扬子地块西缘峨山新元古代高分异I型花岗岩地球化学特征及岩石成因

doi:10.13745/j.esf.sf.2023.6.18

地学前缘 ›› 2024, Vol. 31 ›› Issue (3): 20-39.DOI: 10.13745/j.esf.sf.2023.6.18

扬子地块西缘峨山新元古代高分异I型花岗岩地球化学特征及岩石成因

李光洁¹(), 陈永清¹^,^*(), 尚志¹^,², 刘世博¹

1.中国地质大学(北京) 地球科学与资源学院, 北京 100083
2.中国消防救援学院, 北京 102202

收稿日期:2022-10-04 修回日期:2023-07-03 出版日期:2024-05-25 发布日期:2024-05-25
通信作者: *陈永清(1960—),男,博士,教授,主要从事矿产综合定量勘查与评价研究。E-mail: yqchen@cugb.edu.cn
作者简介:李光洁(1993—),男,博士研究生,地质资源与地质工程专业。E-mail: 2243885496@qq.com
基金资助:
国家自然科学基金项目“成矿系统自组织临界性与矿床定位预测(41972312)”;国家自然科学基金项目“深部致矿异常信息提取与高精度数字找矿模型建立(41672329)”;国家重点研发计划项目“‘三联式’数字找矿模型与深部定量成矿预测(2016YFC0600509)”;中国地质调查局项目“云南个旧大型-超大型Sn-Cu-多金属矿床成矿地球动力学背景、过程和定量评价(1212011220922)”;云南省重点研发计划项目(202303AA080006)

Geochemical characteristics and petrogenesis of the Neoproterozoic Eshan highly fractionated I-type granites, western Yangtze block

LI Guangjie¹(), CHEN Yongqing¹^,^*(), SHANG Zhi¹^,², LIU Shibo¹

1. School of Earth Science and Resources,China University of Geosciences(Beijing), Beijing 100083, China
2. China Fire and Rescue Institute, Beijing 102202, China

Received:2022-10-04 Revised:2023-07-03 Online:2024-05-25 Published:2024-05-25

摘要/Abstract

摘要：

峨山高分异I型花岗岩位于扬子地块西缘,是扬子地块新元古代岩浆岩带的重要组成部分,对其源区、成因及其构造背景进行系统研究能够揭示新元古代地壳演化历史。本文对峨山高分异I型花岗岩开展了LA-MC-ICP-MS锆石U-Pb定年及岩石地球化学研究。研究结果表明,峨山花岗岩主要由肉红色中粗粒花岗岩和灰白色中粗粒花岗岩组成,它们的形成年龄分别为(746±34) Ma (MSWD=4.2)和(732±30) Ma (MSWD=3.3)。全岩地球化学显示峨山花岗岩具有高SiO₂(70.32%~78.41%)、Na₂O(3.09%~3.94%)、K₂O(5.13%~7.35%)含量,低CaO(0.52%~0.90%)、TiO₂(0.001%~0.025%)、P₂O₅(0.061%~0.097%)含量,富集K、Rb、Th等元素,亏损Nb、P、Ti等元素的特征,与高分异I型花岗岩特征一致。全岩Sr-Nd同位素结果显示,ε_Nd(t)=-10.8~-7.5,两阶段Nd模式年龄(T_DM2)为2.3~2.0 Ga。结合区域地质研究,本次研究认为峨山高分异I型花岗岩是在伸展的构造背景下,地幔或年轻下地壳熔融形成的岩浆底侵由中-高钾玄武质岩和黑云母片麻岩组成的古元古代上地壳,经部分熔融产生母岩浆,后经高程度的分离结晶作用而形成的。

关键词: 高分异I型花岗岩, 构造背景, 新元古代, 扬子西缘

Abstract:

