Continued subduction of the Yangtze Plate in the Middle Neoproterozoic: new evidence based on the geochronology and petro-geochemistry of island arc volcanic rocks in the Nanhua Period

doi:10.13745/j.esf.sf.2020.4.27

Abstract

Abstract:

The Puling Formation in the northern Qimen area on the southeastern margin of the Yangtze Plate, and the Xileng Formation in the Zhangbaling area on the northeastern margin of the Yangtze Plate, each developed a suite of volcanic rocks. The former is continental volcanic rocks with basalt-andesite series, and the latter is marine volcanic rocks with spilite-keratophyre series. The volcanic rocks are unconformities covered with sand mudstone sedimentary. The LA-ICP-MS zircon U-Pb age of basalt-andesite from the Puling Formation is 765±15 Ma, while quartz keratophyre from the Xileng Formation is 726.8±1.4 Ma, indicating they are formed in the Nanhua Period (Middle Neoproterozoic) after the disappearance of the “trench-arc-basin system” formed by the subduction of the Cathaysian to the Yangtze Plate in the Neoproterozoic. The whole rock geochemical analysis showed that the major elemental contents of the two volcanic rocks were quite different, but they all belonged to calc-alkaline series, and with similar trace elemental characteristics: they were enriched in LREE and large ion lithophile elements (e.g., Ba, Th, U), strongly depleted in high field strength elements (e.g., Nb, Ta, Ti), with inconspicuous δEu, Zr and Hf anomalies. These features suggest that they are similar to island arc volcanic rocks and possibly formed by the mixing of the depleted mantle wedges metasomatized by subduction-related fluids and melt of new crust. Combined with previous research results, we consider the deep subduction in the Jinning period might have lasted until ca. 700 Ma, affected by a multi-island arc collage process in the Middle Neoproterozoic, and then this area entered an intra-plate extension stage until the late Nanhua Period.

Key words: Nanhua Period, island arc volcanic rocks, subduction, multi-island arc, Yangtze Plate

CLC Number:

ZHU Qiang, SHI Ke, WU Libin, JIANG Laili, HU Zhaoqi, XU Shengfa, WENG Wangfei. Continued subduction of the Yangtze Plate in the Middle Neoproterozoic: new evidence based on the geochronology and petro-geochemistry of island arc volcanic rocks in the Nanhua Period[J]. Earth Science Frontiers, 2020, 27(4): 17-32.

