	2
Q17T6-10			0.060 96			0.007 88			0.734 99			0.088 17			0.087 44			0.004 22			638			291		559	52	540	25
Q17T6-11			0.052 81			0.004 31			0.114 37			0.008 10			0.016 40			0.000 36			320			122		110	7	105	2
Q17T6-12^*			0.053 99			0.003 63			0.104 13			0.006 19			0.014 25			0.000 27			371			99		101	6	91	2
Q17T6-13			0.063 07			0.001 47			0.872 24			0.022 43			0.099 43			0.001 13			711			35		637	12	611	7
Q17T6-14			0.070 35			0.001 44			1.442 59			0.028 12			0.148 29			0.001 15			939			27		907	12	891	6
Q17T6-15			0.064 24			0.007 69			0.124 54			0.014 57			0.014 06			0.000 35			750			265		119	13	90	2
Q17T6-16^*			0.046 05			0.006 24			0.083 36			0.011 14			0.013 13			0.000 30						251		81	10	84	2
Q17T6-17			0.051 70			0.002 93			0.127 01			0.006 76			0.018 09			0.000 32			272			90		121	6	116	2
Q17T6-18^*			0.050 31			0.002 63			0.095 86			0.004 57			0.014 17			0.000 22			209			81		93	4	91	1
Q17T6-19			0.151 67			0.008 02			5.861 31			0.260 87			0.280 27			0.008 01			2 365			93		1 956	39	1 593	40
Q17T6-20			0.067 31			0.015 02			0.128 28			0.028 41			0.013 82			0.000 38			848			482		123	26	88	2
Q17T6-21			0.117 21			0.002 49			5.668 28			0.177 07			0.350 11			0.009 61			1 914			25		1 927	27	1 935	46
Q17T6-22^*			0.055 77			0.003 61			0.105 90			0.006 24			0.013 94			0.000 26			443			98		102	6	89	2
Q17T6-23			0.075 06			0.001 02			1.362 61			0.024 22			0.130 81			0.001 69			1 070			17		873	10	792	10
Q17T6-24^*			0.061 39			0.008 62			0.111 29			0.015 43			0.013 15			0.000 29			653			316		107	14	84	2
Q17T6-25			0.070 26			0.022 80			0.128 20			0.041 37			0.013 23			0.000 46			936			670		122	37	85	3
Q17T6-26			0.054 08			0.004 48			0.171 14			0.013 83			0.022 95			0.000 42			374			190		160	12	146	3
Q17T6-27			0.052 31			0.001 87			0.199 82			0.007 55			0.027 60			0.000 33			299			65		185	6	175	2
Q17T6-28^*			0.053 54			0.003 46			0.099 09			0.005 63			0.013 95			0.000 24			352			98		96	5	89	2
Q17T6-29^*			0.046 05			0.004 48			0.087 30			0.008 31			0.013 75			0.000 28						204		85	8	88	2
Q17T6-30			0.060 84			0.018 02			0.306 06			0.090 34			0.036 48			0.000 93			634			585		271	70	231	6
Q17T6-31			0.103 91			0.002 13			3.805 46			0.078 32			0.265 68			0.002 93			1 695			22		1 594	17	1 519	15
Q17T6-32^*			0.051 87			0.003 58			0.097 24			0.006 09			0.013 82			0.000 24			280			112		94	6	89	2
Q17T6-33			0.074 94			0.000 97			1.327 65			0.020 08			0.127 96			0.001 28			1 067			15		858	9	776	7
Q17T6-34			0.049 30			0.023 79			0.096 37			0.046 34			0.014 18			0.000 58			162			854		93	43	91	4
Q17T6-35^*			0.046 05			0.007 27			0.089 03			0.013 95			0.014 02			0.000 27						281		87	13	90	2
Q17T6-36			0.072 63			0.001 06			1.539 96			0.022 48			0.153 34			0.001 15			1 004			18		946	9	920	6
Q17T6-37			0.053 01			0.003 12			0.151 64			0.008 66			0.020 83			0.000 71			329			71		143	8	133	4
Q17T6-38			0.086 63			0.001 44			1.452 01			0.040 67			0.119 77			0.002 35			1 352			27		911	17	729	14
Q17T6-39^*			0.051 50			0.005 83			0.099 74			0.011 03			0.014 05			0.000 34			263			255		97	10	90	2
Q17T6-40^*			0.051 61			0.003 75			0.096 70			0.006 55			0.013 90			0.000 25			268			122		94	6	89	2
Q17T6-41^*			0.056 10			0.003 67			0.102 69			0.005 94			0.013 68			0.000 27			456			93		99	5	88	2
Q17T6-42^*			0.046 05			0.005 96			0.081 80			0.010 48			0.012 88			0.000 24						242		80	10	83	2
Q17T6-43^*			0.052 76			0.003 26			0.097 66			0.005 68			0.013 51			0.000 24			319			99		95	5	86	2
Q17T6-44			0.070 47			0.004 84			0.133 05			0.008 34			0.014 45			0.000 38			942			85		127	7	93	2
Q17T6-45			0.065 64			0.002 10			0.959 03			0.030 82			0.106 18			0.001 27			795			47		683	16	651	7
Q17T6-46			0.075 57			0.001 42			1.824 11			0.033 76			0.174 64			0.001 49			1 084			23		1 054	12	1 038	8
闪长玢岩(DCT4)
DCT4-01			0.051 50			0.005 70			0.299 46			0.032 83			0.042 16			0.000 97			263			205		266	26	266	6
DCT4-02			0.077 21			0.002 14			2.172 49			0.061 66			0.204 04			0.003 31			1 127			32		1 172	20	1 197	18
DCT4-03			0.060 69			0.001 38			0.824 55			0.019 69			0.098 53			0.001 53			628			26		611	11	606	9
DCT4-04^*			0.047 89			0.008 63			0.091 57			0.016 32			0.013 86			0.000 44			94			283		89	15	89	3
DCT4-05			0.049 87			0.001 95			0.212 64			0.008 29			0.030 92			0.000 53			189			59		196	7	196	3
DCT4-06			0.056 64			0.003 42			0.608 28			0.035 65			0.077 87			0.001 81			478			88		482	23	483	11
DCT4-07			0.049 30			0.004 47			0.175 43			0.015 77			0.025 80			0.000 54			162			163		164	14	164	3
DCT4-08			0.068 74			0.001 49			1.330 24			0.030 48			0.140 33			0.002 16			891			24		859	13	847	12
DCT4-09			0.067 09			0.002 20			1.311 19			0.042 88			0.141 73			0.002 50			841			39		851	19	854	14
DCT4-10			0.109 87			0.002 75			4.880 26			0.125 77			0.322 12			0.005 33			1 797			24		1 799	22	1 800	26
DCT4-11^*			0.047 74			0.008 57			0.091 95			0.016 39			0.013 97			0.000 39			86			287		89	15	89	2
DCT4-12			0.048 12			0.004 67			0.106 13			0.010 16			0.015 99			0.000 38			105			169		102	9	102	2
DCT4-13			0.059 83			0.002 07			0.816 52			0.028 45			0.098 97			0.001 67			597			47		606	16	608	10
DCT4-14^*			0.047 75			0.005 81			0.094 49			0.011 39			0.014 35			0.000 34			87			219		92	11	92	2
DCT4-15^*			0.047 81			0.007 04			0.084 99			0.012 26			0.012 89			0.000 44			90			242		83	11	83	3
DCT4-16			0.048 59			0.001 92			0.130 15			0.005 17			0.019 43			0.000 32			128			62		124	5	124	2
DCT4-17^*			0.047 98			0.005 07			0.097 19			0.010 13			0.014 69			0.000 37			98			185		94	9	94	2
DCT4-18			0.114 08			0.002 36			5.193 85			0.113 81			0.330 14			0.005 17			1 865			19		1 852	19	1 839	25
DCT4-19			0.050 74			0.002 48			0.240 30			0.011 55			0.034 34			0.000 66			229			75		219	9	218	4
DCT4-20			0.048 75			0.003 27			0.137 05			0.009 06			0.020 39			0.000 42			136			110		130	8	130	3
DCT4-21			0.137 78			0.002 87			7.739 08			0.170 53			0.407 33			0.006 45			2 199			18		2 201	20	2 203	30
DCT4-22			0.097 07			0.002 63			3.654 39			0.100 82			0.272 99			0.004 58			1 569			28		1 561	22	1 556	23
DCT4-23			0.052 62			0.002 22			0.348 12			0.014 56			0.047 98			0.000 87			312			62		303	11	302	5
DCT4-24			0.108 09			0.003 02			4.321 18			0.120 93			0.289 89			0.005 15			1 767			27		1 697	23	1 641	26
DCT4-25			0.049 06			0.003 27			0.154 58			0.010 13			0.022 85			0.000 48			151			109		146	9	146	3
英安岩(DCT14)
DCT14-01			0.060 92			0.001 75			0.572 44			0.016 52			0.068 13			0.001 03			636			37		460	11	425	6
DCT14-02			0.075 80			0.002 18			1.867 56			0.054 34			0.178 65			0.002 72			1 090			34		1 070	19	1 060	15
DCT14-03			0.080 57			0.001 50			2.173 99			0.043 06			0.195 66			0.002 74			1 211			19		1 173	14	1 152	15
DCT14-04			0.073 85			0.002 63			1.567 19			0.050 70			0.153 90			0.002 27			1 037			74		957	20	923	13
DCT14-05			0.060 90			0.002 07			0.471 41			0.016 03			0.056 13			0.000 88			636			46		392	11	352	5
DCT14-06			0.048 44			0.003 07			0.127 40			0.008 00			0.019 07			0.000 34			121			108		122	7	122	2
DCT14-07			0.056 85			0.001 22			0.618 41			0.013 75			0.078 88			0.001 12			486			26		489	9	489	7
DCT14-08			0.079 12			0.001 82			2.127 40			0.050 43			0.194 98			0.002 85			1 175			25		1 158	16	1 148	15
DCT14-09			0.086 41			0.003 81			2.318 28			0.095 85			0.194 58			0.002 99			1 347			87		1 218	29	1 146	16
DCT14-10			0.095 12			0.001 64			3.551 52			0.066 05			0.270 73			0.003 74			1 530			17		1 539	15	1 545	19
DCT14-11^*			0.047 70			0.005 08			0.093 63			0.009 91			0.014 23			0.000 27			84			198		91	9	91	2
DCT14-12^*			0.047 89			0.004 09			0.090 90			0.007 70			0.013 76			0.000 26			94			153		88	7	88	2
DCT14-13			0.058 59			0.002 32			0.668 01			0.026 44			0.082 68			0.001 30			552			59		520	16	512	8
DCT14-14			0.079 80			0.001 65			2.169 72			0.046 62			0.197 17			0.002 84			1 192			21		1 171	15	1 160	15
DCT14-15			0.097 53			0.002 19			3.359 07			0.077 57			0.249 73			0.003 73			1 577			22		1 495	18	1 437	19
DCT14-16			0.123 59			0.002 37			5.742 47			0.116 12			0.336 92			0.004 83			2 009			17		1 938	17	1 872	23
DCT14-17^*			0.057 25			0.003 80			0.108 45			0.007 11			0.013 74			0.000 26			501			111		105	7	88	2
DCT14-18^*			0.047 62			0.002 19			0.090 86			0.004 14			0.013 84			0.000 23			80			71		88	4	89	1
DCT14-19^*			0.047 76			0.003 33			0.087 48			0.006 03			0.013 28			0.000 24			87			118		85	6	85	2
DCT14-20^*			0.047 75			0.003 52			0.092 30			0.006 73			0.014 02			0.000 27			87			125		90	6	90	2
DCT14-21			0.062 74			0.001 32			0.788 15			0.017 27			0.091 10			0.001 30			699			24		590	10	562	8
DCT14-22^*			0.048 14			0.003 75			0.100 09			0.007 69			0.015 08			0.000 30			106			134		97	7	96	2
DCT14-23			0.054 66			0.001 20			0.497 81			0.011 37			0.066 03			0.000 94			398			27		410	8	412	6
DCT14-24^*			0.058 44			0.005 59			0.114 23			0.010 82			0.014 17			0.000 30			546			172		110	10	91	2
DCT14-25			0.057 35			0.001 56			0.640 23			0.017 52			0.080 95			0.001 23			505			34		502	11	502	7
英安岩(18T22)
18T22-01^*		0.047 67			0.003 12			0.089 03			0.005 86			0.013 57			0.000 37			83			96		87		5	87	2
18T22-02		0.094 90			0.002 25			2.111 77			0.057 54			0.161 74			0.004 04			1 526			23		1 153		19	966	22
18T22-03^*		0.051 03			0.003 75			0.094 54			0.006 98			0.013 47			0.000 37			242			119		92		6	86	2
18T22-04		0.057 35			0.002 03			0.642 69			0.024 12			0.081 46			0.002 08			505			41		504		15	505	12
