西藏冈底斯南缘中侏罗世辉长闪长岩锆石U-Pb定年和Lu-Hf同位素组成及其构造意义

doi:10.19657/j.geoscience.1000-8527.2019.01.07

现代地质 ›› 2019, Vol. 33 ›› Issue (01): 63-72.DOI: 10.19657/j.geoscience.1000-8527.2019.01.07

西藏冈底斯南缘中侏罗世辉长闪长岩锆石U-Pb定年和Lu-Hf同位素组成及其构造意义

杨鑫朋¹(), 张振利²(), 张泽国³, 王金贵¹, 邓科³, 侯德华¹

1.河北省区域地质调查院,河北廊坊 065000
2.河北地质大学资源学院,河北石家庄 050000
3.西藏自治区地质矿产勘查开发局第五地质大队,青海格尔木 816000

收稿日期:2018-01-26 修回日期:2018-11-25 出版日期:2019-02-26 发布日期:2019-02-28
通讯作者: 张振利
作者简介:张振利,男,教授,1957年出生,地质工程专业,主要从事构造地质学研究。Email:airstarry@163.com。
杨鑫朋,男,硕士,1990年出生,地质工程专业,主要从事区域构造与构造动力学研究。Email:yangxinpeng1101@163.com。
基金资助:
中国地质调查局项目“冈底斯—喜马拉雅铜矿资源基地调查”(DD20160015-09)

Zircon U-Pb Age and Lu-Hf Isotopes for Middle Jurassic Gabbro-diorite in Southern Margin of Gangdese Magmatic Belt and Its Tectonic Implications

YANG Xinpeng¹(), ZHANG Zhenli²(), ZHANG Zeguo³, WANG Jingui¹, DENG Ke³, HOU Dehua¹

1. Hebei Institute of Regional Geological Survey, Langfang,Hebei 065000,China
2. School of Nature Resource,Hebei University of Geosciences, Shijiazhuang,Hebei 050000,China
3. The Fifth Geological Brigade of Tibet Autonomous Region Geological Exploration and Development Bureau, Geermu,Qinghai 816000, China

Received:2018-01-26 Revised:2018-11-25 Online:2019-02-26 Published:2019-02-28
Contact: ZHANG Zhenli

摘要/Abstract

摘要：

为解释冈底斯南缘新发现的中基性岩体构造环境及物质来源等信息,以西藏自治区贡嘎县昌果乡辉长闪长岩为研究对象,通过开展锆石U-Pb定年、Hf同位素组成、全岩地球化学分析,得到岩体锆石年龄为(165±1.1) Ma。样品富集大离子亲石元素,亏损高场强元素,具有富铝(Al₂O₃=18.84%~20.70%)、富钾的特征,在构造判别图解中样品多落在挤压岛弧区域,表明其形成构造环境应为俯冲岛弧环境。样品具较为平缓的稀土配分曲线,岩浆分异程度较低,无明显Eu异常,(La/Yb)_N平均值为2.30(<4.3),与幔源岩浆的稀土配分型式相似。锆石Hf同位素显示ε_Hf(t)值为很高的正值(12.97~18.74),二阶段模式年龄集中在150~218 Ma,略大于其侵位年龄,表明幔源岩浆在侵位过程中受到地壳物质的混染。结合区域构造演化史认为该岩体形成于新特提斯洋向冈底斯俯冲过程中的成熟岛弧期,从而也进一步证实了南冈底斯在中侏罗世处于俯冲岛弧构造环境。

关键词: 南冈底斯, 新特提斯洋俯冲, Lu-Hf同位素, 幔源岩浆

Abstract:

In order to elucidate the tectonic setting and magma source of the gabbro-diorite in the southern margin of the Gangdese magmatic belt, we conducted zircon U-Pb age and Lu-Hf isotope analyses, and whole-rock major and trace elements analyses. The zircon U-Pb dating yielded (165±1.1) Ma for the gabbro-diorite. Geochemically, the gabbro-diorite is enriched in LILEs, Al₂O₃ and K₂O, but depleted in HFSEs. The sample data points are distributed in the island arc field in tectonic discrimination diagrams, and have clear island arc geochemical affinities.The chondrite-normalized REE patterns are flat with no Eu anomalies, showing low degree of magma differentiation. The mean (La/Yb)_N value is 2.30(<4.3), and the rocks have similar REE patterns to typical mantle-derived magmas. The gabbro-diorite samples have highly depleted zircon Hf isotopic compositions, with ε_Hf(t) values of 12.97-18.74 and two-stage Hf model ages of 150-218 Ma, indicating that the mantle-derived magma was influenced by crustal assimilation. Integrated whole-rock geochemical and zircon isotopic analyses suggest that the gabbro-diorite was formed in a mature island arc formed by the Neo-Tethyan subduction, which further indicates that the Gangdese magmatic arc was in a subduction setting during the Middle Jurassic.

Key words: southern margin of Gangdese, Neo-Tethyan subduction, Lu-Hf isotopic, mantle-derived magma

中图分类号:

588.1

杨鑫朋, 张振利, 张泽国, 王金贵, 邓科, 侯德华. 西藏冈底斯南缘中侏罗世辉长闪长岩锆石U-Pb定年和Lu-Hf同位素组成及其构造意义[J]. 现代地质, 2019, 33(01): 63-72.

YANG Xinpeng, ZHANG Zhenli, ZHANG Zeguo, WANG Jingui, DENG Ke, HOU Dehua. Zircon U-Pb Age and Lu-Hf Isotopes for Middle Jurassic Gabbro-diorite in Southern Margin of Gangdese Magmatic Belt and Its Tectonic Implications[J]. Geoscience, 2019, 33(01): 63-72.

图/表 13

参考文献 37

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样品编号	主量元素w_B/%
样品编号	SiO₂			Al₂O₃			TiO₂			Fe₂O₃			FeO			MnO				MgO			CaO			Na₂O			K₂O			P₂O₅			烧失量				∑
D4821YQ1	47.21			19.05			1.08			4.11			5.88			0.18				5.16			8.68			2.00			0.88			0.16			5.47				99.87
D4831YQ1	48.38			18.69			0.89			4.35			4.65			0.17				4.47			9.49			2.55			0.69			0.10			5.45				99.89
D4841YQ1	47.69			19.26			0.98			3.70			5.65			0.17				4.99			8.36			2.45			0.98			0.14			5.52				99.87
D9905YQ1	50.14			20.70			0.90			3.13			4.47			0.13				2.94			6.94			3.64			1.55			0.15			5.20				99.90
D9906YQ1	47.16			18084			1.02			4.03			5.55			0.18				4.86			9.24			2.42			0.70			0.11			5.76				99.88
样品编号	稀土元素w_B/10^-6
样品编号	La	Ce			Pr			Nd			Sm		Eu		Gd			Tb			Dy			Ho		Er		Tm			Yb			Lu			Y		∑REE
D4821XT1	4.32	9.83			1.60			7.62			1.99		0.82		1.99			0.39			2.57			0.51		1.40		0.24			1.54			0.24			12.11		47.17
D4831XT1	3.84	8.44			1.42			6.66			1.77		0.78		1.73			0.36			2.41			0.48		1.35		0.23			1.47			0.25			12.46		43.63
D4841XT1	5.22	11.32			1.85			8.56			2.19		0.87		2.12			0.42			2.82			0.55		1.57		0.28			1.70			0.27			13.78		53.51
D9905XT1	8.02	15.81			2.11			9.32			2.05		0.96		2.00			0.37			2.38			0.48		1.36		0.22			1.43			0.24			14.04		60.77
D9906XT1	4.58	10.04			1.61			7.44			1.93		0.85		1.88			0.36			2.44			0.50		1.41		0.24			1.57			0.26			11.58		46.69
样品编号	微量元素w_B/10^-6
样品编号	Rb		Ba			Th			U			Ta		Nb			La		Ce			Sr			Nd		Zr			Hf			Sm			Yb		Lu
D4821WL1	16.62		208.7			0.21			0.16			0.17		1.66			4.32		9.83			376.5			7.62		63.39			1.93			1.99			1.54		0.24
D4831WL1	13.22		164.7			0.25			0.14			0.19		1.57			3.84		8.44			396.8			6.66		43.62			1.33			1.77			1.47		0.25
D4841WL1	19.69		240.2			0.39			0.20			0.25		1.98			5.22		11.32			383.2			8.56		51.09			1.65			2.19			1.70		0.27
D9905WL1	29.75		226.9			1.06			0.29			0.25		4.24			8.02		15.81			438.2			9.32		58.30			1.67			2.05			1.43		0.24
D9906WL1	13.83		186.0			0.26			0.19			0.24		1.69			4.58		10.04			392.3			7.44		60.27			1.98			1.93			1.57		0.26