Figures/Tables 18

References 71

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样品测点	w_B/10^-6			Th/U	同位素比值及误差				同位素年龄及误差/Ma
样品测点	Pb	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ
121001-3
1	55	145	93	1.56	0.126 0	0.002 0	0.376 1	0.007 0	2 044	20	2 058	33
2	15	48	79	0.60	0.085 2	0.002 3	0.151	0.002 8	1 320	41	907	16
3	14	58	92	0.63	0.063 9	0.001 5	0.124 8	0.002 2	738	32	758	13
4	17	71	101	0.71	0.067 8	0.001 5	0.133 8	0.002 4	864	33	810	13
5	46	84	86	0.98	0.123 8	0.002 0	0.383 3	0.006 9	2 011	20	2 092	32
6	56	112	398	0.28	0.064 9	0.001 1	0.123 2	0.002 1	772	24	749	12
7	44	93	77	1.20	0.125 1	0.002 1	0.384 0	0.006 9	2 031	20	2 095	32
8	30	141	173	0.81	0.067 8	0.001 2	0.131 0	0.002 3	863	25	794	13
9	42	106	265	0.40	0.064 4	0.001 2	0.130 8	0.002 4	755	22	792	14
10	20	57	133	0.43	0.065 6	0.001 4	0.124 1	0.002 2	795	25	754	13
11	32	130	179	0.73	0.066 2	0.001 3	0.135 8	0.002 5	814	24	821	14
12	55	375	304	1.23	0.073 4	0.001 3	0.121 2	0.002 1	1 026	18	737	12
13	23	31	151	0.21	0.064 3	0.001 2	0.129 7	0.002 3	753	22	786	13
14	29	54	53	1.02	0.123 0	0.002 1	0.382 8	0.007 1	2 001	17	2 089	33
15	21	80	134	0.59	0.063 4	0.001 5	0.121 6	0.002 2	722	26	740	13
16	30	133	181	0.74	0.068 1	0.001 5	0.121 7	0.002 2	873	27	740	13
17	24	7	45	0.15	0.147 5	0.002 7	0.451 7	0.008 7	2 317	20	2 403	39
18	84	187	544	0.34	0.067 3	0.001 1	0.131 3	0.002 4	847	22	795	14
19	19	101	114	0.89	0.083 8	0.002 8	0.119 3	0.002 4	1 287	41	726	14
20	10	61	55	1.11	0.076 9	0.002 0	0.125 1	0.002 3	1 118	33	760	13
21	23	84	106	0.79	0.068 4	0.001 4	0.153 8	0.003 0	880	27	922	17
22	51	92	290	0.32	0.090 7	0.003 9	0.123 0	0.002 2	1 441	61	748	13
23	37	227	237	0.96	0.067 4	0.001 4	0.121 5	0.002 1	849	23	739	12
24	187	210	348	0.60	0.160 3	0.002 3	0.396 8	0.007 4	2 459	14	2 154	34
25	131	1 555	486	3.20	0.074 5	0.001 5	0.129 2	0.002 3	1 054	20	783	13
150709-3
1	156	226	190	1.19	0.065 4	0.001 5	0.119 6	0.001 5	787	48	728	8
2	136	178	251	0.71	0.065 8	0.001 2	0.119 1	0.001 4	1 200	38	725	8
3	150	213	194	1.09	0.064 2	0.001 1	0.120 2	0.001 2	750	31	732	7
4	56	78	87	0.9	0.063 7	0.001 6	0.119 3	0.001 4	731	52	727	8
5	220	302	233	1.3	0.063 1	0.001 1	0.117 9	0.001 2	722	37	718	7
6	108	154	148	1.04	0.064 9	0.001 2	0.119 3	0.001 3	772	32	727	8
7	54	74	83	0.88	0.066 0	0.001 5	0.118 7	0.001 4	806	42	723	8
8	59	80	97	0.83	0.063 7	0.001 6	0.119 4	0.001 6	731	53	727	9
9	213	320	229	1.4	0.063 6	0.001 1	0.119 0	0.001 2	728	36	725	7
10	82	113	128	0.88	0.066 3	0.001 2	0.119 1	0.001 1	817	32	725	7
11	129	175	197	0.89	0.065 3	0.001 5	0.119 0	0.001 4	783	44	725	8
12	147	212	174	1.22	0.064 2	0.001 5	0.119 4	0.001 2	750	48	727	7
13	63	83	107	0.77	0.063 9	0.001 5	0.119 5	0.001 1	739	52	728	7
14	263	356	344	1.03	0.063 0	0.001 0	0.119 3	0.001 2	707	34	726	7
15	52	63	89	0.71	0.066 7	0.001 7	0.118 4	0.001 6	828	52	721	9
16	125	164	192	0.85	0.063 7	0.001 4	0.119 2	0.001 5	731	46	726	9
17	97	126	139	0.9	0.064 9	0.001 6	0.119 0	0.001 5	772	56	725	9
18	56	70	96	0.73	0.064 6	0.001 8	0.119 5	0.001 6	761	57	728	9
19	53	66	88	0.75	0.064 2	0.001 9	0.119 3	0.001 6	746	63	726	9
20	97	133	110	1.21	0.066 0	0.001 6	0.118 4	0.001 7	806	52	722	10
21	67	86	104	0.82	0.063 0	0.002 0	0.119 2	0.001 4	709	69	726	8
22	54	71	87	0.82	0.065 1	0.001 6	0.118 9	0.001 4	776	52	724	8
23	63	87	73	1.19	0.066 4	0.001 7	0.119 4	0.001 7	820	54	727	10
24	194	263	206	1.28	0.064 7	0.001 2	0.119 4	0.001 4	765	237	727	8
25	62	81	103	0.79	0.066 1	0.001 9	0.118 7	0.001 4	809	64	723	8