The Eshan highly fractionated I-type granites, situated in the western margin of the Yangtze block, represent a significant component of the Neoproterozoic magmatic belt within the region. A comprehensive investigation into their magma source, genesis, and tectonic settings can provide insights into the evolutionary trajectory of the Neoproterozoic crust. This study conducts zircon LA-MC-ICP-MS U-Pb dating and geochemical analyses on the Eshan highly fractionated I-type granites. The results indicate that these granites predominantly consist of red medium-coarse granite and gray-white medium-coarse granite, formed at approximately 746±34 Ma (MSWD=4.2) and 732±30 Ma (MSWD=3.3), respectively. Geochemical analysis reveals a highly fractionated I-type signature characterized by elevated levels of SiO₂ (70.32%-78.41%), Na₂O (3.09%-3.94%), and K₂O (5.13%-7.35%), while exhibiting lower concentrations of CaO (0.52%-0.90%), TiO₂ (0.001%-0.025%), and P₂O₅ (0.061%-0.097%). The rocks exhibit enrichment in K, Rb, Th, and depletion in Nb, P, and Ti. Sr-Nd isotope analysis shows ε_Nd(t) values ranging from -10.8 to -7.5, with two-stage Nd model ages (T_DM2) falling within the range of 2.3 to 2.0 Ga. Integrating these findings with regional geological studies, it is proposed that the Eshan highly fractionated I-type granites originated from the underplating of mantle- and/or juvenile mafic lower crust-derived magma that intruded the upper crust, triggering partial melting of Paleoproterozoic medium- to high-potassium basaltic rocks and biotite gneiss under an extensional tectonic regime. Subsequently, these granites were formed through a process of high fractional crystallization.

Key words: highly fractionated I-type granites, tectonic setting, Neoproterozoic, west margin of Yangtze block

中图分类号:

李光洁, 陈永清, 尚志, 刘世博. 扬子地块西缘峨山新元古代高分异I型花岗岩地球化学特征及岩石成因[J]. 地学前缘, 2024, 31(3): 20-39.

LI Guangjie, CHEN Yongqing, SHANG Zhi, LIU Shibo. Geochemical characteristics and petrogenesis of the Neoproterozoic Eshan highly fractionated I-type granites, western Yangtze block[J]. Earth Science Frontiers, 2024, 31(3): 20-39.