样品编号	主量元素w_B/%
样品编号	SiO₂			Al₂O₃			TiO₂			Fe₂O₃			FeO			MnO				MgO			CaO			Na₂O			K₂O			P₂O₅			烧失量				∑
D4821YQ1	47.21			19.05			1.08			4.11			5.88			0.18				5.16			8.68			2.00			0.88			0.16			5.47				99.87
D4831YQ1	48.38			18.69			0.89			4.35			4.65			0.17				4.47			9.49			2.55			0.69			0.10			5.45				99.89
D4841YQ1	47.69			19.26			0.98			3.70			5.65			0.17				4.99			8.36			2.45			0.98			0.14			5.52				99.87
D9905YQ1	50.14			20.70			0.90			3.13			4.47			0.13				2.94			6.94			3.64			1.55			0.15			5.20				99.90
D9906YQ1	47.16			18084			1.02			4.03			5.55			0.18				4.86			9.24			2.42			0.70			0.11			5.76				99.88
样品编号	稀土元素w_B/10^-6
样品编号	La	Ce			Pr			Nd			Sm		Eu		Gd			Tb			Dy			Ho		Er		Tm			Yb			Lu			Y		∑REE
D4821XT1	4.32	9.83			1.60			7.62			1.99		0.82		1.99			0.39			2.57			0.51		1.40		0.24			1.54			0.24			12.11		47.17
D4831XT1	3.84	8.44			1.42			6.66			1.77		0.78		1.73			0.36			2.41			0.48		1.35		0.23			1.47			0.25			12.46		43.63
D4841XT1	5.22	11.32			1.85			8.56			2.19		0.87		2.12			0.42			2.82			0.55		1.57		0.28			1.70			0.27			13.78		53.51
D9905XT1	8.02	15.81			2.11			9.32			2.05		0.96		2.00			0.37			2.38			0.48		1.36		0.22			1.43			0.24			14.04		60.77
D9906XT1	4.58	10.04			1.61			7.44			1.93		0.85		1.88			0.36			2.44			0.50		1.41		0.24			1.57			0.26			11.58		46.69
样品编号	微量元素w_B/10^-6
样品编号	Rb		Ba			Th			U			Ta		Nb			La		Ce			Sr			Nd		Zr			Hf			Sm			Yb		Lu
D4821WL1	16.62		208.7			0.21			0.16			0.17		1.66			4.32		9.83			376.5			7.62		63.39			1.93			1.99			1.54		0.24
D4831WL1	13.22		164.7			0.25			0.14			0.19		1.57			3.84		8.44			396.8			6.66		43.62			1.33			1.77			1.47		0.25
D4841WL1	19.69		240.2			0.39			0.20			0.25		1.98			5.22		11.32			383.2			8.56		51.09			1.65			2.19			1.70		0.27
D9905WL1	29.75		226.9			1.06			0.29			0.25		4.24			8.02		15.81			438.2			9.32		58.30			1.67			2.05			1.43		0.24
D9906WL1	13.83		186.0			0.26			0.19			0.24		1.69			4.58		10.04			392.3			7.44		60.27			1.98			1.93			1.57		0.26