样品测点	w_B/10^-6			Th/U	同位素比值及误差				同位素年龄及误差/Ma
样品测点	Pb	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ
121001-3
1	55	145	93	1.56	0.126 0	0.002 0	0.376 1	0.007 0	2 044	20	2 058	33
2	15	48	79	0.60	0.085 2	0.002 3	0.151	0.002 8	1 320	41	907	16
3	14	58	92	0.63	0.063 9	0.001 5	0.124 8	0.002 2	738	32	758	13
4	17	71	101	0.71	0.067 8	0.001 5	0.133 8	0.002 4	864	33	810	13
5	46	84	86	0.98	0.123 8	0.002 0	0.383 3	0.006 9	2 011	20	2 092	32
6	56	112	398	0.28	0.064 9	0.001 1	0.123 2	0.002 1	772	24	749	12
7	44	93	77	1.20	0.125 1	0.002 1	0.384 0	0.006 9	2 031	20	2 095	32
8	30	141	173	0.81	0.067 8	0.001 2	0.131 0	0.002 3	863	25	794	13
9	42	106	265	0.40	0.064 4	0.001 2	0.130 8	0.002 4	755	22	792	14
10	20	57	133	0.43	0.065 6	0.001 4	0.124 1	0.002 2	795	25	754	13
11	32	130	179	0.73	0.066 2	0.001 3	0.135 8	0.002 5	814	24	821	14
12	55	375	304	1.23	0.073 4	0.001 3	0.121 2	0.002 1	1 026	18	737	12
13	23	31	151	0.21	0.064 3	0.001 2	0.129 7	0.002 3	753	22	786	13
14	29	54	53	1.02	0.123 0	0.002 1	0.382 8	0.007 1	2 001	17	2 089	33
15	21	80	134	0.59	0.063 4	0.001 5	0.121 6	0.002 2	722	26	740	13
16	30	133	181	0.74	0.068 1	0.001 5	0.121 7	0.002 2	873	27	740	13
17	24	7	45	0.15	0.147 5	0.002 7	0.451 7	0.008 7	2 317	20	2 403	39
18	84	187	544	0.34	0.067 3	0.001 1	0.131 3	0.002 4	847	22	795	14
19	19	101	114	0.89	0.083 8	0.002 8	0.119 3	0.002 4	1 287	41	726	14
20	10	61	55	1.11	0.076 9	0.002 0	0.125 1	0.002 3	1 118	33	760	13
21	23	84	106	0.79	0.068 4	0.001 4	0.153 8	0.003 0	880	27	922	17
22	51	92	290	0.32	0.090 7	0.003 9	0.123 0	0.002 2	1 441	61	748	13
23	37	227	237	0.96	0.067 4	0.001 4	0.121 5	0.002 1	849	23	739	12
24	187	210	348	0.60	0.160 3	0.002 3	0.396 8	0.007 4	2 459	14	2 154	34
25	131	1 555	486	3.20	0.074 5	0.001 5	0.129 2	0.002 3	1 054	20	783	13
150709-3
1	156	226	190	1.19	0.065 4	0.001 5	0.119 6	0.001 5	787	48	728	8
2	136	178	251	0.71	0.065 8	0.001 2	0.119 1	0.001 4	1 200	38	725	8
3	150	213	194	1.09	0.064 2	0.001 1	0.120 2	0.001 2	750	31	732	7
4	56	78	87	0.9	0.063 7	0.001 6	0.119 3	0.001 4	731	52	727	8
5	220	302	233	1.3	0.063 1	0.001 1	0.117 9	0.001 2	722	37	718	7
6	108	154	148	1.04	0.064 9	0.001 2	0.119 3	0.001 3	772	32	727	8
7	54	74	83	0.88	0.066 0	0.001 5	0.118 7	0.001 4	806	42	723	8
8	59	80	97	0.83	0.063 7	0.001 6	0.119 4	0.001 6	731	53	727	9
9	213	320	229	1.4	0.063 6	0.001 1	0.119 0	0.001 2	728	36	725	7
10	82	113	128	0.88	0.066 3	0.001 2	0.119 1	0.001 1	817	32	725	7
11	129	175	197	0.89	0.065 3	0.001 5	0.119 0	0.001 4	783	44	725	8
12	147	212	174	1.22	0.064 2	0.001 5	0.119 4	0.001 2	750	48	727	7
13	63	83	107	0.77	0.063 9	0.001 5	0.119 5	0.001 1	739	52	728	7
14	263	356	344	1.03	0.063 0	0.001 0	0.119 3	0.001 2	707	34	726	7
15	52	63	89	0.71	0.066 7	0.001 7	0.118 4	0.001 6	828	52	721	9
16	125	164	192	0.85	0.063 7	0.001 4	0.119 2	0.001 5	731	46	726	9
17	97	126	139	0.9	0.064 9	0.001 6	0.119 0	0.001 5	772	56	725	9
18	56	70	96	0.73	0.064 6	0.001 8	0.119 5	0.001 6	761	57	728	9
19	53	66	88	0.75	0.064 2	0.001 9	0.119 3	0.001 6	746	63	726	9
20	97	133	110	1.21	0.066 0	0.001 6	0.118 4	0.001 7	806	52	722	10
21	67	86	104	0.82	0.063 0	0.002 0	0.119 2	0.001 4	709	69	726	8
22	54	71	87	0.82	0.065 1	0.001 6	0.118 9	0.001 4	776	52	724	8
23	63	87	73	1.19	0.066 4	0.001 7	0.119 4	0.001 7	820	54	727	10
24	194	263	206	1.28	0.064 7	0.001 2	0.119 4	0.001 4	765	237	727	8
25	62	81	103	0.79	0.066 1	0.001 9	0.118 7	0.001 4	809	64	723	8