图/表 14

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编号		含量/10^-6				²³²Th/²³⁸U		同位素比值及误差												年龄及误差/Ma
编号		²³²Th		²³⁸U		²³²Th/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		1σ		²⁰⁷Pb/²³⁵U		1σ		²⁰⁶Pb/²³⁸U		1σ		²⁰⁷Pb/²⁰⁶Pb		1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U		1σ
肉红色中粗粒花岗岩
1		286.33		360.09		0.8		0.070 6		0.004		1.05		0.076 9		0.108		0.005		944		79	729	38	661		29
2		333.78		435.72		0.77		0.067 4		0.003 8		1.117 5		0.080 2		0.120 3		0.005 3		849		80	762	38	732		30
3		211.69		229.87		0.92		0.063		0.004		1.231 1		0.095 4		0.141 8		0.006 3		707		92	815	43	855		36
4		540.85		680.67		0.79		0.089 9		0.005 2		1.003 9		0.073		0.081		0.003 6		1 424		74	706	37	502		21
5		120.65		128.89		0.94		0.078 9		0.005 3		1.480 2		0.120 2		0.136		0.006 2		1 170		91	922	49	822		35
6		429.91		521.79		0.82		0.068		0.003 8		0.918		0.065 4		0.097 9		0.004 4		869		78	661	35	602		26
7		196.82		296.7		0.66		0.071 1		0.004 3		1.088 8		0.083		0.111 1		0.005 2		959		83	748	40	679		30
8		382.82		512.32		0.75		0.081 8		0.004 7		1.310 8		0.094 9		0.116 3		0.005 1		1 240		76	850	42	709		30
9		452.31		548.04		0.83		0.072 3		0.004 1		0.948 9		0.068 8		0.095 2		0.004 2		995		79	678	36	586		25
10		348.47		319.68		1.09		0.074 9		0.004 5		1.091 7		0.083 3		0.105 7		0.004 9		1 065		83	749	40	648		29
11		940.53		647.6		1.45		0.076 7		0.004 5		1.059 1		0.079 1		0.100 1		0.004 6		1 114		80	733	39	615		27
12		963.95		1 155.81		0.83		0.094 9		0.005 2		0.751 9		0.053 7		0.057 5		0.002 6		1 526		70	569	31	360		16
13		174.06		240.04		0.73		0.070 4		0.004 3		1.303		0.099 2		0.134 2		0.006		940		86	847	44	812		34
14		316.9		479.63		0.66		0.150 3		0.009 5		1.657 3		0.128 5		0.08		0.003 6		2 350		73	992	49	496		22
15		213.72		368.19		0.58		0.081 4		0.004 6		1.135 4		0.083 1		0.101 2		0.004 7		1 230		75	770	40	622		27
16		160.67		198.38		0.81		0.066 7		0.004 1		1.230 8		0.093 2		0.133 9		0.005 9		827		87	815	42	810		34
17		562.94		376.06		1.5		0.067		0.004 1		0.937 4		0.071 6		0.101 4		0.004 7		838		86	672	38	623		27
18		374		395.9		0.94		0.066 4		0.004 5		1.015 8		0.083 2		0.111		0.005 1		818		97	712	42	679		30
19		267.99		225.54		1.19		0.099 9		0.007 2		1.699 1		0.144 7		0.123 3		0.005 7		1 622		92	1 008	54	750		33
20		342.02		632.93		0.54		0.097 6		0.005 5		1.172 9		0.084 1		0.087 2		0.003 9		1 578		71	788	39	539		23
21		302.72		473.44		0.64		0.147 5		0.012		1.958 7		0.187 6		0.096 3		0.004 9		2 317		96	1 101	64	593		29
22		257.13		436.67		0.59		0.102 9		0.007		1.138 8		0.097 4		0.080 3		0.004 2		1 677		85	772	46	498		25
23		289.32		416.76		0.69		0.067 2		0.003 9		1.160 9		0.084 6		0.125 4		0.005 6		843		81	782	40	761		32
24		415.65		398.12		1.04		0.065		0.003 6		1.053 9		0.074 2		0.117 6		0.005 2		775		78	731	37	717		30
25		989.16		1 916.99		0.52		0.046 1		0.005 6		0.130 5		0.015 1		0.020 6		0.000 8				239	125	14	131		5
26		253.03		198.89		1.27		0.081 2		0.005		1.333		0.102 1		0.119 1		0.005 4		1 227		82	860	44	725		31
27		455.38		597.31		0.76		0.061 3		0.004 6		0.970 2		0.085 8		0.114 9		0.005 3		649		112	689	44	701		31
28		192.32		185.44		1.04		0.064 5		0.004 4		1.326 9		0.108 9		0.149 3		0.006 8		757		99	858	48	897		38
29		294.05		367.14		0.8		0.065 5		0.003 8		1.060 1		0.076 8		0.117 3		0.005 2		791		81	734	38	715		30
30		230.14		200.87		1.15		0.077 7		0.005 5		1.455 2		0.123 4		0.135 8		0.006 3		1 140		97	912	51	821		36
31		260.66		723.58		0.36		0.074 8		0.004 3		0.925 8		0.067 5		0.089 8		0.004		1 062		78	665	36	554		24
32		2 306.86		1 890.61		1.22		0.106		0.006		0.588 4		0.042 4		0.040 3		0.001 8		1 731		70	470	27	255		11
灰白色中粗粒花岗岩
1	149.671 07		156.982 43		0.953 425 6		0.077 07		0.005 9		1.177 2		0.100 21		0.110 78		0.004 13		1 123		111		790	47		677	24
2	634.060 18		483.761 95		1.310 686 3		0.086 76		0.005 8		0.990 53		0.073 62		0.082 8		0.002 7		1 355		93		699	38		513	16