18T22-05		0.062 32			0.003 26			0.111 43			0.005 92			0.013 00			0.000 35			685			68		107		5	83	2
18T22-06^*		0.048 33			0.002 39			0.088 24			0.004 42			0.013 27			0.000 36			115			67		86		4	85	2
18T22-07		0.049 33			0.002 65			0.122 79			0.006 62			0.018 10			0.000 51			164			74		118		6	116	3
18T22-08^*		0.047 32			0.002 64			0.088 43			0.004 98			0.013 59			0.000 37			65			75		86		5	87	2
18T22-09		0.050 40			0.005 70			0.107 70			0.012 18			0.015 53			0.000 44			213			202		104		11	99	3
18T22-10		0.071 56			0.001 52			1.350 51			0.034 30			0.137 21			0.003 36			973			23		868		15	829	19
18T22-11		0.072 44			0.001 67			1.646 21			0.044 24			0.165 21			0.004 08			998			24		988		17	986	23
18T22-12		0.107 47			0.002 31			2.358 97			0.060 34			0.159 58			0.003 92			1 757			21		1 230		18	954	22
18T22-13		0.070 61			0.002 67			0.129 88			0.005 09			0.013 37			0.000 35			946			41		124		5	86	2
18T22-14		0.056 20			0.003 04			0.106 70			0.005 84			0.013 80			0.000 37			460			74		103		5	88	2
18T22-15		0.077 71			0.002 55			2.016 77			0.070 62			0.188 65			0.004 88			1 139			33		1 121		24	1 114	26
18T22-16^*		0.048 40			0.003 70			0.086 96			0.006 68			0.013 06			0.000 36			119			121		85		6	84	2
18T22-17^*		0.048 47			0.002 59			0.089 15			0.004 84			0.013 37			0.000 36			122			75		87		5	86	2
18T22-18		0.055 33			0.001 52			0.440 31			0.013 45			0.057 84			0.001 44			426			31		370		9	362	9
18T22-19		0.111 77			0.002 39			3.970 70			0.101 40			0.258 17			0.006 32			1 828			21		1 628		21	1 480	32
18T22-20		0.116 01			0.002 42			3.779 66			0.095 15			0.236 75			0.005 78			1 896			20		1 588		20	1 370	30
18T22-21^*		0.047 13			0.003 39			0.086 61			0.006 26			0.013 35			0.000 36			56			109		84		6	85	2
18T22-22		0.124 69			0.002 72			1.992 87			0.051 47			0.116 09			0.002 85			2 024			21		1 113		17	708	16
18T22-23^*		0.048 03			0.002 62			0.088 05			0.004 87			0.013 32			0.000 36			101			77		86		5	85	2
18T22-24		0.068 49			0.003 44			0.123 14			0.006 30			0.013 06			0.000 35			883			62		118		6	84	2
18T22-25		0.090 94			0.001 95			2.163 15			0.055 38			0.172 70			0.004 22			1 445			22		1 169		18	1 027	23
18T22-26		0.046 05			0.007 40			0.073 92			0.011 66			0.011 64			0.000 36						283		72		11	75	2
18T22-27		0.049 68			0.001 48			0.126 80			0.004 12			0.018 52			0.000 46			180			35		121		4	118	3
18T22-28^*		0.047 50			0.002 90			0.088 80			0.005 50			0.013 56			0.000 36			74			89		86		5	87	2
18T22-29^*		0.047 45			0.002 27			0.086 60			0.004 20			0.013 24			0.000 36			72			61		84		4	85	2
18T22-30		0.058 40			0.002 90			0.665 14			0.033 94			0.082 61			0.002 13			545			67		518		21	512	13
18T22-31		0.190 64			0.003 91			8.684 80			0.216 06			0.330 30			0.008 04			2 748			19		2 305		23	1 840	39
18T22-32		0.075 97			0.003 16			0.137 21			0.005 87			0.013 09			0.000 34			1 094			46		131		5	84	2
18T22-33		0.094 20			0.002 62			2.445 14			0.074 91			0.188 12			0.004 78			1 512			26		1 256		22	1 111	26
18T22-34		0.062 19			0.001 52			0.955 60			0.026 72			0.111 34			0.002 75			681			27		681		14	681	16
18T22-35		0.048 55			0.001 50			0.158 89			0.005 32			0.023 71			0.000 59			126			37		150		5	151	4
英安岩(DT25)
DT25-01		0.048 87			0.001 16			0.148 54			0.003 46			0.022 04			0.000 29			142			31		141		3	141	2
DT25-02		0.177 35			0.001 59			7.907 43			0.072 28			0.323 32			0.003 94			2 628			10		2 221		8	1 806	19
DT25-03		0.057 59			0.000 63			0.656 38			0.007 16			0.082 65			0.001 01			514			12		512		4	512	6
DT25-04		0.079 79			0.001 07			2.236 04			0.029 56			0.203 22			0.002 58			1 192			12		1 192		9	1 193	14
DT25-05		0.048 66			0.001 19			0.139 52			0.003 33			0.020 79			0.000 28			131			32		133		3	133	2
DT25-06		0.048 90			0.002 50			0.085 11			0.004 26			0.012 62			0.000 20			143			85		83		4	81	1
DT25-07		0.076 70			0.001 07			1.989 82			0.027 02			0.188 13			0.002 42			1 113			12		1 112		9	1 111	13
DT25-08^*		0.048 31			0.004 88			0.096 94			0.009 70			0.014 55			0.000 27			114			189		94		9	93	2
DT25-09^*		0.061 73			0.019 66			0.118 41			0.037 53			0.013 91			0.000 43			665			629		114		34	89	3
DT25-10		0.164 97			0.003 08			10.553 73			0.143 08			0.463 99			0.005 97			2 507			32		2 485		13	2 457	26
DT25-11		0.048 35			0.000 96			0.122 66			0.002 40			0.018 40			0.000 24			116			23		117		2	118	2
DT25-12		0.048 38			0.004 07			0.121 03			0.010 08			0.018 14			0.000 31			118			154		116		9	116	2
DT25-13		0.081 55			0.002 43			0.289 72			0.008 28			0.025 76			0.000 38			1 235			33		258		7	164	2
英安岩(DT25)
DT25-14	0.085 03			0.002 41			1.342 28			0.033 49			0.114 50			0.001 53			1 316			56			864		15	699	9
DT25-15	0.048 11			0.005 23			0.105 76			0.011 37			0.015 94			0.000 33			105			201			102		10	102	2
DT25-16	0.048 60			0.002 65			0.131 55			0.007 08			0.019 63			0.000 30			129			94			125		6	125	2
DT25-17	0.130 75			0.002 27			5.254 47			0.063 84			0.291 47			0.003 60			2 108			31			1 861		10	1 649	18
DT25-18	0.068 30			0.002 13			1.428 73			0.040 12			0.151 70			0.002 03			878			66			901		17	911	11
DT25-19	0.048 16			0.003 66			0.104 75			0.007 88			0.015 77			0.000 26			107			136			101		7	101	2
DT25-20	0.048 39			0.004 47			0.124 53			0.011 40			0.018 66			0.000 33			118			171			119		10	119	2
DT25-21	0.099 28			0.001 84			3.885 73			0.071 81			0.283 80			0.003 55			1 611			17			1 611		15	1 610	18
DT25-22	0.062 03			0.000 98			0.810 57			0.012 96			0.094 75			0.001 11			675			16			603		7	584	7
DT25-23^*	0.047 84			0.002 92			0.090 88			0.005 44			0.013 78			0.000 23			91			102			88		5	88	1
DT25-24	0.166 84			0.002 45			10.576 14			0.158 97			0.459 66			0.005 41			2 526			12			2 487		14	2 438	24
DT25-25	0.078 97			0.001 42			1.460 38			0.026 25			0.134 09			0.001 63			1 171			18			914		11	811	9
DT25-26	0.080 30			0.004 04			0.180 83			0.008 86			0.016 33			0.000 27			1 204			70			169		8	104	2
DT25-27	0.191 08			0.002 88			13.051 84			0.200 13			0.495 29			0.005 93			2 751			12			2 683		14	2 594	26
DT25-28	0.075 52			0.003 09			0.242 91			0.009 70			0.023 32			0.000 36			1 082			55			221		8	149	2
DT25-29	0.117 49			0.001 84			4.628 89			0.073 32			0.285 68			0.003 41			1 918			13			1 754		13	1 620	17
DT25-30	0.129 41			0.002 55			6.695 57			0.132 65			0.375 17			0.004 51			2 090			19			2 072		18	2 054	21
DT25-31	0.053 10			0.002 96			0.115 68			0.006 35			0.015 80			0.000 24			333			97			111		6	101	2
DT25-32^*	0.050 10			0.002 81			0.098 17			0.005 43			0.014 21			0.000 22			200			99			95		5	91	1
DT25-33	0.078 14			0.001 95			1.841 50			0.044 94			0.170 90			0.002 31			1 150			28			1 060		16	1 017	13
DT25-34	0.075 99			0.003 31			0.272 98			0.011 46			0.026 05			0.000 44			1 095			57			245		9	166	3
DT25-35	0.104 12			0.001 80			2.593 33			0.044 84			0.180 60			0.002 21			1 699			16			1 299		13	1 070	12
DT25-36	0.102 44			0.001 64			3.816 23			0.061 79			0.270 14			0.003 23			1 669			14			1 596		13	1 542	16
DT25-37	0.053 91			0.002 91			0.131 60			0.007 01			0.017 70			0.000 27			367			93			126		6	113	2
DT25-38	0.109 07			0.001 73			4.773 25			0.076 98			0.317 34			0.003 82			1 784			14			1 780		14	1 777	19
DT25-39^*	0.052 84			0.002 53			0.107 09			0.005 05			0.014 69			0.000 22			322			80			103		5	94	1
DT25-40^*	0.048 11			0.003 83			0.100 60			0.007 90			0.015 16			0.000 27			105			141			97		7	97	2
DT25-41	0.067 16			0.001 45			1.356 37			0.029 19			0.146 44			0.001 82			843			25			870		13	881	10
DT25-42	0.075 92			0.001 73			1.127 81			0.025 30			0.107 72			0.001 40			1 093			25			767		12	659	8
DT25-43	0.079 90			0.001 59			2.052 75			0.040 49			0.186 30			0.002 35			1 195			20			1 133		13	1 101	13
DT25-44	0.078 07			0.001 59			1.728 85			0.034 67			0.160 58			0.002 04			1 149			21			1 019		13	960	11
DT25-45^*	0.047 75			0.002 29			0.088 60			0.004 15			0.013 45			0.000 21			87			76			86		4	86	1
DT25-46^*	0.047 80			0.002 75			0.094 25			0.005 37			0.014 30			0.000 22			89			98			91		5	92	1
DT25-47	0.107 91			0.001 94			4.665 93			0.083 71			0.313 55			0.003 91			1 764			16			1 761		15	1 758	19
DT25-48	0.049 08			0.002 44			0.169 20			0.008 25			0.025 00			0.000 38			152			84			159		7	159	2
DT25-49	0.052 28			0.001 73			0.340 95			0.011 11			0.047 29			0.000 63			298			50			298		8	298	4
DT25-50^*	0.047 77			0.002 56			0.091 86			0.004 84			0.013 94			0.000 22			88			88			89		5	89	1
DT25-51	0.058 85			0.001 71			0.594 23			0.016 99			0.073 22			0.000 99			562			39			474		11	456	6
DT25-52	0.048 37			0.001 88			0.124 70			0.004 76			0.018 70			0.000 27			117			62			119		4	119	2
DT25-53	0.048 67			0.001 65			0.142 33			0.004 72			0.021 20			0.000 30			132			51			135		4	135	2
DT25-54	0.048 05			0.002 39			0.102 86			0.005 02			0.015 52			0.000 24			102			81			99		5	99	2
DT25-55	0.058 12			0.001 14			0.694 65			0.013 51			0.086 67			0.001 08			534			22			536		8	536	6
DT25-56^*	0.048 46			0.002 49			0.096 88			0.004 90			0.014 50			0.000 23			122			86			94		5	93	1
DT25-57	0.048 29			0.001 38			0.120 89			0.003 38			0.018 15			0.000 24			114			41			116		3	116	2
DT25-58	0.048 74			0.002 13			0.141 96			0.006 11			0.021 12			0.000 30			135			74			135		5	135	2
DT25-59	0.054 31			0.001 94			0.460 95			0.016 06			0.061 55			0.000 91			384			52			385		11	385	6
DT25-60	0.060 10			0.001 79			0.817 93			0.023 73			0.098 69			0.001 40			607			38			607		13	607	8
DT25-61	0.051 62			0.005 92			0.187 98			0.021 30			0.026 41			0.000 56			269			217			175		18	168	4