样品号	w_B/%																							Mg^#
样品号	SiO₂		Al₂O₃		Fe₂O₃		FeO		CaO		MgO			K₂O		Na₂O		TiO₂		P₂O₅	MnO	LOI	Total	Mg^#
121001-1	52.28		15.84		3.49		4.57		5.02		6.25			0.103		5.95		0.7		0.107	0.136	4.85	99.29	71.1
121001-2	50.25		15.76		4		5.88		5.2		7.96			0.045		5.11		0.8		0.085	0.199	3.91	99.20	70.9
121001-3	50.21		17.54		2.68		6.34		2.28		8.79			0.024		5.77		0.78		0.094	0.168	4.42	99.10	71.4
121001-4	51.34		15.99		5.38		5.14		4.25		7.55			0.03		5.13		0.72		0.092	0.159	3.43	99.21	72.6
121001-5	49.49		15.52		4.13		5.72		6.4		7.79			0.023		4.87		0.81		0.082	0.196	4.19	99.22	71.0
121001-6	50.24		15.68		3.63		5.72		6.49		6.86			0.028		5.16		0.77		0.081	0.162	4.4	99.22	68.3
1210017	49.37		16.21		2.93		6.76		5.8		8.87			0.037		4.4		0.81		0.089	0.172	3.63	99.08	70.3
H083-2	54.1		14.69		1.74		7.81		6.6		5.72			0.8		4.48		1.17		0.123	0.179	1.59	99.00	56.9
H083-3	60.79		13.6		1.49		7.17		3.64		2.92			1.65		3.89		1.68		0.163	0.118	1.96	99.07	42.3
H083-4	57.14		13.2		0.974		8.37		5		2.44			0.337		4.21		1.45		0.191	0.153	5.5	98.97	34.4
H083-5	59.62		13.6		1.41		7.69		4.41		3.45			1.12		4.97		1.39		0.21	0.162	0.995	99.03	44.7
H083-6	48.32		16.12		6.42		6.79		9.88		3.38			1.41		1.6		1.88		0.266	0.2	2.74	99.01	47.3
H083-7	56.97		14.14		2.87		6.98		4.64		3.43			0.987		5.9		1.38		0.21	0.146	1.44	99.09	46.9
H083-8	54.49		14.76		2.28		7.76		5.75		4.65			0.528		5.1		1.42		0.171	0.185	1.91	99.00	51.9
样品号	w_B/10^-6
样品号	La		Ce		Pr		Nd		Sm		Eu			Gd		Tb		Dy		Ho	Er	Tm	Yb	Lu
121001-1	10.5		20.7		2.85		12.4		2.98		0.72			3.01		0.58		4.08		0.89	2.4	0.37	2.33	0.3
121001-2	6.5		13.7		1.98		9.32		2.56		0.78			2.84		0.58		4.02		0.86	2.35	0.37	2.31	0.3
121001-3	7.2		14.3		2.24		10.4		2.86		0.71			3.03		0.62		4.35		0.94	2.56	0.4	2.48	0.32
121001-4	9.51		16.2		2.37		10.6		2.7		1.21			2.82		0.55		3.8		0.82	2.27	0.36	2.31	0.29
121001-5	5.21		11.4		1.67		8.11		2.35		0.67			2.61		0.54		3.76		0.81	2.24	0.35	2.25	0.3
121001-6	5.42		11.8		1.73		8.13		2.35		0.93			2.62		0.53		3.68		0.78	2.1	0.32	2.18	0.25
1210017	6.3		13.3		1.93		9.12		2.59		0.82			2.84		0.57		4.05		0.85	2.37	0.37	2.37	0.29
H083-2	8.98		18.4		2.92		13.7		3.88		1.13			3.76		0.78		5.42		1.15	3.05	0.47	2.92	0.38
H083-3	21		39.4		5.67		24.7		5.92		1.47			5.47		1.06		6.99		1.42	3.76	0.58	3.67	0.48
H083-4	16.7		32.4		4.82		21.4		5.3		1.4			4.92		0.93		6.08		1.22	3.14	0.48	2.93	0.39
H083-5	19.9		37.3		5.56		24.6		6.3		1.65			5.91		1.15		7.54		1.53	3.95	0.59	3.69	0.46
H083-6	24.7		44.4		6.76		29.9		7.32		2.21			6.97		1.32		8.72		1.8	4.62	0.69	4.27	0.54
H083-7	9.27		17.2		2.55		11.4		2.91		0.72			2.86		0.56		3.68		0.76	1.96	0.3	1.86	0.24
H083-8	21.1		35.4		5.38		24		5.87		1.7			5.75		1.12		7.28		1.51	3.88	0.6	3.72	0.51
样品号	w_B/10^-6																					(La/ Yb)_N	δEu	δCe
样品号	Rb	Ba		Th		U		Nb		Ta		Sr	Zr		Hf		Y		∑REE			(La/ Yb)_N	δEu	δCe
121001-1	4.96		184		1.91		0.39		7.4		0.6			125		76.2		2.96		21.3	64.11	3.23	0.73	0.91
121001-2	1.79		112		1.6		0.3		2.63		0.23			89.7		63		2.57		19.8	48.47	2.02	0.88	0.93
121001-3	1.1		148		1.46		0.25		1.82		0.16			70.6		60.6		2.52		22.3	52.41	2.08	0.73	0.87
121001-4	0.71		256		1.4		0.22		1.6		0.14			138		53.8		2.24		18.8	55.81	2.95	1.33	0.81
121001-5	0.78		109		1.54		0.26		2.17		0.19			94.8		60.7		2.53		18.8	42.27	1.66	0.82	0.94
121001-6	0.86		76.4		1.54		0.25		2.3		0.21			124		57		2.43		18.4	42.82	1.78	1.14	0.94
1210017	1.28		71.7		1.71		0.31		2.42		0.21			202		64.7		2.66		20.2	47.77	1.91	0.92	0.93
H083-2	31.6		236		2.86		0.93		4.51		0.37			169		113		3.66		30.8	66.94	2.21	0.89	0.88
H083-3	72.7		442		6.77		1.77		11.2		0.86			151		236		6.96		37.5	121.59	4.10	0.78	0.87
H083-4	17.6		128		4.94		1.27		7.38		0.59			155		170		5.14		32.2	102.11	4.09	0.82	0.87
H083-5	50.5		258		4.76		1.35		8.09		0.6			86		189		5.5		40.2	120.13	3.87	0.81	0.86
H083-6	87.9		371		5.27		2.44		14.4		1.14			769		333		9.86		51	144.22	4.15	0.93	0.83
H083-7	42.5		265		4.17		1.11		7.06		0.55			92.6		165		5		19.8	56.27	3.57	0.75	0.85
H083-8	18.4		164		4.32		1.11		6.61		0.51			116		153		4.63		41.3	117.82	4.07	0.88	0.79