3	306.696 74		304.856 56		1.006 036 2		0.110 17		0.007 26		1.592 37		0.116 52		0.104 83		0.003 34		1 802		87		967	46		643	20
4	168.948 09		144.843 89		1.166 415		0.065 07		0.004 8		1.196 72		0.097 19		0.133 38		0.004 51		777		114		799	45		807	26
5	247.152 57		376.989 63		0.655 595 1		0.070 87		0.004 52		1.183 07		0.084 32		0.121 07		0.003 85		954		94		793	39		737	22
6	2 144.279 7		1 388.478 5		1.544 337 7		0.046 05		0.004		0.249 33		0.020 82		0.039 27		0.000 93				191		226	17		248	6
7	351.505 29		442.921 24		0.793 606 8		0.078 01		0.005 15		1.176 19		0.087 17		0.109 35		0.003 68		1 147		94		790	41		669	21
8	354.322 57		492.087 41		0.720 039 9		0.090 68		0.005 99		0.910 6		0.067 39		0.072 83		0.002 43		1 440		90		657	36		453	15
9	588.123 41		1 102.442 1		0.533 473 3		0.118 68		0.007 99		0.976 23		0.073 56		0.059 66		0.002 02		1 936		87		692	38		374	12
10	888.199 24		1 450.600 9		0.612 297 5		0.140 29		0.009 96		1.021 92		0.080 93		0.052 83		0.001 85		2 231		89		715	41		332	11
11	381.355 69		329.541 85		1.157 229 9		0.080 76		0.005 54		1.342 15		0.101 59		0.120 53		0.003 85		1 216		99		864	44		734	22
12	684.989 16		904.253 14		0.757 519 3		0.098 39		0.006 63		0.852 84		0.063 56		0.062 87		0.002		1 594		92		626	35		393	12
13	513.82		557.321 59		0.921 945 3		0.113 99		0.006 94		1.523 02		0.104 45		0.096 9		0.003 07		1 864		78		940	42		596	18
14	327.226 65		223.377 34		1.464 905 3		0.074 58		0.004 96		1.067		0.080 09		0.103 76		0.003 6		1 057		96		737	39		636	21
15	273.815 28		567.772 16		0.482 262 6		0.101 67		0.006 49		1.231 27		0.088 32		0.087 84		0.002 87		1 655		85		815	40		543	17
16	1 378.725 3		1 453.815 8		0.948 349 3		0.117 6		0.008 99		1.015 11		0.087 21		0.062 6		0.002 46		1 920		98		711	44		391	15
17	154.337 38		192.261 42		0.802 747 5		0.081 87		0.006 78		1.418 34		0.127 18		0.125 65		0.004 34		1 242		122		897	53		763	25
18	926.376 14		1 015.220 9		0.912 487 3		0.090 45		0.005 68		0.773 33		0.054 46		0.062 01		0.001 98		1 435		86		582	31		388	12
19	371.491 7		601.158 91		0.617 959 2		0.084 98		0.006 67		1.378 95		0.122 22		0.117 68		0.004 85		1 315		109		880	52		717	28
20	648.983 33		725.294 6		0.894 785 8		0.096		0.006 66		1.075 78		0.081 87		0.081 27		0.002 54		1 548		96		742	40		504	15
21	577.454 01		500.641 43		1.153 428 3		0.111 14		0.007 18		1.431 01		0.103 16		0.093 39		0.002 98		1 818		85		902	43		576	18
22	1 959.226 1		1 266.946 1		1.546 416 3		0.127 02		0.008 22		1.004 73		0.075 02		0.057 37		0.002 14		2 057		80		706	38		360	13
23	997.528 59		1 169.791 3		0.852 740 6		0.104 31		0.006 23		0.933 56		0.063 59		0.064 91		0.002 12		1 702		78		670	33		405	13
24	345.202 45		623.503 82		0.553 649 3		0.093 71		0.006 06		0.956 16		0.068 54		0.074		0.002 3		1 502		89		681	36		460	14
25	825.054 66		1 672.045 1		0.493 440 4		0.089 28		0.005 39		0.547 17		0.037 41		0.044 45		0.001 43		1 410		82		443	25		280	9
26	256.908 02		280.222 97		0.916 798 6		0.074 67		0.005 22		1.265 81		0.097 93		0.122 96		0.004 08		1 060		103		831	44		748	23
27	240.136 77		314.163 64		0.764 368 4		0.075 47		0.004 81		1.217 98		0.086 52		0.117 04		0.003 67		1 081		92		809	40		714	21
28	1 864.141 2		1 882.394		0.990 303 4		0.152 8		0.008 89		1.105 82		0.073 56		0.052 49		0.001 69		2 377		70		756	35		330	10
29	1 019.152 1		1 778.956 2		0.572 893 3		0.187 9		0.011 55		0.905 2		0.064 31		0.034 94		0.001 25		2 724		71		655	34		221	8
30	262.946 42		365.560 99		0.719 295 6		0.083 47		0.005 58		1.481 89		0.110 29		0.128 76		0.004 2		1 280		94		923	45		781	24
31	1 695.790 1		1 210.949 4		1.400 380 7		0.046 05		0.003 05		0.199 36		0.012 08		0.031 4		0.000 85				146		185	10		199	5
32	424.562 97		514.095 72		0.825 844 2		0.073 18		0.004 55		0.948 37		0.068 67		0.093 99		0.003 49		1 019		88		677	36		579	21