Table 1 LA-ICP-MS zircon isotopic U-Pb analyses for diorite porphyrites

样号及测点			同位素比值及误差																		年龄及误差/Ma
样号及测点			²⁰⁷Pb/²⁰⁶Pb			1σ			²⁰⁷Pb/²³⁵U			1σ			²⁰⁶Pb/²³⁸U			1σ			²⁰⁷Pb/²⁰⁶Pb			1σ		²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
闪长玢岩(Q17T6)
Q17T6-01			0.048 46			0.001 72			0.139 64			0.004 99			0.020 80			0.000 23			122			63		133	4	133	1
Q17T6-02			0.049 44			0.002 17			0.162 37			0.006 74			0.023 88			0.000 28			169			75		153	6	152	2
Q17T6-03^*			0.053 62			0.003 48			0.100 96			0.005 59			0.014 11			0.000 26			355			92		98	5	90	2
Q17T6-04^*			0.053 81			0.003 29			0.096 38			0.005 51			0.013 29			0.000 25			363			95		93	5	85	2
Q17T6-05			0.085 46			0.002 49			2.453 25			0.070 67			0.209 01			0.002 86			1 326			35		1 258	21	1 224	15
Q17T6-06			0.056 34			0.001 30			0.598 10			0.014 27			0.076 85			0.000 92			466			32		476	9	477	6
Q17T6-07^*			0.046 05			0.011 50			0.082 04			0.020 35			0.012 92			0.000 36						408		80	19	83	2
Q17T6-08			0.101 40			0.001 69			3.852 33			0.099 79			0.269 27			0.004 80			1 650			24		1 604	21	1 537	24
Q17T6-09^*			0.053 03			0.004 00			0.100 90			0.006 79			0.014 03			0.000 30			330			115		98	6	90	2
Q17T6-10			0.060 96			0.007 88			0.734 99			0.088 17			0.087 44			0.004 22			638			291		559	52	540	25
Q17T6-11			0.052 81			0.004 31			0.114 37			0.008 10			0.016 40			0.000 36			320			122		110	7	105	2
Q17T6-12^*			0.053 99			0.003 63			0.104 13			0.006 19			0.014 25			0.000 27			371			99		101	6	91	2
Q17T6-13			0.063 07			0.001 47			0.872 24			0.022 43			0.099 43			0.001 13			711			35		637	12	611	7
Q17T6-14			0.070 35			0.001 44			1.442 59			0.028 12			0.148 29			0.001 15			939			27		907	12	891	6
Q17T6-15			0.064 24			0.007 69			0.124 54			0.014 57			0.014 06			0.000 35			750			265		119	13	90	2
Q17T6-16^*			0.046 05			0.006 24			0.083 36			0.011 14			0.013 13			0.000 30						251		81	10	84	2
Q17T6-17			0.051 70			0.002 93			0.127 01			0.006 76			0.018 09			0.000 32			272			90		121	6	116	2
Q17T6-18^*			0.050 31			0.002 63			0.095 86			0.004 57			0.014 17			0.000 22			209			81		93	4	91	1
Q17T6-19			0.151 67			0.008 02			5.861 31			0.260 87			0.280 27			0.008 01			2 365			93		1 956	39	1 593	40
Q17T6-20			0.067 31			0.015 02			0.128 28			0.028 41			0.013 82			0.000 38			848			482		123	26	88	2
Q17T6-21			0.117 21			0.002 49			5.668 28			0.177 07			0.350 11			0.009 61			1 914			25		1 927	27	1 935	46
Q17T6-22^*			0.055 77			0.003 61			0.105 90			0.006 24			0.013 94			0.000 26			443			98		102	6	89	2
Q17T6-23			0.075 06			0.001 02			1.362 61			0.024 22			0.130 81			0.001 69			1 070			17		873	10	792	10
Q17T6-24^*			0.061 39			0.008 62			0.111 29			0.015 43			0.013 15			0.000 29			653			316		107	14	84	2
Q17T6-25			0.070 26			0.022 80			0.128 20			0.041 37			0.013 23			0.000 46			936			670		122	37	85	3
Q17T6-26			0.054 08			0.004 48			0.171 14			0.013 83			0.022 95			0.000 42			374			190		160	12	146	3
Q17T6-27			0.052 31			0.001 87			0.199 82			0.007 55			0.027 60			0.000 33			299			65		185	6	175	2
Q17T6-28^*			0.053 54			0.003 46			0.099 09			0.005 63			0.013 95			0.000 24			352			98		96	5	89	2
Q17T6-29^*			0.046 05			0.004 48			0.087 30			0.008 31			0.013 75			0.000 28						204		85	8	88	2
Q17T6-30			0.060 84			0.018 02			0.306 06			0.090 34			0.036 48			0.000 93			634			585		271	70	231	6
Q17T6-31			0.103 91			0.002 13			3.805 46			0.078 32			0.265 68			0.002 93			1 695			22		1 594	17	1 519	15
Q17T6-32^*			0.051 87			0.003 58			0.097 24			0.006 09			0.013 82			0.000 24			280			112		94	6	89	2
Q17T6-33			0.074 94			0.000 97			1.327 65			0.020 08			0.127 96			0.001 28			1 067			15		858	9	776	7
Q17T6-34			0.049 30			0.023 79			0.096 37			0.046 34			0.014 18			0.000 58			162			854		93	43	91	4
Q17T6-35^*			0.046 05			0.007 27			0.089 03			0.013 95			0.014 02			0.000 27						281		87	13	90	2
Q17T6-36			0.072 63			0.001 06			1.539 96			0.022 48			0.153 34			0.001 15			1 004			18		946	9	920	6
Q17T6-37			0.053 01			0.003 12			0.151 64			0.008 66			0.020 83			0.000 71			329			71		143	8	133	4
Q17T6-38			0.086 63			0.001 44			1.452 01			0.040 67			0.119 77			0.002 35			1 352			27		911	17	729	14
Q17T6-39^*			0.051 50			0.005 83			0.099 74			0.011 03			0.014 05			0.000 34			263			255		97	10	90	2
Q17T6-40^*			0.051 61			0.003 75			0.096 70			0.006 55			0.013 90			0.000 25			268			122		94	6	89	2
Q17T6-41^*			0.056 10			0.003 67			0.102 69			0.005 94			0.013 68			0.000 27			456			93		99	5	88	2
Q17T6-42^*			0.046 05			0.005 96			0.081 80			0.010 48			0.012 88			0.000 24						242		80	10	83	2
Q17T6-43^*			0.052 76			0.003 26			0.097 66			0.005 68			0.013 51			0.000 24			319			99		95	5	86	2
Q17T6-44			0.070 47			0.004 84			0.133 05			0.008 34			0.014 45			0.000 38			942			85		127	7	93	2
Q17T6-45			0.065 64			0.002 10			0.959 03			0.030 82			0.106 18			0.001 27			795			47		683	16	651	7
Q17T6-46			0.075 57			0.001 42			1.824 11			0.033 76			0.174 64			0.001 49			1 084			23		1 054	12	1 038	8
闪长玢岩(DCT4)
DCT4-01			0.051 50			0.005 70			0.299 46			0.032 83			0.042 16			0.000 97			263			205		266	26	266	6
DCT4-02			0.077 21			0.002 14			2.172 49			0.061 66			0.204 04			0.003 31			1 127			32		1 172	20	1 197	18
DCT4-03			0.060 69			0.001 38			0.824 55			0.019 69			0.098 53			0.001 53			628			26		611	11	606	9
DCT4-04^*			0.047 89			0.008 63			0.091 57			0.016 32			0.013 86			0.000 44			94			283		89	15	89	3
DCT4-05			0.049 87			0.001 95			0.212 64			0.008 29			0.030 92			0.000 53			189			59		196	7	196	3
DCT4-06			0.056 64			0.003 42			0.608 28			0.035 65			0.077 87			0.001 81			478			88		482	23	483	11
DCT4-07			0.049 30			0.004 47			0.175 43			0.015 77			0.025 80			0.000 54			162			163		164	14	164	3
DCT4-08			0.068 74			0.001 49			1.330 24			0.030 48			0.140 33			0.002 16			891			24		859	13	847	12
DCT4-09			0.067 09			0.002 20			1.311 19			0.042 88			0.141 73			0.002 50			841			39		851	19	854	14
DCT4-10			0.109 87			0.002 75			4.880 26			0.125 77			0.322 12			0.005 33			1 797			24		1 799	22	1 800	26
DCT4-11^*			0.047 74			0.008 57			0.091 95			0.016 39			0.013 97			0.000 39			86			287		89	15	89	2
DCT4-12			0.048 12			0.004 67			0.106 13			0.010 16			0.015 99			0.000 38			105			169		102	9	102	2
DCT4-13			0.059 83			0.002 07			0.816 52			0.028 45			0.098 97			0.001 67			597			47		606	16	608	10
DCT4-14^*			0.047 75			0.005 81			0.094 49			0.011 39			0.014 35			0.000 34			87			219		92	11	92	2
DCT4-15^*			0.047 81			0.007 04			0.084 99			0.012 26			0.012 89			0.000 44			90			242		83	11	83	3
DCT4-16			0.048 59			0.001 92			0.130 15			0.005 17			0.019 43			0.000 32			128			62		124	5	124	2
DCT4-17^*			0.047 98			0.005 07			0.097 19			0.010 13			0.014 69			0.000 37			98			185		94	9	94	2
DCT4-18			0.114 08			0.002 36			5.193 85			0.113 81			0.330 14			0.005 17			1 865			19		1 852	19	1 839	25
DCT4-19			0.050 74			0.002 48			0.240 30			0.011 55			0.034 34			0.000 66			229			75		219	9	218	4
DCT4-20			0.048 75			0.003 27			0.137 05			0.009 06			0.020 39			0.000 42			136			110		130	8	130	3
DCT4-21			0.137 78			0.002 87			7.739 08			0.170 53			0.407 33			0.006 45			2 199			18		2 201	20	2 203	30
DCT4-22			0.097 07			0.002 63			3.654 39			0.100 82			0.272 99			0.004 58			1 569			28		1 561	22	1 556	23
DCT4-23			0.052 62			0.002 22			0.348 12			0.014 56			0.047 98			0.000 87			312			62		303	11	302	5
DCT4-24			0.108 09			0.003 02			4.321 18			0.120 93			0.289 89			0.005 15			1 767			27		1 697	23	1 641	26
DCT4-25			0.049 06			0.003 27			0.154 58			0.010 13			0.022 85			0.000 48			151			109		146	9	146	3
英安岩(DCT14)
DCT14-01			0.060 92			0.001 75			0.572 44			0.016 52			0.068 13			0.001 03			636			37		460	11	425	6
DCT14-02			0.075 80			0.002 18			1.867 56			0.054 34			0.178 65			0.002 72			1 090			34		1 070	19	1 060	15
DCT14-03			0.080 57			0.001 50			2.173 99			0.043 06			0.195 66			0.002 74			1 211			19		1 173	14	1 152	15
DCT14-04			0.073 85			0.002 63			1.567 19			0.050 70			0.153 90			0.002 27			1 037			74		957	20	923	13
DCT14-05			0.060 90			0.002 07			0.471 41			0.016 03			0.056 13			0.000 88			636			46		392	11	352	5
DCT14-06			0.048 44			0.003 07			0.127 40			0.008 00			0.019 07			0.000 34			121			108		122	7	122	2
DCT14-07			0.056 85			0.001 22			0.618 41			0.013 75			0.078 88			0.001 12			486			26		489	9	489	7
DCT14-08			0.079 12			0.001 82			2.127 40			0.050 43			0.194 98			0.002 85			1 175			25		1 158	16	1 148	15
DCT14-09			0.086 41			0.003 81			2.318 28			0.095 85			0.194 58			0.002 99			1 347			87		1 218	29	1 146	16
DCT14-10			0.095 12			0.001 64			3.551 52			0.066 05			0.270 73			0.003 74			1 530			17		1 539	15	1 545	19
DCT14-11^*			0.047 70			0.005 08			0.093 63			0.009 91			0.014 23			0.000 27			84			198		91	9	91	2
DCT14-12^*			0.047 89			0.004 09			0.090 90			0.007 70			0.013 76			0.000 26			94			153		88	7	88	2
DCT14-13			0.058 59			0.002 32			0.668 01			0.026 44			0.082 68			0.001 30			552			59		520	16	512	8
DCT14-14			0.079 80			0.001 65			2.169 72			0.046 62			0.197 17			0.002 84			1 192			21		1 171	15	1 160	15
DCT14-15			0.097 53			0.002 19			3.359 07			0.077 57			0.249 73			0.003 73			1 577			22		1 495	18	1 437	19
DCT14-16			0.123 59			0.002 37			5.742 47			0.116 12			0.336 92			0.004 83			2 009			17		1 938	17	1 872	23
DCT14-17^*			0.057 25			0.003 80			0.108 45			0.007 11			0.013 74			0.000 26			501			111		105	7	88	2
DCT14-18^*			0.047 62			0.002 19			0.090 86			0.004 14			0.013 84			0.000 23			80			71		88	4	89	1
DCT14-19^*			0.047 76			0.003 33			0.087 48			0.006 03			0.013 28			0.000 24			87			118		85	6	85	2
DCT14-20^*			0.047 75			0.003 52			0.092 30			0.006 73			0.014 02			0.000 27			87			125		90	6	90	2
DCT14-21			0.062 74			0.001 32			0.788 15			0.017 27			0.091 10			0.001 30			699			24		590	10	562	8
DCT14-22^*			0.048 14			0.003 75			0.100 09			0.007 69			0.015 08			0.000 30			106			134		97	7	96	2
DCT14-23			0.054 66			0.001 20			0.497 81			0.011 37			0.066 03			0.000 94			398			27		410	8	412	6
DCT14-24^*			0.058 44			0.005 59			0.114 23			0.010 82			0.014 17			0.000 30			546			172		110	10	91	2