样品号	w_B/%																							Mg^#
样品号	SiO₂		Al₂O₃		Fe₂O₃		FeO		CaO		MgO			K₂O		Na₂O		TiO₂		P₂O₅	MnO	LOI	Total	Mg^#
121001-1	52.28		15.84		3.49		4.57		5.02		6.25			0.103		5.95		0.7		0.107	0.136	4.85	99.29	71.1
121001-2	50.25		15.76		4		5.88		5.2		7.96			0.045		5.11		0.8		0.085	0.199	3.91	99.20	70.9
121001-3	50.21		17.54		2.68		6.34		2.28		8.79			0.024		5.77		0.78		0.094	0.168	4.42	99.10	71.4
121001-4	51.34		15.99		5.38		5.14		4.25		7.55			0.03		5.13		0.72		0.092	0.159	3.43	99.21	72.6
121001-5	49.49		15.52		4.13		5.72		6.4		7.79			0.023		4.87		0.81		0.082	0.196	4.19	99.22	71.0
121001-6	50.24		15.68		3.63		5.72		6.49		6.86			0.028		5.16		0.77		0.081	0.162	4.4	99.22	68.3
1210017	49.37		16.21		2.93		6.76		5.8		8.87			0.037		4.4		0.81		0.089	0.172	3.63	99.08	70.3
H083-2	54.1		14.69		1.74		7.81		6.6		5.72			0.8		4.48		1.17		0.123	0.179	1.59	99.00	56.9
H083-3	60.79		13.6		1.49		7.17		3.64		2.92			1.65		3.89		1.68		0.163	0.118	1.96	99.07	42.3
H083-4	57.14		13.2		0.974		8.37		5		2.44			0.337		4.21		1.45		0.191	0.153	5.5	98.97	34.4
H083-5	59.62		13.6		1.41		7.69		4.41		3.45			1.12		4.97		1.39		0.21	0.162	0.995	99.03	44.7
H083-6	48.32		16.12		6.42		6.79		9.88		3.38			1.41		1.6		1.88		0.266	0.2	2.74	99.01	47.3
H083-7	56.97		14.14		2.87		6.98		4.64		3.43			0.987		5.9		1.38		0.21	0.146	1.44	99.09	46.9
H083-8	54.49		14.76		2.28		7.76		5.75		4.65			0.528		5.1		1.42		0.171	0.185	1.91	99.00	51.9
样品号	w_B/10^-6
样品号	La		Ce		Pr		Nd		Sm		Eu			Gd		Tb		Dy		Ho	Er	Tm	Yb	Lu
121001-1	10.5		20.7		2.85		12.4		2.98		0.72			3.01		0.58		4.08		0.89	2.4	0.37	2.33	0.3
121001-2	6.5		13.7		1.98		9.32		2.56		0.78			2.84		0.58		4.02		0.86	2.35	0.37	2.31	0.3
121001-3	7.2		14.3		2.24		10.4		2.86		0.71			3.03		0.62		4.35		0.94	2.56	0.4	2.48	0.32
121001-4	9.51		16.2		2.37		10.6		2.7		1.21			2.82		0.55		3.8		0.82	2.27	0.36	2.31	0.29
121001-5	5.21		11.4		1.67		8.11		2.35		0.67			2.61		0.54		3.76		0.81	2.24	0.35	2.25	0.3
121001-6	5.42		11.8		1.73		8.13		2.35		0.93			2.62		0.53		3.68		0.78	2.1	0.32	2.18	0.25