测点	w_B/10^-6		Th/U	同位素比值						年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
1	10	338	0.80	0.026 0	0.000 4	0.184 0	0.006 5	0.052 1	0.001 9	165	2	171	6	300	81
2	22	708	1.02	0.025 5	0.000 3	0.184 7	0.004 9	0.052 6	0.001 4	163	2	172	4	309	58
3	17	571	0.84	0.025 5	0.000 4	0.184 3	0.009 5	0.052 5	0.002 8	162	3	172	8	306	122
4	23	728	1.02	0.026 1	0.000 4	0.197 5	0.007 2	0.055 0	0.002 0	166	3	183	6	413	84
5	20	652	0.91	0.025 8	0.000 3	0.190 0	0.006 3	0.052 9	0.001 5	164	2	177	5	324	65
6	16	549	0.82	0.025 4	0.000 4	0.156 2	0.006 8	0.044 7	0.001 9	161	3	147	6	203	65
7	26	805	1.16	0.026 1	0.000 3	0.185 5	0.005 1	0.051 7	0.001 4	166	2	173	4	333	61
8	18	542	0.90	0.026 0	0.000 4	0.220 5	0.007 1	0.061 8	0.002 0	166	3	202	6	665	75
9	18	529	1.10	0.026 0	0.000 3	0.181 3	0.006 0	0.050 3	0.001 5	166	2	169	5	206	36
10	21	640	0.97	0.025 6	0.000 4	0.198 3	0.009 2	0.055 9	0.002 4	163	3	184	8	450	94
11	20	579	1.17	0.025 8	0.000 3	0.182 0	0.005 5	0.051 2	0.001 5	164	2	170	5	256	67
12	14	448	0.71	0.026 0	0.000 3	0.176 7	0.005 5	0.049 6	0.001 5	166	2	165	5	176	70
13	13	378	0.87	0.025 8	0.000 3	0.191 1	0.008 7	0.053 8	0.002 4	164	2	178	7	361	100
14	17	520	1.02	0.025 3	0.000 3	0.173 7	0.004 8	0.050 1	0.001 4	161	2	163	4	198	65
15	15	466	0.88	0.025 5	0.000 3	0.172 0	0.004 9	0.049 1	0.001 4	162	2	161	4	154	65
16	12	344	0.92	0.026 2	0.000 4	0.188 7	0.007 6	0.052 0	0.001 9	167	2	176	7	283	83
17	19	508	1.20	0.026 6	0.000 3	0.185 7	0.005 5	0.050 6	0.001 4	169	2	173	5	220	65
18	23	652	1.23	0.025 8	0.000 3	0.176 4	0.004 3	0.049 8	0.001 2	164	2	165	4	183	56
19	20	569	1.06	0.026 4	0.000 3	0.183 2	0.004 9	0.050 3	0.001 2	168	2	171	4	209	56
20	27	738	1.25	0.026 3	0.000 3	0.186 5	0.005 0	0.051 5	0.001 3	167	2	174	4	261	56