DCT14-25			0.057 35			0.001 56			0.640 23			0.017 52			0.080 95			0.001 23			505			34		502	11	502	7
英安岩(18T22)
18T22-01^*		0.047 67			0.003 12			0.089 03			0.005 86			0.013 57			0.000 37			83			96		87		5	87	2
18T22-02		0.094 90			0.002 25			2.111 77			0.057 54			0.161 74			0.004 04			1 526			23		1 153		19	966	22
18T22-03^*		0.051 03			0.003 75			0.094 54			0.006 98			0.013 47			0.000 37			242			119		92		6	86	2
18T22-04		0.057 35			0.002 03			0.642 69			0.024 12			0.081 46			0.002 08			505			41		504		15	505	12
18T22-05		0.062 32			0.003 26			0.111 43			0.005 92			0.013 00			0.000 35			685			68		107		5	83	2
18T22-06^*		0.048 33			0.002 39			0.088 24			0.004 42			0.013 27			0.000 36			115			67		86		4	85	2
18T22-07		0.049 33			0.002 65			0.122 79			0.006 62			0.018 10			0.000 51			164			74		118		6	116	3
18T22-08^*		0.047 32			0.002 64			0.088 43			0.004 98			0.013 59			0.000 37			65			75		86		5	87	2
18T22-09		0.050 40			0.005 70			0.107 70			0.012 18			0.015 53			0.000 44			213			202		104		11	99	3
18T22-10		0.071 56			0.001 52			1.350 51			0.034 30			0.137 21			0.003 36			973			23		868		15	829	19
18T22-11		0.072 44			0.001 67			1.646 21			0.044 24			0.165 21			0.004 08			998			24		988		17	986	23
18T22-12		0.107 47			0.002 31			2.358 97			0.060 34			0.159 58			0.003 92			1 757			21		1 230		18	954	22
18T22-13		0.070 61			0.002 67			0.129 88			0.005 09			0.013 37			0.000 35			946			41		124		5	86	2
18T22-14		0.056 20			0.003 04			0.106 70			0.005 84			0.013 80			0.000 37			460			74		103		5	88	2
18T22-15		0.077 71			0.002 55			2.016 77			0.070 62			0.188 65			0.004 88			1 139			33		1 121		24	1 114	26
18T22-16^*		0.048 40			0.003 70			0.086 96			0.006 68			0.013 06			0.000 36			119			121		85		6	84	2
18T22-17^*		0.048 47			0.002 59			0.089 15			0.004 84			0.013 37			0.000 36			122			75		87		5	86	2
18T22-18		0.055 33			0.001 52			0.440 31			0.013 45			0.057 84			0.001 44			426			31		370		9	362	9
18T22-19		0.111 77			0.002 39			3.970 70			0.101 40			0.258 17			0.006 32			1 828			21		1 628		21	1 480	32
18T22-20		0.116 01			0.002 42			3.779 66			0.095 15			0.236 75			0.005 78			1 896			20		1 588		20	1 370	30
18T22-21^*		0.047 13			0.003 39			0.086 61			0.006 26			0.013 35			0.000 36			56			109		84		6	85	2
18T22-22		0.124 69			0.002 72			1.992 87			0.051 47			0.116 09			0.002 85			2 024			21		1 113		17	708	16
18T22-23^*		0.048 03			0.002 62			0.088 05			0.004 87			0.013 32			0.000 36			101			77		86		5	85	2
18T22-24		0.068 49			0.003 44			0.123 14			0.006 30			0.013 06			0.000 35			883			62		118		6	84	2
18T22-25		0.090 94			0.001 95			2.163 15			0.055 38			0.172 70			0.004 22			1 445			22		1 169		18	1 027	23
18T22-26		0.046 05			0.007 40			0.073 92			0.011 66			0.011 64			0.000 36						283		72		11	75	2
18T22-27		0.049 68			0.001 48			0.126 80			0.004 12			0.018 52			0.000 46			180			35		121		4	118	3
18T22-28^*		0.047 50			0.002 90			0.088 80			0.005 50			0.013 56			0.000 36			74			89		86		5	87	2
18T22-29^*		0.047 45			0.002 27			0.086 60			0.004 20			0.013 24			0.000 36			72			61		84		4	85	2
18T22-30		0.058 40			0.002 90			0.665 14			0.033 94			0.082 61			0.002 13			545			67		518		21	512	13
18T22-31		0.190 64			0.003 91			8.684 80			0.216 06			0.330 30			0.008 04			2 748			19		2 305		23	1 840	39
18T22-32		0.075 97			0.003 16			0.137 21			0.005 87			0.013 09			0.000 34			1 094			46		131		5	84	2
18T22-33		0.094 20			0.002 62			2.445 14			0.074 91			0.188 12			0.004 78			1 512			26		1 256		22	1 111	26
18T22-34		0.062 19			0.001 52			0.955 60			0.026 72			0.111 34			0.002 75			681			27		681		14	681	16
18T22-35		0.048 55			0.001 50			0.158 89			0.005 32			0.023 71			0.000 59			126			37		150		5	151	4
英安岩(DT25)
DT25-01		0.048 87			0.001 16			0.148 54			0.003 46			0.022 04			0.000 29			142			31		141		3	141	2
DT25-02		0.177 35			0.001 59			7.907 43			0.072 28			0.323 32			0.003 94			2 628			10		2 221		8	1 806	19
DT25-03		0.057 59			0.000 63			0.656 38			0.007 16			0.082 65			0.001 01			514			12		512		4	512	6
DT25-04		0.079 79			0.001 07			2.236 04			0.029 56			0.203 22			0.002 58			1 192			12		1 192		9	1 193	14
DT25-05		0.048 66			0.001 19			0.139 52			0.003 33			0.020 79			0.000 28			131			32		133		3	133	2
DT25-06		0.048 90			0.002 50			0.085 11			0.004 26			0.012 62			0.000 20			143			85		83		4	81	1
DT25-07		0.076 70			0.001 07			1.989 82			0.027 02			0.188 13			0.002 42			1 113			12		1 112		9	1 111	13
DT25-08^*		0.048 31			0.004 88			0.096 94			0.009 70			0.014 55			0.000 27			114			189		94		9	93	2
DT25-09^*		0.061 73			0.019 66			0.118 41			0.037 53			0.013 91			0.000 43			665			629		114		34	89	3
DT25-10		0.164 97			0.003 08			10.553 73			0.143 08			0.463 99			0.005 97			2 507			32		2 485		13	2 457	26
DT25-11		0.048 35			0.000 96			0.122 66			0.002 40			0.018 40			0.000 24			116			23		117		2	118	2
DT25-12		0.048 38			0.004 07			0.121 03			0.010 08			0.018 14			0.000 31			118			154		116		9	116	2
DT25-13		0.081 55			0.002 43			0.289 72			0.008 28			0.025 76			0.000 38			1 235			33		258		7	164	2
英安岩(DT25)
DT25-14	0.085 03			0.002 41			1.342 28			0.033 49			0.114 50			0.001 53			1 316			56			864		15	699	9
DT25-15	0.048 11			0.005 23			0.105 76			0.011 37			0.015 94			0.000 33			105			201			102		10	102	2
DT25-16	0.048 60			0.002 65			0.131 55			0.007 08			0.019 63			0.000 30			129			94			125		6	125	2
DT25-17	0.130 75			0.002 27			5.254 47			0.063 84			0.291 47			0.003 60			2 108			31			1 861		10	1 649	18
DT25-18	0.068 30			0.002 13			1.428 73			0.040 12			0.151 70			0.002 03			878			66			901		17	911	11
DT25-19	0.048 16			0.003 66			0.104 75			0.007 88			0.015 77			0.000 26			107			136			101		7	101	2
DT25-20	0.048 39			0.004 47			0.124 53			0.011 40			0.018 66			0.000 33			118			171			119		10	119	2
DT25-21	0.099 28			0.001 84			3.885 73			0.071 81			0.283 80			0.003 55			1 611			17			1 611		15	1 610	18
DT25-22	0.062 03			0.000 98			0.810 57			0.012 96			0.094 75			0.001 11			675			16			603		7	584	7
DT25-23^*	0.047 84			0.002 92			0.090 88			0.005 44			0.013 78			0.000 23			91			102			88		5	88	1
DT25-24	0.166 84			0.002 45			10.576 14			0.158 97			0.459 66			0.005 41			2 526			12			2 487		14	2 438	24
DT25-25	0.078 97			0.001 42			1.460 38			0.026 25			0.134 09			0.001 63			1 171			18			914		11	811	9
DT25-26	0.080 30			0.004 04			0.180 83			0.008 86			0.016 33			0.000 27			1 204			70			169		8	104	2
DT25-27	0.191 08			0.002 88			13.051 84			0.200 13			0.495 29			0.005 93			2 751			12			2 683		14	2 594	26
DT25-28	0.075 52			0.003 09			0.242 91			0.009 70			0.023 32			0.000 36			1 082			55			221		8	149	2
DT25-29	0.117 49			0.001 84			4.628 89			0.073 32			0.285 68			0.003 41			1 918			13			1 754		13	1 620	17
DT25-30	0.129 41			0.002 55			6.695 57			0.132 65			0.375 17			0.004 51			2 090			19			2 072		18	2 054	21
DT25-31	0.053 10			0.002 96			0.115 68			0.006 35			0.015 80			0.000 24			333			97			111		6	101	2
DT25-32^*	0.050 10			0.002 81			0.098 17			0.005 43			0.014 21			0.000 22			200			99			95		5	91	1
DT25-33	0.078 14			0.001 95			1.841 50			0.044 94			0.170 90			0.002 31			1 150			28			1 060		16	1 017	13
DT25-34	0.075 99			0.003 31			0.272 98			0.011 46			0.026 05			0.000 44			1 095			57			245		9	166	3
DT25-35	0.104 12			0.001 80			2.593 33			0.044 84			0.180 60			0.002 21			1 699			16			1 299		13	1 070	12
DT25-36	0.102 44			0.001 64			3.816 23			0.061 79			0.270 14			0.003 23			1 669			14			1 596		13	1 542	16
DT25-37	0.053 91			0.002 91			0.131 60			0.007 01			0.017 70			0.000 27			367			93			126		6	113	2
DT25-38	0.109 07			0.001 73			4.773 25			0.076 98			0.317 34			0.003 82			1 784			14			1 780		14	1 777	19
DT25-39^*	0.052 84			0.002 53			0.107 09			0.005 05			0.014 69			0.000 22			322			80			103		5	94	1
DT25-40^*	0.048 11			0.003 83			0.100 60			0.007 90			0.015 16			0.000 27			105			141			97		7	97	2
DT25-41	0.067 16			0.001 45			1.356 37			0.029 19			0.146 44			0.001 82			843			25			870		13	881	10
DT25-42	0.075 92			0.001 73			1.127 81			0.025 30			0.107 72			0.001 40			1 093			25			767		12	659	8
DT25-43	0.079 90			0.001 59			2.052 75			0.040 49			0.186 30			0.002 35			1 195			20			1 133		13	1 101	13
DT25-44	0.078 07			0.001 59			1.728 85			0.034 67			0.160 58			0.002 04			1 149			21			1 019		13	960	11
DT25-45^*	0.047 75			0.002 29			0.088 60			0.004 15			0.013 45			0.000 21			87			76			86		4	86	1
DT25-46^*	0.047 80			0.002 75			0.094 25			0.005 37			0.014 30			0.000 22			89			98			91		5	92	1
DT25-47	0.107 91			0.001 94			4.665 93			0.083 71			0.313 55			0.003 91			1 764			16			1 761		15	1 758	19
DT25-48	0.049 08			0.002 44			0.169 20			0.008 25			0.025 00			0.000 38			152			84			159		7	159	2
DT25-49	0.052 28			0.001 73			0.340 95			0.011 11			0.047 29			0.000 63			298			50			298		8	298	4
DT25-50^*	0.047 77			0.002 56			0.091 86			0.004 84			0.013 94			0.000 22			88			88			89		5	89	1
DT25-51	0.058 85			0.001 71			0.594 23			0.016 99			0.073 22			0.000 99			562			39			474		11	456	6
DT25-52	0.048 37			0.001 88			0.124 70			0.004 76			0.018 70			0.000 27			117			62			119		4	119	2
DT25-53	0.048 67			0.001 65			0.142 33			0.004 72			0.021 20			0.000 30			132			51			135		4	135	2
DT25-54	0.048 05			0.002 39			0.102 86			0.005 02			0.015 52			0.000 24			102			81			99		5	99	2
DT25-55	0.058 12			0.001 14			0.694 65			0.013 51			0.086 67			0.001 08			534			22			536		8	536	6
DT25-56^*	0.048 46			0.002 49			0.096 88			0.004 90			0.014 50			0.000 23			122			86			94		5	93	1
DT25-57	0.048 29			0.001 38			0.120 89			0.003 38			0.018 15			0.000 24			114			41			116		3	116	2
DT25-58	0.048 74			0.002 13			0.141 96			0.006 11			0.021 12			0.000 30			135			74			135		5	135	2
DT25-59	0.054 31			0.001 94			0.460 95			0.016 06			0.061 55			0.000 91			384			52			385		11	385	6
DT25-60	0.060 10			0.001 79			0.817 93			0.023 73			0.098 69			0.001 40			607			38			607		13	607	8
DT25-61	0.051 62			0.005 92			0.187 98			0.021 30			0.026 41			0.000 56			269			217			175		18	168	4