1210017	6.3		13.3		1.93		9.12		2.59		0.82			2.84		0.57		4.05		0.85	2.37	0.37	2.37	0.29
H083-2	8.98		18.4		2.92		13.7		3.88		1.13			3.76		0.78		5.42		1.15	3.05	0.47	2.92	0.38
H083-3	21		39.4		5.67		24.7		5.92		1.47			5.47		1.06		6.99		1.42	3.76	0.58	3.67	0.48
H083-4	16.7		32.4		4.82		21.4		5.3		1.4			4.92		0.93		6.08		1.22	3.14	0.48	2.93	0.39
H083-5	19.9		37.3		5.56		24.6		6.3		1.65			5.91		1.15		7.54		1.53	3.95	0.59	3.69	0.46
H083-6	24.7		44.4		6.76		29.9		7.32		2.21			6.97		1.32		8.72		1.8	4.62	0.69	4.27	0.54
H083-7	9.27		17.2		2.55		11.4		2.91		0.72			2.86		0.56		3.68		0.76	1.96	0.3	1.86	0.24
H083-8	21.1		35.4		5.38		24		5.87		1.7			5.75		1.12		7.28		1.51	3.88	0.6	3.72	0.51
样品号	w_B/10^-6																					(La/ Yb)_N	δEu	δCe
样品号	Rb	Ba		Th		U		Nb		Ta		Sr	Zr		Hf		Y		∑REE			(La/ Yb)_N	δEu	δCe
121001-1	4.96		184		1.91		0.39		7.4		0.6			125		76.2		2.96		21.3	64.11	3.23	0.73	0.91
121001-2	1.79		112		1.6		0.3		2.63		0.23			89.7		63		2.57		19.8	48.47	2.02	0.88	0.93
121001-3	1.1		148		1.46		0.25		1.82		0.16			70.6		60.6		2.52		22.3	52.41	2.08	0.73	0.87
121001-4	0.71		256		1.4		0.22		1.6		0.14			138		53.8		2.24		18.8	55.81	2.95	1.33	0.81
121001-5	0.78		109		1.54		0.26		2.17		0.19			94.8		60.7		2.53		18.8	42.27	1.66	0.82	0.94
121001-6	0.86		76.4		1.54		0.25		2.3		0.21			124		57		2.43		18.4	42.82	1.78	1.14	0.94
1210017	1.28		71.7		1.71		0.31		2.42		0.21			202		64.7		2.66		20.2	47.77	1.91	0.92	0.93
H083-2	31.6		236		2.86		0.93		4.51		0.37			169		113		3.66		30.8	66.94	2.21	0.89	0.88
H083-3	72.7		442		6.77		1.77		11.2		0.86			151		236		6.96		37.5	121.59	4.10	0.78	0.87
H083-4	17.6		128		4.94		1.27		7.38		0.59			155		170		5.14		32.2	102.11	4.09	0.82	0.87
H083-5	50.5		258		4.76		1.35		8.09		0.6			86		189		5.5		40.2	120.13	3.87	0.81	0.86
H083-6	87.9		371		5.27		2.44		14.4		1.14			769		333		9.86		51	144.22	4.15	0.93	0.83
H083-7	42.5		265		4.17		1.11		7.06		0.55			92.6		165		5		19.8	56.27	3.57	0.75	0.85
H083-8	18.4		164		4.32		1.11		6.61		0.51			116		153		4.63		41.3	117.82	4.07	0.88	0.79