编号		含量/10^-6				²³²Th/²³⁸U		同位素比值及误差												年龄及误差/Ma
编号		²³²Th		²³⁸U		²³²Th/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		1σ		²⁰⁷Pb/²³⁵U		1σ		²⁰⁶Pb/²³⁸U		1σ		²⁰⁷Pb/²⁰⁶Pb		1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U		1σ
肉红色中粗粒花岗岩
1		286.33		360.09		0.8		0.070 6		0.004		1.05		0.076 9		0.108		0.005		944		79	729	38	661		29
2		333.78		435.72		0.77		0.067 4		0.003 8		1.117 5		0.080 2		0.120 3		0.005 3		849		80	762	38	732		30
3		211.69		229.87		0.92		0.063		0.004		1.231 1		0.095 4		0.141 8		0.006 3		707		92	815	43	855		36
4		540.85		680.67		0.79		0.089 9		0.005 2		1.003 9		0.073		0.081		0.003 6		1 424		74	706	37	502		21
5		120.65		128.89		0.94		0.078 9		0.005 3		1.480 2		0.120 2		0.136		0.006 2		1 170		91	922	49	822		35
6		429.91		521.79		0.82		0.068		0.003 8		0.918		0.065 4		0.097 9		0.004 4		869		78	661	35	602		26
7		196.82		296.7		0.66		0.071 1		0.004 3		1.088 8		0.083		0.111 1		0.005 2		959		83	748	40	679		30
8		382.82		512.32		0.75		0.081 8		0.004 7		1.310 8		0.094 9		0.116 3		0.005 1		1 240		76	850	42	709		30
9		452.31		548.04		0.83		0.072 3		0.004 1		0.948 9		0.068 8		0.095 2		0.004 2		995		79	678	36	586		25
10		348.47		319.68		1.09		0.074 9		0.004 5		1.091 7		0.083 3		0.105 7		0.004 9		1 065		83	749	40	648		29
11		940.53		647.6		1.45		0.076 7		0.004 5		1.059 1		0.079 1		0.100 1		0.004 6		1 114		80	733	39	615		27
12		963.95		1 155.81		0.83		0.094 9		0.005 2		0.751 9		0.053 7		0.057 5		0.002 6		1 526		70	569	31	360		16
13		174.06		240.04		0.73		0.070 4		0.004 3		1.303		0.099 2		0.134 2		0.006		940		86	847	44	812		34
14		316.9		479.63		0.66		0.150 3		0.009 5		1.657 3		0.128 5		0.08		0.003 6		2 350		73	992	49	496		22
15		213.72		368.19		0.58		0.081 4		0.004 6		1.135 4		0.083 1		0.101 2		0.004 7		1 230		75	770	40	622		27
16		160.67		198.38		0.81		0.066 7		0.004 1		1.230 8		0.093 2		0.133 9		0.005 9		827		87	815	42	810		34
17		562.94		376.06		1.5		0.067		0.004 1		0.937 4		0.071 6		0.101 4		0.004 7		838		86	672	38	623		27
18		374		395.9		0.94		0.066 4		0.004 5		1.015 8		0.083 2		0.111		0.005 1		818		97	712	42	679		30
19		267.99		225.54		1.19		0.099 9		0.007 2		1.699 1		0.144 7		0.123 3		0.005 7		1 622		92	1 008	54	750		33
20		342.02		632.93		0.54		0.097 6		0.005 5		1.172 9		0.084 1		0.087 2		0.003 9		1 578		71	788	39	539		23
21		302.72		473.44		0.64		0.147 5		0.012		1.958 7		0.187 6		0.096 3		0.004 9		2 317		96	1 101	64	593		29
22		257.13		436.67		0.59		0.102 9		0.007		1.138 8		0.097 4		0.080 3		0.004 2		1 677		85	772	46	498		25
23		289.32		416.76		0.69		0.067 2		0.003 9		1.160 9		0.084 6		0.125 4		0.005 6		843		81	782	40	761		32
24		415.65		398.12		1.04		0.065		0.003 6		1.053 9		0.074 2		0.117 6		0.005 2		775		78	731	37	717		30
25		989.16		1 916.99		0.52		0.046 1		0.005 6		0.130 5		0.015 1		0.020 6		0.000 8				239	125	14	131		5
26		253.03		198.89		1.27		0.081 2		0.005		1.333		0.102 1		0.119 1		0.005 4		1 227		82	860	44	725		31
27		455.38		597.31		0.76		0.061 3		0.004 6		0.970 2		0.085 8		0.114 9		0.005 3		649		112	689	44	701		31
28		192.32		185.44		1.04		0.064 5		0.004 4		1.326 9		0.108 9		0.149 3		0.006 8		757		99	858	48	897		38
29		294.05		367.14		0.8		0.065 5		0.003 8		1.060 1		0.076 8		0.117 3		0.005 2		791		81	734	38	715		30
30		230.14		200.87		1.15		0.077 7		0.005 5		1.455 2		0.123 4		0.135 8		0.006 3		1 140		97	912	51	821		36
31		260.66		723.58		0.36		0.074 8		0.004 3		0.925 8		0.067 5		0.089 8		0.004		1 062		78	665	36	554		24
32		2 306.86		1 890.61		1.22		0.106		0.006		0.588 4		0.042 4		0.040 3		0.001 8		1 731		70	470	27	255		11
灰白色中粗粒花岗岩
1	149.671 07		156.982 43		0.953 425 6		0.077 07		0.005 9		1.177 2		0.100 21		0.110 78		0.004 13		1 123		111		790	47		677	24
2	634.060 18		483.761 95		1.310 686 3		0.086 76		0.005 8		0.990 53		0.073 62		0.082 8		0.002 7		1 355		93		699	38		513	16