Fig.3 Zircon U-Pb concordant diagrams and cathodoluminescence images for diorite porphyrites and dacites

Table 2 Major and trace element compositions of diorite porphyrites and andesites

岩石	样号	主量元素含量/%
岩石	样号	SiO₂				TiO₂				Al₂O₃				TFe₂O₃				MnO				MgO				CaO				Na₂O				K₂O				P₂O₅			LOI
闪长玢岩	T4H1	63.40				0.48				19.20				4.13				0.08				2.22				3.81				5.62				0.91				0.14			1.27
	T4H2	62.40				0.49				19.80				4.18				0.08				2.49				3.67				5.75				1.01				0.14			1.45
	T4H3	62.50				0.48				19.90				4.16				0.08				2.27				3.83				5.80				0.84				0.13			1.17
	T4H4	63.30				0.48				19.30				3.98				0.07				2.37				4.44				5.02				0.94				0.14			3.58
	T4H5	63.00				0.48				19.40				4.03				0.07				2.18				3.78				6.12				0.89				0.13			1.09
	T4H6	62.10				0.49				19.70				4.28				0.07				2.31				3.74				6.24				0.90				0.13			1.11
	T4H7	62.30				0.49				19.60				4.32				0.08				2.25				4.11				5.72				0.91				0.15			1.36
	T4H8	61.50				0.49				20.20				4.33				0.08				2.34				4.08				5.94				0.99				0.14			1.18
	T4H9	63.50				0.48				18.90				4.23				0.07				2.25				4.21				5.26				0.91				0.16			1.36
	T4H10	62.80				0.48				19.40				4.24				0.06				2.28				4.75				5.00				0.85				0.13			1.39
岩石	样号	微量元素含量/10^-6
岩石	样号	Li		Sc				V				Cr				Co				Ni				Cu				Zn				Ga				Rb				Sr		Y
闪长玢岩	T4H1	21.70		9.29				92.70				18.00				10.10				19.30				19.50				84.20				18.70				29.30				456.00		11.30
	T4H2	30.90		9.79				94.90				18.20				10.40				17.10				18.00				66.40				19.40				35.20				419.00		11.50
	T4H3	26.30		9.99				95.40				18.30				10.10				19.00				17.30				60.50				19.40				27.30				478.00		11.50
	T4H4	19.20		8.71				85.10				19.10				9.20				18.30				18.40				88.60				17.00				26.70				450.00		11.50
	T4H5	21.40		9.25				89.90				17.20				9.90				17.20				20.00				61.10				18.60				29.80				451.00		10.90
	T4H6	20.40		9.62				93.60				24.80				10.10				24.20				18.30				56.00				18.80				30.20				443.00		11.40
	T4H7	18.80		10.10				97.50				18.20				10.50				18.20				14.90				66.30				19.20				28.30				497.00		12.00
	T4H8	22.10		9.96				92.90				19.60				10.10				19.10				17.10				78.70				18.80				31.80				454.00		11.30
	T4H9	20.20		10.10				98.70				17.90				10.80				17.90				29.80				57.70				19.30				28.70				465.00		11.60
	T4H10	31.10		10.40				98.70				17.20				11.10				19.00				19.70				51.60				20.10				27.60				485.00		11.90
岩石	样号	微量元素含量/10^-6
岩石	样号	Zr		Nb				Cs				Ba				La				Ce				Pr				Nd				Sm				Eu				Gd		Tb
闪长玢岩	T4H1	78.00		3.68				1.71				152.00				7.28				15.70				2.10				8.89				2.04				0.64				2.06		0.31
	T4H2	79.70		3.91				4.32				171.00				7.54				16.30				2.14				9.15				2.11				0.68				2.10		0.32
	T4H3	75.20		3.69				2.23				153.00				7.38				15.80				2.10				9.00				2.07				0.67				2.09		0.31
	T4H4	80.50		3.11				1.91				149.00				8.04				17.50				2.29				9.64				2.22				0.70				2.25		0.35
	T4H5	77.30		3.47				1.83				142.00				7.36				15.50				2.03				8.67				1.99				0.63				1.98		0.29
	T4H6	76.90		3.59				1.62				143.00				7.32				15.80				2.08				8.86				2.07				0.64				2.09		0.31
	T4H7	80.00		3.91				2.25				152.00				8.04				16.50				2.22				9.42				2.17				0.68				2.18		0.32
	T4H8	76.40		3.52				1.63				163.00				7.32				15.60				2.09				8.92				2.06				0.64				2.06		0.31
	T4H9	82.10		3.86				1.71				157.00				7.15				15.70				2.11				9.03				2.11				0.66				2.12		0.32
	T4H10	83.20		3.86				1.29				156.00				7.54				16.30				2.15				9.20				2.14				0.68				2.18		0.32
岩石	样号	微量元素含量/10^-6
岩石	样号	Dy				Ho				Er				Tm				Yb				Lu				Hf				Ta				Pb				Th			U
闪长玢岩	T4H1	1.88				0.38				1.14				0.16				1.09				0.16				2.05				0.27				7.11				1.61			0.41
	T4H2	1.96				0.39				1.17				0.16				1.13				0.17				2.09				0.27				7.77				1.63			0.43
	T4H3	1.94				0.39				1.16				0.16				1.13				0.17				2.02				0.25				5.67				1.65			0.38
	T4H4	2.09				0.43				1.27				0.19				1.23				0.19				2.19				0.22				6.61				2.10			0.44
	T4H5	1.85				0.37				1.12				0.16				1.07				0.16				2.03				0.23				8.06				1.58			0.39
	T4H6	1.94				0.39				1.15				0.17				1.13				0.17				2.06				0.27				7.37				1.62			0.39
	T4H7	1.99				0.40				1.20				0.17				1.15				0.17				2.11				0.27				5.95				1.64			0.42
	T4H8	1.90				0.39				1.13				0.16				1.11				0.16				2.01				0.24				7.77				1.61			0.38
	T4H9	1.96				0.39				1.18				0.17				1.15				0.17				2.14				0.27				5.59				1.65			0.40
	T4H10	2.00				0.40				1.20				0.17				1.18				0.17				2.18				0.27				5.07				1.66			0.38
岩石	样号		主量元素含量/%
岩石	样号		SiO₂				TiO₂				Al₂O₃				TFe₂O₃				MnO				MgO				CaO				Na₂O				K₂O				P₂O₅		LOI
英安岩	T25H1		74.30				0.51				11.80				2.56				0.03				0.08				1.94				0.02				0.07				0.15		7.09
	T25H2		70.00				0.50				17.20				3.52				0.02				0.12				0.83				0.01				0.04				0.17		6.47
	T25H3		70.00				0.50				16.40				3.33				0.04				0.12				1.53				0.02				0.04				0.14		6.70
	T25H4		68.40				0.52				16.90				4.11				0.05				0.12				1.87				0.03				0.05				0.15		6.76
	T25H5		69.90				0.53				17.40				3.97				0.01				0.12				0.54				0.04				0.03				0.18		6.19
	T25H6		69.80				0.53				16.00				4.61				0.01				0.12				0.92				0.05				0.04				0.16		6.56
	T25H7		67.10				0.46				16.30				2.93				0.05				0.11				3.70				0.04				0.04				0.15		8.03
	T25H8		66.60				0.47				16.80				3.45				0.04				0.13				3.40				0.04				0.04				0.15		7.87
	T25H9		68.30				0.52				16.70				5.16				0.06				0.13				0.67				0.06				0.03				0.14		7.86
	T25H10		67.60				0.48				15.40				2.19				0.04				0.10				3.61				0.04				0.02				0.13		10.10
	T25H11		68.40				0.51				17.00				4.79				0.13				0.11				0.50				0.04				0.07				0.15		7.96
岩石	样号		微量元素含量/10^-6
岩石	样号		Li		Sc				V				Cr				Co				Ni				Cu				Zn				Ga				Rb			Sr		Y
英安岩	T25H1		32.50		5.18				68.20				14.60				18.00				38.20				24.50				33.90				17.70				2.33			24.30		9.03
	T25H2		65.60		8.89				98.50				18.20				11.80				20.10				26.00				43.60				23.60				1.65			29.20		12.50
	T25H3		90.50		10.29				94.00				19.10				5.00				15.00				27.00				39.00				22.90				1.50			30.40		13.80
	T25H4		82.50		9.79				92.60				16.10				6.30				15.60				25.40				46.90				21.30				1.75			29.00		11.90
	T25H5		48.30		9.05				91.70				16.10				7.60				16.10				24.00				49.60				20.90				1.29			23.10		10.90
	T25H6		78.30		7.72				96.40				16.20				7.00				16.10				24.90				62.00				21.20				1.55			32.10		10.40
	T25H7		110.00		9.78				86.10				18.00				5.10				12.70				21.60				36.40				21.80				1.60			105.00		12.40
	T25H8		101.00		10.04				83.50				15.50				7.70				14.80				21.90				49.40				20.70				1.35			96.70		11.60
	T25H9		39.80		9.29				101.00				18.70				6.30				16.00				20.60				46.40				18.50				1.39			36.40		12.60
	T25H10		51.50		9.15				87.10				17.90				5.20				11.80				14.50				25.70				17.90				1.06			57.20		12.40
	T25H11		30.00		9.97				98.30				17.50				10.50				18.90				23.20				55.30				18.80				3.15			45.80		14.20
岩石	样号		微量元素含量/10^-6
岩石	样号		Zr		Nb				Cs				Ba				La				Ce				Pr				Nd				Sm				Eu			Gd		Tb
英安岩	T25H1		82.60		3.85				0.73				26.20				6.61				16.50				1.93				8.07				1.86				0.44			1.97		0.28
	T25H2		94.90		4.60				0.83				44.40				9.38				21.00				2.67				11.10				2.53				0.63			2.64		0.38
	T25H3		92.30		4.33				0.58				61.70				10.00				21.10				2.81				11.50				2.60				0.71			2.73		0.39
	T25H4		88.70		4.15				0.57				65.70				8.67				18.80				2.47				10.20				2.32				0.62			2.42		0.34
	T25H5		97.90		4.11				0.75				26.90				7.73				18.60				2.31				9.75				2.26				0.56			2.39		0.34
	T25H6		91.00		4.23				0.63				18.10				8.76				20.70				2.35				9.60				2.13				0.58			2.26		0.32
	T25H7		88.10		3.96				0.83				68.00				9.50				20.60				2.61				10.70				2.47				0.68			2.55		0.36
	T25H8		80.10		3.77				0.73				45.10				9.02				19.40				2.47				10.20				2.30				0.65			2.42		0.35
	T25H9		92.90		4.17				0.52				102.00				8.82				18.90				2.57				10.80				2.56				0.68			2.60		0.39
	T25H10		92.90		4.67				0.70				21.40				9.43				20.60				2.62				10.90				2.45				0.72			2.49		0.38
	T25H11		91.40		4.23				1.83				168.00				10.60				21.00				3.09				13.00				3.04				0.86			3.12		0.47
岩石	样号		微量元素含量/10^-6
岩石	样号		Dy				Ho				Er				Tm				Yb				Lu				Hf				Ta				Pb				Th		U
英安岩	T25H1		1.82				0.35				1.05				0.13				0.99				0.13				2.12				0.22				6.38				1.13		0.52
	T25H2		2.37				0.47				1.36				0.17				1.26				0.17				2.35				0.25				3.62				1.65		0.60
	T25H3		2.49				0.51				1.47				0.19				1.40				0.19				2.30				0.25				3.09				1.61		0.51
	T25H4		2.18				0.44				1.29				0.17				1.21				0.16				2.20				0.24				3.46				1.48		0.46
	T25H5		2.18				0.43				1.27				0.16				1.18				0.16				2.47				0.29				3.46				1.56		0.60
	T25H6		2.09				0.42				1.22				0.16				1.18				0.16				2.26				0.23				3.31				1.40		0.54
	T25H7		2.36				0.48				1.41				0.19				1.36				0.18				2.26				0.23				5.25				1.55		0.57
	T25H8		2.27				0.46				1.34				0.18				1.31				0.18				2.09				0.23				5.04				1.48		0.60
	T25H9		2.38				0.48				1.40				0.20				1.34				0.21				2.35				0.26				3.21				2.24		0.69
	T25H10		2.30				0.48				1.37				0.20				1.31				0.20				2.34				0.34				6.94				2.30		0.63
	T25H11		2.78				0.56				1.59				0.22				1.47				0.23				2.39				0.28				4.61				2.35		0.62

Table 2 Major and trace element compositions of diorite porphyrites and andesites