样品号	w_B/%																						Mg^#
样品号	SiO₂		TiO₂		Al₂O₃		TFe₂O₃		MnO		MgO		CaO		Na₂O		K₂O		P₂O₅	BaO	LOI	Total	Mg^#
160725-1	73.24		0.41		13.36		3.00		0.14		0.51		0.65		5.60		1.93		0.05	0.06	0.55	99.50	25
160725-2	73.63		0.32		13.66		2.63		0.16		0.53		0.66		5.88		1.86		0.05	0.10	0.72	100.20	29
160725-3	73.33		0.36		13.67		2.70		0.17		0.56		0.70		5.74		2.00		0.05	0.11	0.83	100.22	29
160725-4	71.87		0.35		14.17		3.35		0.25		0.76		0.68		5.78		2.20		0.05	0.12	0.72	100.30	31
样品号	w_B/10^-6
样品号	La		Ce		Pr		Nd		Sm		Eu		Gd		Tb		Dy		Ho	Er	Tm	Yb	Lu
160725-1	29.30		56.30		6.30		25.00		5.29		1.91		5.17		0.80		4.72		1.05	3.16	0.49	2.97	0.45
160725-2	39.50		63.80		6.58		25.80		5.45		2.05		5.40		0.81		4.81		1.00	3.12	0.43	2.86	0.42
160725-3	39.50		67.40		7.13		28.20		6.12		2.21		6.15		0.86		5.15		1.05	3.01	0.45	2.74	0.40
160725-4	45.30		78.30		7.45		28.90		5.68		2.15		5.57		0.84		4.93		1.04	3.19	0.47	3.14	0.46
样品号	w_B/10^-6																				(La/ Yb)_N	δEu	δCe
样品号	Rb	Sr		Ba		Th		U		Zr	Hf	Nb		Ta		Y		ΣREE			(La/ Yb)_N	δEu	δCe
160725-1	92.70		126.00		552.00		4.17		1.09		169.00		4.40		7.00		0.50		28.30	142.91	7.08	1.10	0.97
160725-2	82.70		166.00		937.00		3.84		0.90		140.00		3.80		6.30		0.50		28.20	162.03	9.91	1.14	0.88
160725-3	81.60		167.00		1075.00		3.87		0.95		155.00		3.80		6.60		0.50		29.70	170.37	10.34	1.09	0.91
160725-4	96.40		152.50		1060.00		4.42		0.94		165.00		4.50		7.50		0.50		29.60	187.42	10.35	1.15	0.95