3	306.696 74		304.856 56		1.006 036 2		0.110 17		0.007 26		1.592 37		0.116 52		0.104 83		0.003 34		1 802		87		967	46		643	20
4	168.948 09		144.843 89		1.166 415		0.065 07		0.004 8		1.196 72		0.097 19		0.133 38		0.004 51		777		114		799	45		807	26
5	247.152 57		376.989 63		0.655 595 1		0.070 87		0.004 52		1.183 07		0.084 32		0.121 07		0.003 85		954		94		793	39		737	22
6	2 144.279 7		1 388.478 5		1.544 337 7		0.046 05		0.004		0.249 33		0.020 82		0.039 27		0.000 93				191		226	17		248	6
7	351.505 29		442.921 24		0.793 606 8		0.078 01		0.005 15		1.176 19		0.087 17		0.109 35		0.003 68		1 147		94		790	41		669	21
8	354.322 57		492.087 41		0.720 039 9		0.090 68		0.005 99		0.910 6		0.067 39		0.072 83		0.002 43		1 440		90		657	36		453	15
9	588.123 41		1 102.442 1		0.533 473 3		0.118 68		0.007 99		0.976 23		0.073 56		0.059 66		0.002 02		1 936		87		692	38		374	12
10	888.199 24		1 450.600 9		0.612 297 5		0.140 29		0.009 96		1.021 92		0.080 93		0.052 83		0.001 85		2 231		89		715	41		332	11
11	381.355 69		329.541 85		1.157 229 9		0.080 76		0.005 54		1.342 15		0.101 59		0.120 53		0.003 85		1 216		99		864	44		734	22
12	684.989 16		904.253 14		0.757 519 3		0.098 39		0.006 63		0.852 84		0.063 56		0.062 87		0.002		1 594		92		626	35		393	12
13	513.82		557.321 59		0.921 945 3		0.113 99		0.006 94		1.523 02		0.104 45		0.096 9		0.003 07		1 864		78		940	42		596	18
14	327.226 65		223.377 34		1.464 905 3		0.074 58		0.004 96		1.067		0.080 09		0.103 76		0.003 6		1 057		96		737	39		636	21
15	273.815 28		567.772 16		0.482 262 6		0.101 67		0.006 49		1.231 27		0.088 32		0.087 84		0.002 87		1 655		85		815	40		543	17
16	1 378.725 3		1 453.815 8		0.948 349 3		0.117 6		0.008 99		1.015 11		0.087 21		0.062 6		0.002 46		1 920		98		711	44		391	15
17	154.337 38		192.261 42		0.802 747 5		0.081 87		0.006 78		1.418 34		0.127 18		0.125 65		0.004 34		1 242		122		897	53		763	25
18	926.376 14		1 015.220 9		0.912 487 3		0.090 45		0.005 68		0.773 33		0.054 46		0.062 01		0.001 98		1 435		86		582	31		388	12
19	371.491 7		601.158 91		0.617 959 2		0.084 98		0.006 67		1.378 95		0.122 22		0.117 68		0.004 85		1 315		109		880	52		717	28
20	648.983 33		725.294 6		0.894 785 8		0.096		0.006 66		1.075 78		0.081 87		0.081 27		0.002 54		1 548		96		742	40		504	15
21	577.454 01		500.641 43		1.153 428 3		0.111 14		0.007 18		1.431 01		0.103 16		0.093 39		0.002 98		1 818		85		902	43		576	18
22	1 959.226 1		1 266.946 1		1.546 416 3		0.127 02		0.008 22		1.004 73		0.075 02		0.057 37		0.002 14		2 057		80		706	38		360	13
23	997.528 59		1 169.791 3		0.852 740 6		0.104 31		0.006 23		0.933 56		0.063 59		0.064 91		0.002 12		1 702		78		670	33		405	13
24	345.202 45		623.503 82		0.553 649 3		0.093 71		0.006 06		0.956 16		0.068 54		0.074		0.002 3		1 502		89		681	36		460	14
25	825.054 66		1 672.045 1		0.493 440 4		0.089 28		0.005 39		0.547 17		0.037 41		0.044 45		0.001 43		1 410		82		443	25		280	9
26	256.908 02		280.222 97		0.916 798 6		0.074 67		0.005 22		1.265 81		0.097 93		0.122 96		0.004 08		1 060		103		831	44		748	23
27	240.136 77		314.163 64		0.764 368 4		0.075 47		0.004 81		1.217 98		0.086 52		0.117 04		0.003 67		1 081		92		809	40		714	21
28	1 864.141 2		1 882.394		0.990 303 4		0.152 8		0.008 89		1.105 82		0.073 56		0.052 49		0.001 69		2 377		70		756	35		330	10
29	1 019.152 1		1 778.956 2		0.572 893 3		0.187 9		0.011 55		0.905 2		0.064 31		0.034 94		0.001 25		2 724		71		655	34		221	8
30	262.946 42		365.560 99		0.719 295 6		0.083 47		0.005 58		1.481 89		0.110 29		0.128 76		0.004 2		1 280		94		923	45		781	24
31	1 695.790 1		1 210.949 4		1.400 380 7		0.046 05		0.003 05		0.199 36		0.012 08		0.031 4		0.000 85				146		185	10		199	5
32	424.562 97		514.095 72		0.825 844 2		0.073 18		0.004 55		0.948 37		0.068 67		0.093 99		0.003 49		1 019		88		677	36		579	21