岩石	样号	主量元素含量/%
岩石	样号	SiO₂				TiO₂				Al₂O₃				TFe₂O₃				MnO				MgO				CaO				Na₂O				K₂O				P₂O₅			LOI
闪长玢岩	T4H1	63.40				0.48				19.20				4.13				0.08				2.22				3.81				5.62				0.91				0.14			1.27
	T4H2	62.40				0.49				19.80				4.18				0.08				2.49				3.67				5.75				1.01				0.14			1.45
	T4H3	62.50				0.48				19.90				4.16				0.08				2.27				3.83				5.80				0.84				0.13			1.17
	T4H4	63.30				0.48				19.30				3.98				0.07				2.37				4.44				5.02				0.94				0.14			3.58
	T4H5	63.00				0.48				19.40				4.03				0.07				2.18				3.78				6.12				0.89				0.13			1.09
	T4H6	62.10				0.49				19.70				4.28				0.07				2.31				3.74				6.24				0.90				0.13			1.11
	T4H7	62.30				0.49				19.60				4.32				0.08				2.25				4.11				5.72				0.91				0.15			1.36
	T4H8	61.50				0.49				20.20				4.33				0.08				2.34				4.08				5.94				0.99				0.14			1.18
	T4H9	63.50				0.48				18.90				4.23				0.07				2.25				4.21				5.26				0.91				0.16			1.36
	T4H10	62.80				0.48				19.40				4.24				0.06				2.28				4.75				5.00				0.85				0.13			1.39
岩石	样号	微量元素含量/10^-6
岩石	样号	Li		Sc				V				Cr				Co				Ni				Cu				Zn				Ga				Rb				Sr		Y
闪长玢岩	T4H1	21.70		9.29				92.70				18.00				10.10				19.30				19.50				84.20				18.70				29.30				456.00		11.30
	T4H2	30.90		9.79				94.90				18.20				10.40				17.10				18.00				66.40				19.40				35.20				419.00		11.50
	T4H3	26.30		9.99				95.40				18.30				10.10				19.00				17.30				60.50				19.40				27.30				478.00		11.50
	T4H4	19.20		8.71				85.10				19.10				9.20				18.30				18.40				88.60				17.00				26.70				450.00		11.50
	T4H5	21.40		9.25				89.90				17.20				9.90				17.20				20.00				61.10				18.60				29.80				451.00		10.90
	T4H6	20.40		9.62				93.60				24.80				10.10				24.20				18.30				56.00				18.80				30.20				443.00		11.40
	T4H7	18.80		10.10				97.50				18.20				10.50				18.20				14.90				66.30				19.20				28.30				497.00		12.00
	T4H8	22.10		9.96				92.90				19.60				10.10				19.10				17.10				78.70				18.80				31.80				454.00		11.30
	T4H9	20.20		10.10				98.70				17.90				10.80				17.90				29.80				57.70				19.30				28.70				465.00		11.60
	T4H10	31.10		10.40				98.70				17.20				11.10				19.00				19.70				51.60				20.10				27.60				485.00		11.90
岩石	样号	微量元素含量/10^-6
岩石	样号	Zr		Nb				Cs				Ba				La				Ce				Pr				Nd				Sm				Eu				Gd		Tb
闪长玢岩	T4H1	78.00		3.68				1.71				152.00				7.28				15.70				2.10				8.89				2.04				0.64				2.06		0.31
	T4H2	79.70		3.91				4.32				171.00				7.54				16.30				2.14				9.15				2.11				0.68				2.10		0.32
	T4H3	75.20		3.69				2.23				153.00				7.38				15.80				2.10				9.00				2.07				0.67				2.09		0.31
	T4H4	80.50		3.11				1.91				149.00				8.04				17.50				2.29				9.64				2.22				0.70				2.25		0.35
	T4H5	77.30		3.47				1.83				142.00				7.36				15.50				2.03				8.67				1.99				0.63				1.98		0.29
	T4H6	76.90		3.59				1.62				143.00				7.32				15.80				2.08				8.86				2.07				0.64				2.09		0.31
	T4H7	80.00		3.91				2.25				152.00				8.04				16.50				2.22				9.42				2.17				0.68				2.18		0.32
	T4H8	76.40		3.52				1.63				163.00				7.32				15.60				2.09				8.92				2.06				0.64				2.06		0.31
	T4H9	82.10		3.86				1.71				157.00				7.15				15.70				2.11				9.03				2.11				0.66				2.12		0.32
	T4H10	83.20		3.86				1.29				156.00				7.54				16.30				2.15				9.20				2.14				0.68				2.18		0.32
岩石	样号	微量元素含量/10^-6
岩石	样号	Dy				Ho				Er				Tm				Yb				Lu				Hf				Ta				Pb				Th			U
闪长玢岩	T4H1	1.88				0.38				1.14				0.16				1.09				0.16				2.05				0.27				7.11				1.61			0.41
	T4H2	1.96				0.39				1.17				0.16				1.13				0.17				2.09				0.27				7.77				1.63			0.43
	T4H3	1.94				0.39				1.16				0.16				1.13				0.17				2.02				0.25				5.67				1.65			0.38
	T4H4	2.09				0.43				1.27				0.19				1.23				0.19				2.19				0.22				6.61				2.10			0.44
	T4H5	1.85				0.37				1.12				0.16				1.07				0.16				2.03				0.23				8.06				1.58			0.39
	T4H6	1.94				0.39				1.15				0.17				1.13				0.17				2.06				0.27				7.37				1.62			0.39
	T4H7	1.99				0.40				1.20				0.17				1.15				0.17				2.11				0.27				5.95				1.64			0.42
	T4H8	1.90				0.39				1.13				0.16				1.11				0.16				2.01				0.24				7.77				1.61			0.38
	T4H9	1.96				0.39				1.18				0.17				1.15				0.17				2.14				0.27				5.59				1.65			0.40
	T4H10	2.00				0.40				1.20				0.17				1.18				0.17				2.18				0.27				5.07				1.66			0.38
岩石	样号		主量元素含量/%
岩石	样号		SiO₂				TiO₂				Al₂O₃				TFe₂O₃				MnO				MgO				CaO				Na₂O				K₂O				P₂O₅		LOI
英安岩	T25H1		74.30				0.51				11.80				2.56				0.03				0.08				1.94				0.02				0.07				0.15		7.09
	T25H2		70.00				0.50				17.20				3.52				0.02				0.12				0.83				0.01				0.04				0.17		6.47
	T25H3		70.00				0.50				16.40				3.33				0.04				0.12				1.53				0.02				0.04				0.14		6.70
	T25H4		68.40				0.52				16.90				4.11				0.05				0.12				1.87				0.03				0.05				0.15		6.76
	T25H5		69.90				0.53				17.40				3.97				0.01				0.12				0.54				0.04				0.03				0.18		6.19
	T25H6		69.80				0.53				16.00				4.61				0.01				0.12				0.92				0.05				0.04				0.16		6.56
	T25H7		67.10				0.46				16.30				2.93				0.05				0.11				3.70				0.04				0.04				0.15		8.03
	T25H8		66.60				0.47				16.80				3.45				0.04				0.13				3.40				0.04				0.04				0.15		7.87
	T25H9		68.30				0.52				16.70				5.16				0.06				0.13				0.67				0.06				0.03				0.14		7.86
	T25H10		67.60				0.48				15.40				2.19				0.04				0.10				3.61				0.04				0.02				0.13		10.10
	T25H11		68.40				0.51				17.00				4.79				0.13				0.11				0.50				0.04				0.07				0.15		7.96
岩石	样号		微量元素含量/10^-6
岩石	样号		Li		Sc				V				Cr				Co				Ni				Cu				Zn				Ga				Rb			Sr		Y
英安岩	T25H1		32.50		5.18				68.20				14.60				18.00				38.20				24.50				33.90				17.70				2.33			24.30		9.03
	T25H2		65.60		8.89				98.50				18.20				11.80				20.10				26.00				43.60				23.60				1.65			29.20		12.50
	T25H3		90.50		10.29				94.00				19.10				5.00				15.00				27.00				39.00				22.90				1.50			30.40		13.80
	T25H4		82.50		9.79				92.60				16.10				6.30				15.60				25.40				46.90				21.30				1.75			29.00		11.90
	T25H5		48.30		9.05				91.70				16.10				7.60				16.10				24.00				49.60				20.90				1.29			23.10		10.90
	T25H6		78.30		7.72				96.40				16.20				7.00				16.10				24.90				62.00				21.20				1.55			32.10		10.40
	T25H7		110.00		9.78				86.10				18.00				5.10				12.70				21.60				36.40				21.80				1.60			105.00		12.40
	T25H8		101.00		10.04				83.50				15.50				7.70				14.80				21.90				49.40				20.70				1.35			96.70		11.60
	T25H9		39.80		9.29				101.00				18.70				6.30				16.00				20.60				46.40				18.50				1.39			36.40		12.60
	T25H10		51.50		9.15				87.10				17.90				5.20				11.80				14.50				25.70				17.90				1.06			57.20		12.40
	T25H11		30.00		9.97				98.30				17.50				10.50				18.90				23.20				55.30				18.80				3.15			45.80		14.20
岩石	样号		微量元素含量/10^-6
岩石	样号		Zr		Nb				Cs				Ba				La				Ce				Pr				Nd				Sm				Eu			Gd		Tb
英安岩	T25H1		82.60		3.85				0.73				26.20				6.61				16.50				1.93				8.07				1.86				0.44			1.97		0.28
	T25H2		94.90		4.60				0.83				44.40				9.38				21.00				2.67				11.10				2.53				0.63			2.64		0.38
	T25H3		92.30		4.33				0.58				61.70				10.00				21.10				2.81				11.50				2.60				0.71			2.73		0.39
	T25H4		88.70		4.15				0.57				65.70				8.67				18.80				2.47				10.20				2.32				0.62			2.42		0.34
	T25H5		97.90		4.11				0.75				26.90				7.73				18.60				2.31				9.75				2.26				0.56			2.39		0.34
	T25H6		91.00		4.23				0.63				18.10				8.76				20.70				2.35				9.60				2.13				0.58			2.26		0.32
	T25H7		88.10		3.96				0.83				68.00				9.50				20.60				2.61				10.70				2.47				0.68			2.55		0.36
	T25H8		80.10		3.77				0.73				45.10				9.02				19.40				2.47				10.20				2.30				0.65			2.42		0.35
	T25H9		92.90		4.17				0.52				102.00				8.82				18.90				2.57				10.80				2.56				0.68			2.60		0.39
	T25H10		92.90		4.67				0.70				21.40				9.43				20.60				2.62				10.90				2.45				0.72			2.49		0.38
	T25H11		91.40		4.23				1.83				168.00				10.60				21.00				3.09				13.00				3.04				0.86			3.12		0.47
岩石	样号		微量元素含量/10^-6
岩石	样号		Dy				Ho				Er				Tm				Yb				Lu				Hf				Ta				Pb				Th		U
英安岩	T25H1		1.82				0.35				1.05				0.13				0.99				0.13				2.12				0.22				6.38				1.13		0.52
	T25H2		2.37				0.47				1.36				0.17				1.26				0.17				2.35				0.25				3.62				1.65		0.60
	T25H3		2.49				0.51				1.47				0.19				1.40				0.19				2.30				0.25				3.09				1.61		0.51
	T25H4		2.18				0.44				1.29				0.17				1.21				0.16				2.20				0.24				3.46				1.48		0.46
	T25H5		2.18				0.43				1.27				0.16				1.18				0.16				2.47				0.29				3.46				1.56		0.60
	T25H6		2.09				0.42				1.22				0.16				1.18				0.16				2.26				0.23				3.31				1.40		0.54
	T25H7		2.36				0.48				1.41				0.19				1.36				0.18				2.26				0.23				5.25				1.55		0.57
	T25H8		2.27				0.46				1.34				0.18				1.31				0.18				2.09				0.23				5.04				1.48		0.60
	T25H9		2.38				0.48				1.40				0.20				1.34				0.21				2.35				0.26				3.21				2.24		0.69
	T25H10		2.30				0.48				1.37				0.20				1.31				0.20				2.34				0.34				6.94				2.30		0.63
	T25H11		2.78				0.56				1.59				0.22				1.47				0.23				2.39				0.28				4.61				2.35		0.62

Fig.4 Geochemical classification diagrams for diorite porphyrites and dacites. (a) Zr/Ti—Nb/Y diagram. (b) Th—Co diagram.(c) Sr/Y—Y diagram. (d) (La/Yb)N—YbN diagram.

Fig.5 Chondrite-normalized rare earth element patterns (a) and primitive mantle-normalized trace element patterns (b) (data for primitive mantle and chondrites can be found in reference [26])

Table 3 Whole-rock Sr-Nd isotope compositions of diorite porphyrites

样号	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	2σ	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	2σ	(⁸⁷Sr/ ⁸⁶Sr)_i	ε_Nd(0)	ε_Nd(t)	$T D M 1$ / Ma	$T D M 2$ / Ma	f_Sm/Nd
T4H1	0.186 110	0.705 044	0.000 004	0.138 654	0.512 603	0.000 011	0.704 806	-0.682 74	-0.016 08	1 110	890	-0.30
T4H2	0.242 974	0.704 959	0.000 004	0.139 380	0.512 591	0.000 013	0.704 648	-0.916 83	-0.258 56	1 146	910	-0.29
T4H3	0.165 026	0.705 016	0.000 006	0.139 182	0.512 592	0.000 019	0.704 805	-0.897 32	-0.236 76	1 141	908	-0.29

Table 3 Whole-rock Sr-Nd isotope compositions of diorite porphyrites

样号	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	2σ	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	2σ	(⁸⁷Sr/ ⁸⁶Sr)_i	ε_Nd(0)	ε_Nd(t)	$T D M 1$ / Ma	$T D M 2$ / Ma	f_Sm/Nd
T4H1	0.186 110	0.705 044	0.000 004	0.138 654	0.512 603	0.000 011	0.704 806	-0.682 74	-0.016 08	1 110	890	-0.30
T4H2	0.242 974	0.704 959	0.000 004	0.139 380	0.512 591	0.000 013	0.704 648	-0.916 83	-0.258 56	1 146	910	-0.29
T4H3	0.165 026	0.705 016	0.000 006	0.139 182	0.512 592	0.000 019	0.704 805	-0.897 32	-0.236 76	1 141	908	-0.29

Fig.6 Whole-rock Sr-Nd isotopes for the diorite porphyrite (data from Fig.4)

Table 4 Zircon Lu-Hf isotope compositions for diorite porphyrites anddacites

样号及测点	年龄/ Ma		¹⁷⁶Yb/ ¹⁷⁷Hf		1σ		¹⁷⁶Lu/ ¹⁷⁷Hf		1σ	¹⁷⁶Hf/ ¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	T_DM1/ Ma	$T D M 2$ / Ma	f_Lu/Hf
闪长玢岩(Q17T6)
01	133		0.029 41		0.000 15		0.000 64		0.000 00	0.282 50	0.000 01	-9.54	-6.68	1 051	1 611	-0.98
02	1 224		0.033 03		0.000 41		0.000 78		0.000 01	0.282 02	0.000 01	-26.64	-0.17	1 727	2 030	-0.98
03	85		0.040 03		0.000 23		0.001 21		0.000 01	0.282 96	0.000 01	6.78	8.58	411	602	-0.96
04	152		0.129 25		0.000 65		0.003 30		0.000 01	0.282 96	0.000 01	6.55	9.55	446	591	-0.90
05	90		0.067 39		0.000 76		0.001 75		0.000 01	0.283 00	0.000 01	8.15	10.00	361	513	-0.95
06	477		0.046 84		0.000 14		0.001 35		0.000 01	0.282 40	0.000 01	-13.2	-3.16	1 219	1 648	-0.96
07	1 537		0.020 65		0.000 31		0.000 58		0.000 01	0.281 64	0.000 01	-39.9	-6.38	2 230	2 655	-0.98
08	90		0.059 60		0.000 99		0.002 18		0.000 04	0.283 00	0.000 02	7.95	9.80	373	527	-0.93
09	90		0.045 90		0.000 16		0.001 39		0.000 01	0.282 89	0.000 02	4.05	16.96	524	775	-0.96
10	611		0.019 58		0.000 09		0.000 43		0.000 00	0.282 33	0.000 01	-15.60	-13.60	1 282	1 696	-0.99
11	91		0.032 21		0.000 49		0.000 89		0.000 01	0.283 01	0.000 01	8.45	27.70	341	490	-0.97
12	891		0.009 73		0.000 07		0.000 29		0.000 00	0.282 23	0.000 01	-19.20	-17.30	1 418	1 746	-0.99
13	90		0.022 78		0.000 07		0.000 65		0.000 00	0.283 06	0.000 01	10.00	11.80	275	388	-0.98
14	84		0.064 82		0.000 29		0.001 94		0.000 02	0.283 06	0.000 01	10.40	12.10	272	376	-0.94
15	116		0.034 64		0.000 65		0.000 86		0.000 02	0.282 64	0.000 01	-4.82	-2.34	870	1 323	-0.97
16	91		0.063 77		0.000 35		0.001 71		0.000 00	0.283 08	0.000 01	11.00	12.90	242	327	-0.95
17	1 935		0.031 10		0.000 16		0.000 80		0.000 00	0.281 60	0.000 01	-41.60	0.51	2 308	2 533	-0.98
18	89		0.072 04		0.000 60		0.002 16		0.000 02	0.282 94	0.000 01	5.86	7.69	460	662	-0.93
19	146		0.048 38		0.000 56		0.001 39		0.000 02	0.282 48	0.000 01	-10.50	-7.42	1 111	1 667	-0.96
20	792		0.043 54		0.000 32		0.001 10		0.000 01	0.282 26	0.000 01	-18.20	-1.31	1 408	1 772	-0.97
21	89		0.056 31		0.000 12		0.001 73		0.000 01	0.283 05	0.000 01	9.88	11.70	290	403	-0.95
22	175		0.088 31		0.000 79		0.002 69		0.000 02	0.282 92	0.000 01	5.37	8.90	487	650	-0.92
23	90		0.066 99		0.000 87		0.001 86		0.000 04	0.281 98	0.000 02	-27.90	-26.00	1 825	2 793	-0.94
24	729		0.072 52		0.000 86		0.002 57		0.000 04	0.283 06	0.000 02	10.30	25.10	281	45	-0.92
25	1 519		0.027 62		0.000 17		0.000 72		0.000 00	0.281 65	0.000 01	-39.50	-6.52	2 223	2 650	-0.98
26	89		0.066 16		0.000 33		0.002 16		0.000 01	0.282 94	0.000 01	5.96	7.79	456	656	-0.93
27	89		0.065 39		0.000 68		0.002 27		0.000 03	0.283 06	0.000 02	10.11	11.90	284	390	-0.93
28	920		0.058 38		0.000 46		0.001 37		0.000 01	0.282 41	0.000 01	-12.80	6.68	1 203	1 367	-0.96
29	90		0.031 52		0.000 25		0.001 09		0.000 01	0.282 94	0.000 03	5.81	7.72	449	661	-0.97
英安岩(DCT25)
01	119		0.053 86		0.002 19		0.001 30		0.000 05	0.282 86	0.000 02	3.07	5.58	562	820	-0.96
02	101		0.031 64		0.001 58		0.000 78		0.000 04	0.282 03	0.000 03	-26.30	-24.10	1 712	2 684	-0.98
03	125		0.076 27		0.001 28		0.001 82		0.000 05	0.282 77	0.000 02	0.03	2.62	695	1 013	-0.95
04	102		0.072 47		0.000 87		0.001 86		0.000 02	0.282 93	0.000 02	5.54	7.65	470	674	-0.94
05	116		0.033 68		0.000 27		0.000 93		0.000 01	0.282 67	0.000 02	-3.52	-1.05	820	1 240	-0.97
06	118		0.078 61		0.000 45		0.001 88		0.000 01	0.282 36	0.000 02	-14.40	-12.00	1 286	1 935	-0.94
07	93		0.090 63		0.003 60		0.002 89		0.000 15	0.283 03	0.000 03	8.99	10.90	337	462	-0.91
08	81		0.090 88		0.001 02		0.002 34		0.000 05	0.283 03	0.000 02	8.95	10.60	333	469	-0.93
09	1 610		0.036 66		0.001 90		0.000 85		0.000 04	0.282 02	0.000 03		8.39	1 725	1 794	-0.97
10	88		0.077 94		0.002 40		0.001 94		0.000 07	0.282 97	0.000 02	6.91	8.73	414	594	-0.94
11	101		0.075 46		0.002 06		0.001 89		0.000 05	0.283 01	0.000 03	8.59	10.70	344	479	-0.94
12	91		0.040 54		0.000 48		0.000 93		0.000 01	0.282 31	0.000 02	-16.40	-14.50	1 332	2 073	-0.97
13	97		0.030 56		0.000 80		0.000 82		0.000 02	0.282 67	0.000 02	-3.54	-1.47	819	1 253	-0.98
14	92		0.043 01		0.000 87		0.001 08		0.000 02	0.282 38	0.000 03	-14.00	-12.00	1 241	1 920	-0.97
15	298		0.051 84		0.000 60		0.001 35		0.000 01	0.282 58	0.000 02	-6.73	-0.46	959	1 341	-0.96
16	456		0.041 24		0.000 73		0.001 16		0.000 04	0.282 49	0.000 02	-10.10	-0.38	1 087	1 457	-0.96
17	99		0.074 57		0.001 85		0.001 90		0.000 06	0.283 00	0.000 03	7.92	9.97	372	524	-0.94
18	93		0.041 29		0.000 56		0.001 03		0.000 01	0.282 21	0.000 02	-19.70	-17.70	1 465	2 278	-0.97
19	116		0.098 32		0.000 60		0.002 22		0.000 01	0.282 83	0.000 02	2.19	4.57	613	882	-0.93
英安岩(18T22)
01	87	0.017 97		0.000 44		0.000 62		0.000 01		0.282 96	0.000 01	6.78	8.65	405	599	-0.98
02	86	0.062 00		0.000 89		0.002 22		0.000 04		0.282 99	0.000 01	7.85	9.61	378	536	-0.93
03	85	0.029 04		0.000 40		0.000 86		0.000 02		0.282 34	0.000 01	-15.40	-13.60	1 289	2 011	-0.97
04	87	0.051 01		0.001 94		0.001 69		0.000 04		0.283 03	0.000 01	9.20	11.00	317	447	-0.95
05	84	0.059 40		0.000 86		0.002 19		0.000 05		0.283 03	0.000 02	9.18	10.90	322	452	-0.93
06	86	0.056 68		0.000 98		0.002 05		0.000 05		0.283 04	0.000 01	9.62	11.40	303	422	-0.94
07	85	0.052 57		0.000 44		0.001 87		0.000 02		0.283 04	0.000 01	9.63	11.40	301	421	-0.94
08	85	0.061 59		0.000 77		0.002 20		0.000 03		0.283 05	0.000 01	9.78	11.50	297	413	-0.93
09	87	0.062 56		0.000 87		0.002 28		0.000 03		0.283 04	0.000 01	9.61	11.40	305	423	-0.93
10	85	0.038 03		0.000 80		0.001 33		0.000 04		0.283 07	0.000 01	10.54	12.30	260	361	-0.96

Table 4 Zircon Lu-Hf isotope compositions for diorite porphyrites anddacites

样号及测点	年龄/ Ma		¹⁷⁶Yb/ ¹⁷⁷Hf		1σ		¹⁷⁶Lu/ ¹⁷⁷Hf		1σ	¹⁷⁶Hf/ ¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	T_DM1/ Ma	$T D M 2$ / Ma	f_Lu/Hf
闪长玢岩(Q17T6)
01	133		0.029 41		0.000 15		0.000 64		0.000 00	0.282 50	0.000 01	-9.54	-6.68	1 051	1 611	-0.98
02	1 224		0.033 03		0.000 41		0.000 78		0.000 01	0.282 02	0.000 01	-26.64	-0.17	1 727	2 030	-0.98
03	85		0.040 03		0.000 23		0.001 21		0.000 01	0.282 96	0.000 01	6.78	8.58	411	602	-0.96
04	152		0.129 25		0.000 65		0.003 30		0.000 01	0.282 96	0.000 01	6.55	9.55	446	591	-0.90
05	90		0.067 39		0.000 76		0.001 75		0.000 01	0.283 00	0.000 01	8.15	10.00	361	513	-0.95
06	477		0.046 84		0.000 14		0.001 35		0.000 01	0.282 40	0.000 01	-13.2	-3.16	1 219	1 648	-0.96
07	1 537		0.020 65		0.000 31		0.000 58		0.000 01	0.281 64	0.000 01	-39.9	-6.38	2 230	2 655	-0.98
08	90		0.059 60		0.000 99		0.002 18		0.000 04	0.283 00	0.000 02	7.95	9.80	373	527	-0.93
09	90		0.045 90		0.000 16		0.001 39		0.000 01	0.282 89	0.000 02	4.05	16.96	524	775	-0.96
10	611		0.019 58		0.000 09		0.000 43		0.000 00	0.282 33	0.000 01	-15.60	-13.60	1 282	1 696	-0.99
11	91		0.032 21		0.000 49		0.000 89		0.000 01	0.283 01	0.000 01	8.45	27.70	341	490	-0.97
12	891		0.009 73		0.000 07		0.000 29		0.000 00	0.282 23	0.000 01	-19.20	-17.30	1 418	1 746	-0.99
13	90		0.022 78		0.000 07		0.000 65		0.000 00	0.283 06	0.000 01	10.00	11.80	275	388	-0.98
14	84		0.064 82		0.000 29		0.001 94		0.000 02	0.283 06	0.000 01	10.40	12.10	272	376	-0.94
15	116		0.034 64		0.000 65		0.000 86		0.000 02	0.282 64	0.000 01	-4.82	-2.34	870	1 323	-0.97
16	91		0.063 77		0.000 35		0.001 71		0.000 00	0.283 08	0.000 01	11.00	12.90	242	327	-0.95
17	1 935		0.031 10		0.000 16		0.000 80		0.000 00	0.281 60	0.000 01	-41.60	0.51	2 308	2 533	-0.98
18	89		0.072 04		0.000 60		0.002 16		0.000 02	0.282 94	0.000 01	5.86	7.69	460	662	-0.93
19	146		0.048 38		0.000 56		0.001 39		0.000 02	0.282 48	0.000 01	-10.50	-7.42	1 111	1 667	-0.96
20	792		0.043 54		0.000 32		0.001 10		0.000 01	0.282 26	0.000 01	-18.20	-1.31	1 408	1 772	-0.97
21	89		0.056 31		0.000 12		0.001 73		0.000 01	0.283 05	0.000 01	9.88	11.70	290	403	-0.95
22	175		0.088 31		0.000 79		0.002 69		0.000 02	0.282 92	0.000 01	5.37	8.90	487	650	-0.92
23	90		0.066 99		0.000 87		0.001 86		0.000 04	0.281 98	0.000 02	-27.90	-26.00	1 825	2 793	-0.94
24	729		0.072 52		0.000 86		0.002 57		0.000 04	0.283 06	0.000 02	10.30	25.10	281	45	-0.92
25	1 519		0.027 62		0.000 17		0.000 72		0.000 00	0.281 65	0.000 01	-39.50	-6.52	2 223	2 650	-0.98
26	89		0.066 16		0.000 33		0.002 16		0.000 01	0.282 94	0.000 01	5.96	7.79	456	656	-0.93
27	89		0.065 39		0.000 68		0.002 27		0.000 03	0.283 06	0.000 02	10.11	11.90	284	390	-0.93
28	920		0.058 38		0.000 46		0.001 37		0.000 01	0.282 41	0.000 01	-12.80	6.68	1 203	1 367	-0.96
29	90		0.031 52		0.000 25		0.001 09		0.000 01	0.282 94	0.000 03	5.81	7.72	449	661	-0.97
英安岩(DCT25)
01	119		0.053 86		0.002 19		0.001 30		0.000 05	0.282 86	0.000 02	3.07	5.58	562	820	-0.96
02	101		0.031 64		0.001 58		0.000 78		0.000 04	0.282 03	0.000 03	-26.30	-24.10	1 712	2 684	-0.98
03	125		0.076 27		0.001 28		0.001 82		0.000 05	0.282 77	0.000 02	0.03	2.62	695	1 013	-0.95
04	102		0.072 47		0.000 87		0.001 86		0.000 02	0.282 93	0.000 02	5.54	7.65	470	674	-0.94
05	116		0.033 68		0.000 27		0.000 93		0.000 01	0.282 67	0.000 02	-3.52	-1.05	820	1 240	-0.97
06	118		0.078 61		0.000 45		0.001 88		0.000 01	0.282 36	0.000 02	-14.40	-12.00	1 286	1 935	-0.94
07	93		0.090 63		0.003 60		0.002 89		0.000 15	0.283 03	0.000 03	8.99	10.90	337	462	-0.91
08	81		0.090 88		0.001 02		0.002 34		0.000 05	0.283 03	0.000 02	8.95	10.60	333	469	-0.93
09	1 610		0.036 66		0.001 90		0.000 85		0.000 04	0.282 02	0.000 03		8.39	1 725	1 794	-0.97
10	88		0.077 94		0.002 40		0.001 94		0.000 07	0.282 97	0.000 02	6.91	8.73	414	594	-0.94
11	101		0.075 46		0.002 06		0.001 89		0.000 05	0.283 01	0.000 03	8.59	10.70	344	479	-0.94
12	91		0.040 54		0.000 48		0.000 93		0.000 01	0.282 31	0.000 02	-16.40	-14.50	1 332	2 073	-0.97
13	97		0.030 56		0.000 80		0.000 82		0.000 02	0.282 67	0.000 02	-3.54	-1.47	819	1 253	-0.98
14	92		0.043 01		0.000 87		0.001 08		0.000 02	0.282 38	0.000 03	-14.00	-12.00	1 241	1 920	-0.97
15	298		0.051 84		0.000 60		0.001 35		0.000 01	0.282 58	0.000 02	-6.73	-0.46	959	1 341	-0.96
16	456		0.041 24		0.000 73		0.001 16		0.000 04	0.282 49	0.000 02	-10.10	-0.38	1 087	1 457	-0.96
17	99		0.074 57		0.001 85		0.001 90		0.000 06	0.283 00	0.000 03	7.92	9.97	372	524	-0.94
18	93		0.041 29		0.000 56		0.001 03		0.000 01	0.282 21	0.000 02	-19.70	-17.70	1 465	2 278	-0.97
19	116		0.098 32		0.000 60		0.002 22		0.000 01	0.282 83	0.000 02	2.19	4.57	613	882	-0.93
英安岩(18T22)
01	87	0.017 97		0.000 44		0.000 62		0.000 01		0.282 96	0.000 01	6.78	8.65	405	599	-0.98
02	86	0.062 00		0.000 89		0.002 22		0.000 04		0.282 99	0.000 01	7.85	9.61	378	536	-0.93
03	85	0.029 04		0.000 40		0.000 86		0.000 02		0.282 34	0.000 01	-15.40	-13.60	1 289	2 011	-0.97
04	87	0.051 01		0.001 94		0.001 69		0.000 04		0.283 03	0.000 01	9.20	11.00	317	447	-0.95
05	84	0.059 40		0.000 86		0.002 19		0.000 05		0.283 03	0.000 02	9.18	10.90	322	452	-0.93
06	86	0.056 68		0.000 98		0.002 05		0.000 05		0.283 04	0.000 01	9.62	11.40	303	422	-0.94
07	85	0.052 57		0.000 44		0.001 87		0.000 02		0.283 04	0.000 01	9.63	11.40	301	421	-0.94
08	85	0.061 59		0.000 77		0.002 20		0.000 03		0.283 05	0.000 01	9.78	11.50	297	413	-0.93
09	87	0.062 56		0.000 87		0.002 28		0.000 03		0.283 04	0.000 01	9.61	11.40	305	423	-0.93
10	85	0.038 03		0.000 80		0.001 33		0.000 04		0.283 07	0.000 01	10.54	12.30	260	361	-0.96

Fig.7 Zircon εHf(t) values—age for the diorite porphyrite and dacite (data from Fig.4)

Fig.8 Plots of selected major and trace element contents versus loss-on-ignition (LOI) for the diorite porphyrite and dacite

Fig.9 Harker diagrams showing the variations of major and trace elements (based on [54]; data from Fig.4)

Fig.10 Geochemical diagrams for diorite porphyrites and dacites (based on [54]; data from Fig.4). (a) MgO—SiO2 diagram. (b) Mg#—SiO2 diagram.