岩性	样号	年龄	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	±2σ	ε_Sr(t)	(⁸⁷Sr/⁸⁶S)_i
肉红色中粗粒花岗岩	ZHM1-05	746	17.836 64	0.900 37	0.000 03	94.2	0.710 42
肉红色中粗粒花岗岩	ZHM1-06	746	16.933 61	0.895 21	0.000 03	157.4	0.714 87
灰白色中粗粒花岗岩	ZHM2-01	732	24.018 4	0.963 27	0.000 02	120.7	0.712 31
灰白色中粗粒花岗岩	ZHM2-02	732	13.775 26	0.822 49	0.000 02	-358.9	0.678 55
岩性	样号	±1σ	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	T_DM2
肉红色中粗粒花岗岩	ZHM1-05	0.000 02	0.175 12	0.512 1	0.511 25	-8.4	2 105
肉红色中粗粒花岗岩	ZHM1-06	0.000 03	0.170 56	0.512 07	0.511 24	-8.6	2 120
灰白色中粗粒花岗岩	ZHM2-01	0.000 03	0.216 71	0.512 35	0.511 31	-7.5	2 023
灰白色中粗粒花岗岩	ZHM2-02	0.000 03	0.238 51	0.512 28	0.511 14	-10.8	2 290

岩性	样号	年龄	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	±2σ	ε_Sr(t)	(⁸⁷Sr/⁸⁶S)_i
肉红色中粗粒花岗岩	ZHM1-05	746	17.836 64	0.900 37	0.000 03	94.2	0.710 42
肉红色中粗粒花岗岩	ZHM1-06	746	16.933 61	0.895 21	0.000 03	157.4	0.714 87
灰白色中粗粒花岗岩	ZHM2-01	732	24.018 4	0.963 27	0.000 02	120.7	0.712 31
灰白色中粗粒花岗岩	ZHM2-02	732	13.775 26	0.822 49	0.000 02	-358.9	0.678 55
岩性	样号	±1σ	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	T_DM2
肉红色中粗粒花岗岩	ZHM1-05	0.000 02	0.175 12	0.512 1	0.511 25	-8.4	2 105
肉红色中粗粒花岗岩	ZHM1-06	0.000 03	0.170 56	0.512 07	0.511 24	-8.6	2 120
灰白色中粗粒花岗岩	ZHM2-01	0.000 03	0.216 71	0.512 35	0.511 31	-7.5	2 023
灰白色中粗粒花岗岩	ZHM2-02	0.000 03	0.238 51	0.512 28	0.511 14	-10.8	2 290