References 68

[1]	YIN A, HARRISON T M. Geologic evolution of the Himalayan-Tibetan Orogen[J]. Annual Review of Earth and Planetary Sciences, 2000, 28: 211-280.
[2]	ZHU D C, ZHAO Z D, NIU Y L, et al. The Lhasa Terrane: record of a microcontinent and its histories of drift and growth[J]. Earth and Planetary Science Letters, 2011, 301(1/2): 241-255.
[3]	KAPP P, DECELLES P G. Mesozoic-Cenozoic geological evolution of the Himalayan-Tibetan orogen and working tectonic hypotheses[J]. American Journal of Science, 2019, 319(3): 159-254.
[4]	WANG C S, ZHAO X X, LIU Z F, et al. Constraints on the early uplift history of the Tibetan Plateau[J]. Proceedings of the National Academy of Sciences of the United States of America, 2008, 105(13): 4987-4992. DOI PMID
[5]	MURPHY M, YIN A, HARRISON T, et al. Did the Indo-Asia collision alone create the Tibetan Plateau[J]. Geology, 25(8): 719-722.
[6]	WU H, CHEN J W, WANG Q, et al. Spatial and temporal variations in the geochemistry of Cretaceous high-Sr/Y rocks in central Tibet[J]. American Journal of Science, 2019, 319(2): 105-121.
[7]	夏邦栋, 张开均, 孔庆友, 等. 青藏高原内部三条磨拉石带的确定及其构造意义[J]. 地学前缘, 1999, 6(3): 173-180.
[8]	SUN G, HU X, SINCLAIR H, et al. Late Cretaceous evolution of the Coqen Basin (Lhasa Terrane) and implications for early topographic growth on the Tibetan Plateau[J]. Geological Society of America Bulletin, 2015, 127(7/8): 1001-1020.
[9]	ROHRMANN A, KAPP P, CARRAPA B, et al. Thermochronologic evidence for plateau formation in central Tibet by 45 Ma[J]. Geology, 2012, 40(2): 187-190.
[10]	WU H, LIU F, LIU X J, et al. Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: insights into the magmatic and uplift response to slab breakoff[J]. Geosphere, 2023, 19(2): 583-598.
[11]	雷鸣, 陈建林, 许继峰, 等. 拉萨地体中北部尕尔穷晚白垩世早期高镁闪长玢岩地球化学特征指示: 加厚下地壳的拆沉?[J]. 地质通报, 2015, 34(增刊1): 337-346.
[12]	WANG Q, ZHU D C, ZHAO Z D, et al. Origin of the Ca. 90 Ma magnesia-rich volcanic rocks in SE Nyima, central Tibet: products of lithospheric delamination beneath the Lhasa-Qiangtang collision zone[J]. Lithos, 2014, 198: 24-37.
[13]	SUN G, HU X, ZHU D, et al. Thickened juvenile lower crust-derived -90 Ma adakitic rocks in the central Lhasa Terrane, central Tibet[J]. Lithos, 2015, 224/225: 225-239.
[14]	LIU Y S, HU Z C, GAO S, et al. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J]. Chemical Geology, 2008, 257(1/2): 34-43.
[15]	LIU Y S, GAO S, HU Z C, et al. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen: U-Pb dating, Hf isotopes and trace elements in zircons from mantle xenoliths[J]. Journal of Petrology, 2010, 51(1/2): 537-571.
[16]	LUDWIG K R. ISOPLOT3.00: a geochronological toolkit for Microsoft Excel[J]. Berkeley Geochronology Center, Special Publication, 2003, 39: 91-445.
[17]	于红. 陕西商南松树沟橄榄岩矿物地球化学特征及成因机理示踪[D]. 北京: 中国地质大学(北京), 2011.
[18]	HU Z C, LIU Y S, GAO S, et al. A “wire” signal smoothing device for laser ablation inductively coupled plasma mass spectrometry analysis[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2012, 78: 50-57.
[19]	WINCHESTER J A, FLOYD P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chemical Geology, 1977, 20: 325-343.
[20]	HASTIE A R, KERR A C, PEARCE J A, et al. Classification of altered volcanic island arc rocks using immobile trace elements: development of the Th-Co discrimination diagram[J]. Journal of Petrology, 2007, 48(12): 2341-2357.
[21]	DEFANT M J, DRUMMOND M S. Derivation of some modern arc magmas by melting of young subducted lithosphere[J]. Nature, 1990, 347(6294): 662-665.
[22]	CHEN J L, XU J F, YU H X, et al. Late Cretaceous high-Mg^# granitoids in southern Tibet: implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?[J]. Lithos, 2015, 232: 12-22.
[23]	LEI M, CHEN J L, XU J F, et al. Late Cretaceous magmatism in the NW Lhasa terrane, southern Tibet: implications for crustal thickening and initial surface uplift[J]. GSA Bulletin, 2020, 132(1/2): 334-352.
[24]	YI J K, WANG Q, ZHU D C, et al. Westward-younging high-Mg adakitic magmatism in central Tibet: record of a westward-migrating lithospheric foundering beneath the Lhasa-Qiangtang collision zone during the Late Cretaceous[J]. Lithos, 2018, 316/317: 92-103.
[25]	SUN M, TANG J X, CHEN W, et al. Process of lithospheric delamination beneath the Lhasa-Qiangtang collision orogen: constraints from the geochronology and geochemistry of Late Cretaceous volcanic rocks in the Lhasa Terrane, central Tibet[J]. Lithos, 2020, 356、357: 105219.
[26]	SUN S S, MCDONOUGH W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes[J]. Geological Society, London, Special Publications, 1989, 42(1): 313-345.
[27]	张以春, 张予杰, 袁东勋, 等. 班公湖—怒江洋打开时间的地层古生物约束[J]. 岩石学报, 2019, 35(10): 3083-3096.
[28]	FAN J J, NIU Y L, LIU Y M, et al. Timing of closure of the Meso-Tethys ocean: constraints from remnants of a 141—135 Ma ocean island within the Bangong-Nujiang suture zone, Tibetan Plateau[J]. GSA Bulletin, 2021, 133(9/10): 1875-1889.
[29]	杜德道, 曲晓明, 王根厚, 等. 西藏班公湖—怒江缝合带西段中特提斯洋盆的双向俯冲: 来自岛弧型花岗岩锆石U-Pb年龄和元素地球化学的证据[J]. 岩石学报, 2011, 27(7): 1993-2002.
[30]	范建军, 张博川, 刘海永, 等. 班公湖—怒江洋早—中侏罗世洋内俯冲: 来自洞错蛇绿岩的证据[J]. 岩石学报, 2019, 35(10): 3048-3064.
[31]	WU H, XIE C M, LI C, et al. Tectonic shortening and crustal thickening in subduction zones: evidence from Middle-Late Jurassic magmatism in southern Qiangtang, China[J]. Gondwana Research, 2016, 39: 1-13.
[32]	WU H, LIU H, WANG Y, et al. Late Jurassic oceanic plateau subduction in the Bangong-Nujiang Tethyan Ocean of northern Tibet[J]. Geoscience Frontiers, 2024, 15(4): 101813.
[33]	WU H, SUN S L, LIU H Y, et al. An Early Cretaceous slab window beneath central Tibet, SW China: evidence from OIB-like alkaline gabbros in the Duolong area[J]. Terra Nova, 2019, 31(1): 67-75.
[34]	ZHU Z C, ZHAI Q G, HU P Y, et al. Closure of the Bangong-Nujiang Tethyan Ocean in the central Tibet: results from the provenance of the Duoni Formation[J]. Journal of Sedimentary Research, 2019, 89(10): 1039-1054.
[35]	朱志才, 翟庆国, 胡培远, 等. 拉萨—羌塘地体碰撞时限: 来自班公湖—怒江缝合带中段多尼组沉积的约束[J]. 沉积学报, 2020, 38(4): 712-726.
[36]	MA A L, HU X M, GARZANTI E, et al. Sedimentary and tectonic evolution of the southern Qiangtang Basin: implications for the Lhasa-Qiangtang collision timing[J]. Journal of Geophysical Research: Solid Earth, 2017, 122(7): 4790-4813.
[37]	SUN G, HU X, XU Y, et al. Discovery of Middle Jurassic trench deposits in the Bangong-Nujiang suture zone: implications for the timing of Lhasa-Qiangtang initial collision[J]. Tectonophysics, 2019, 750: 344-358.
[38]	MA Y M, YANG T S, BIAN W W, et al. A stable southern margin of Asia during the Cretaceous: paleomagnetic constraints on the Lhasa-Qiangtang collision and the maximum width of the Neo-Tethys[J]. Tectonics, 2018, 37(10): 3853-3876.
[39]	唐熊, 陶晓风. 措勤地区竟柱山组沉积特征及构造意义[J]. 沉积与特提斯地质, 2009, 29 (01): 53-57.
[40]	LAI W, HU X M, GARZANTI E, et al. Initial growth of the Northern Lhasaplano, Tibetan Plateau in the early Late Cretaceous (ca. 92 Ma)[J]. Geological Society of America Bulletin, 2019, 131(11/12): 1823-1836.
[41]	曲晓明, 辛洪波, 徐文艺, 等. 藏西措勤含铜双峰岩系的发现及其意义[J]. 岩石学报, 2006, 22(3): 707-716.
[42]	于云鹏, 王明, 解超明, 等. 西藏拉萨地块北部晚白垩世晚期基性岩墙的成因: 来自锆石U-Pb年代学及地球化学的制约[J]. 岩石学报, 2020, 36(2): 443-454.
[43]	吴建亮, 尹显科, 王波, 等. 藏北阿翁错地区中基性脉岩年代学、地球化学特征及其板内伸展构造作用[J]. 中国地质, 2019, 46(6): 1356-1371.
[44]	吴浩, 徐祖阳, 严维兵, 等. 西藏中部聂尔错地区辉绿岩锆石U-Pb年龄与地球化学特征: 对新特提斯洋板片断离的指示[J/OL]. 中国地质, 2020. https://kns.cnki.net/kcms/detail/11.1167.P.20200831.1558.002.html.
[45]	WU H, QIANGBA Z X, LI C, et al. Geochronology and geochemistry of Early Cretaceous granitic rocks in the Dongqiao area, central Tibet: implications for magmatic origin and geological evolution[J]. The Journal of Geology, 2018, 126(2): 249-260.
[46]	VERMA S P. Seawater alteration effects on ⁸⁷Sr/⁸⁶Sr, K, Rb, Cs, Ba and Sr in oceanic igneous rocks[J]. Chemical Geology, 1981, 34(1/2): 81-89.
[47]	HART S R, STAUDIGEL H. The control of alkalies and uranium in seawater by ocean crust alteration[J]. Earth and Planetary Science Letters, 1982, 58(2): 202-212.
[48]	GUTSCHER M A, MAURY R, EISSEN J P, et al. Can slab melting be caused by flat subduction?[J]. Geology, 2000, 28(6): 535-538.
[49]	CASTILLO P R, JANNEY P E, SOLIDUM R U. Petrology and geochemistry of Camiguin Island, southern Philippines: insights to the source of adakites and other lavas in a complex arc setting[J]. Contributions to Mineralogy and Petrology, 1999, 134(1): 33-51.
[50]	MACPHERSON C G, DREHER S T, THIRLWALL M F. Adakites without slab melting: high pressure differentiation of island arc magma, Mindanao, the Philippines[J]. Earth and Planetary Science Letters, 2006, 243(3/4): 581-593.
[51]	CHUNG S L, LIU D Y, JI J Q, et al. Adakites from continental collision zones: melting of thickened lower crust beneath southern Tibet[J]. Geology, 2003, 31(11): 1021.
[52]	HOU Z Q, GAO Y F, QU X M, et al. Origin of adakitic intrusives generated during Mid-Miocene east-west extension in southern Tibet[J]. Earth and Planetary Science Letters, 2004, 220(1/2): 139-155.
[53]	WU H, LI C, HU P Y, et al. Early Cretaceous (100—105 Ma) adakitic magmatism in the Dachagou area, northern Lhasa Terrane, Tibet: implications for the Bangong-Nujiang ocean subduction and slab break-off[J]. International Geology Review, 2015, 57(9/10): 1172-1188.
[54]	WANG Q, XU J F, JIAN P, et al. Petrogenesis of adakitic porphyries in an extensional tectonic setting, Dexing, South China: implications for the genesis of porphyry copper mineralization[J]. Journal of Petrology, 2006, 47(1): 119-144.
[55]	RAPP R P, WATSON E B. Dehydration melting of metabasalt at 8—32 kbar: implications for continental growth and crust-mantle recycling[J]. Journal of Petrology, 1995, 36(4): 891-931.
[56]	RAPP R P, SHIMIZU N, NORMAN M D, et al. Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa[J]. Chemical Geology, 1999, 160(4): 335-356.
[57]	张立雪, 王青, 朱弟成, 等. 拉萨地体锆石Hf同位素填图: 对地壳性质和成矿潜力的约束[J]. 岩石学报, 2013, 29(11): 3681-3688.
[58]	GAO S, RUDNICK R L, YUAN H L, et al. Recycling lower continental crust in the North China Craton[J]. Nature, 2004, 432(7019): 892-897.
[59]	KAPP P, YIN A, HARRISON T M, et al. Cretaceous-Tertiary shortening, basin development, and volcanism in central Tibet[J]. Geological Society of America Bulletin, 2005, 117(7/8): 865-878.
[60]	ZHAO Z B, BONS P D, LI C, et al. The Cretaceous crustal shortening and thickening of the South Qiangtang Terrane and implications for proto-Tibetan Plateau formation[J]. Gondwana Research, 2020, 78: 141-155.
[61]	WANG Y, ZHANG X M, SUN L X, et al. Cooling history and tectonic exhumation stages of the south-central Tibetan Plateau (China): constrained by ⁴⁰Ar/³⁹Ar and apatite fission track thermochronology[J]. Journal of Asian Earth Sciences, 2007, 29(2/3): 266-282.
[62]	REN Z, CUI J, LIU C, et al. Apatite fission track evidence of uplift: cooling in the Qiangtang Basin and constraints on the Tibetan Plateau uplift[J]. Acta Geologica Sinica (English Edition), 2015, 89(2): 467-484.
[63]	BIRD P. Continental delamination and the Colorado Plateau[J]. Journal of Geophysical Research: Solid Earth, 1979, 84(B13): 7561-7571.
[64]	GRAY R, PYSKLYWEC R N. Geodynamic models of mature continental collision: evolution of an orogen from lithospheric subduction to continental retreat/delamination[J]. Journal of Geophysical Research: Solid Earth, 2013, 118(10): 5733-5735.
[65]	KRYSTOPOWICZ N J, CURRIE C A. Crustal eclogitization and lithosphere delamination in orogens[J]. Earth and Planetary Science Letters, 2013, 361: 195-207.
[66]	ENGLAND P, HOUSEMAN G. Extension during continental convergence, with application to the Tibetan Plateau[J]. Journal of Geophysical Research: Solid Earth, 1989, 94(B12): 17561-17579.
[67]	CHUNG S L, CHU M F, ZHANG Y Q, et al. Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism[J]. Earth-Science Reviews, 2005, 68(3/4): 173-196.
[68]	CHUNG S L, CHU M F, JI J Q, et al. The nature and timing of crustal thickening in southern Tibet: geochemical and zircon Hf isotopic constraints from postcollisional adakites[J]. Tectonophysics, 2009, 477(1/2): 36-48.