岩石	样号	T_Zr/℃	岩石	样号	T_Zr/℃
肉红色中粗粒花岗岩	ZHM1-01	767.1	灰白色中粗粒花岗岩	ZHM2-01	765.0
肉红色中粗粒花岗岩	ZHM1-02	781.3	灰白色中粗粒花岗岩	ZHM2-02	764.9
肉红色中粗粒花岗岩	ZHM1-03	744.7	灰白色中粗粒花岗岩	ZHM2-03	764.3
肉红色中粗粒花岗岩	ZHM1-04	767.5	灰白色中粗粒花岗岩	ZHM2-04	767.3
肉红色中粗粒花岗岩	ZHM1-05	762.8	灰白色中粗粒花岗岩	ZHM2-05	754.4
肉红色中粗粒花岗岩	ZHM1-06	773.9	灰白色中粗粒花岗岩	ZHM2-06	766.4
肉红色中粗粒花岗岩	ZHM1-07	769.2	灰白色中粗粒花岗岩	ZHM2-07	759.6
肉红色中粗粒花岗岩	ZHM1-08	771.5	灰白色中粗粒花岗岩	ZHM2-08	759.3

扬子地块西缘峨山新元古代高分异I型花岗岩地球化学特征及岩石成因

Geochemical characteristics and petrogenesis of the Neoproterozoic Eshan highly fractionated I-type granites, western Yangtze block

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