测点	w_B/10^-6		Th/U	同位素比值						年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
1	10	338	0.80	0.026 0	0.000 4	0.184 0	0.006 5	0.052 1	0.001 9	165	2	171	6	300	81
2	22	708	1.02	0.025 5	0.000 3	0.184 7	0.004 9	0.052 6	0.001 4	163	2	172	4	309	58
3	17	571	0.84	0.025 5	0.000 4	0.184 3	0.009 5	0.052 5	0.002 8	162	3	172	8	306	122
4	23	728	1.02	0.026 1	0.000 4	0.197 5	0.007 2	0.055 0	0.002 0	166	3	183	6	413	84
5	20	652	0.91	0.025 8	0.000 3	0.190 0	0.006 3	0.052 9	0.001 5	164	2	177	5	324	65
6	16	549	0.82	0.025 4	0.000 4	0.156 2	0.006 8	0.044 7	0.001 9	161	3	147	6	203	65
7	26	805	1.16	0.026 1	0.000 3	0.185 5	0.005 1	0.051 7	0.001 4	166	2	173	4	333	61
8	18	542	0.90	0.026 0	0.000 4	0.220 5	0.007 1	0.061 8	0.002 0	166	3	202	6	665	75
9	18	529	1.10	0.026 0	0.000 3	0.181 3	0.006 0	0.050 3	0.001 5	166	2	169	5	206	36
10	21	640	0.97	0.025 6	0.000 4	0.198 3	0.009 2	0.055 9	0.002 4	163	3	184	8	450	94
11	20	579	1.17	0.025 8	0.000 3	0.182 0	0.005 5	0.051 2	0.001 5	164	2	170	5	256	67
12	14	448	0.71	0.026 0	0.000 3	0.176 7	0.005 5	0.049 6	0.001 5	166	2	165	5	176	70
13	13	378	0.87	0.025 8	0.000 3	0.191 1	0.008 7	0.053 8	0.002 4	164	2	178	7	361	100
14	17	520	1.02	0.025 3	0.000 3	0.173 7	0.004 8	0.050 1	0.001 4	161	2	163	4	198	65
15	15	466	0.88	0.025 5	0.000 3	0.172 0	0.004 9	0.049 1	0.001 4	162	2	161	4	154	65
16	12	344	0.92	0.026 2	0.000 4	0.188 7	0.007 6	0.052 0	0.001 9	167	2	176	7	283	83
17	19	508	1.20	0.026 6	0.000 3	0.185 7	0.005 5	0.050 6	0.001 4	169	2	173	5	220	65
18	23	652	1.23	0.025 8	0.000 3	0.176 4	0.004 3	0.049 8	0.001 2	164	2	165	4	183	56
19	20	569	1.06	0.026 4	0.000 3	0.183 2	0.004 9	0.050 3	0.001 2	168	2	171	4	209	56
20	27	738	1.25	0.026 3	0.000 3	0.186 5	0.005 0	0.051 5	0.001 3	167	2	174	4	261	56

分析点	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	T_DM ^c/Ma
1	165.3	0.188 79	0.007 30	0.283 09	0.000 03	0.283 07	11.22	14.05	276.4	312.9
2	162.5	0.353 27	0.012 79	0.283 17	0.000 05	0.283 13	14.00	16.19	171.8	172.7
3	162.3	0.225 04	0.008 37	0.283 19	0.000 03	0.283 16	14.76	17.43	108.0	92.6
4	166.2	0.327 25	0.011 58	0.283 16	0.000 05	0.283 12	13.74	16.12	178.4	180.1
5	164.1	0.291 45	0.010 84	0.283 23	0.000 03	0.283 20	16.31	18.74	32.5	9.1
6	161.4	0.240 62	0.008 91	0.283 10	0.000 04	0.283 07	11.52	14.11	276.2	306.1
7	166.0	0.364 32	0.013 33	0.283 14	0.000 04	0.283 10	13.10	15.28	229.5	234.1
9	165.7	0.312 84	0.011 77	0.283 17	0.000 03	0.28313	14.01	16.36	164.6	164.5
10	163.1	0.313 97	0.011 26	0.283 22	0.000 05	0.283 18	15.76	18.13	64.1	48.3
11	164.5	0.309 28	0.011 63	0.283 17	0.000 03	0.283 13	13.94	16.29	167.4	167.8
12	165.6	0.215 71	0.008 27	0.283 11	0.000 03	0.283 09	12.05	14.78	243.6	266.0
13	164.3	0.207 81	0.007 83	0.283 16	0.000 03	0.283 14	13.69	16.45	159.0	157.3
14	161. 1	0.207 68	0.007 90	0.283 12	0.000 03	0.283 10	12.31	15.00	228.1	248.5
15	162.2	0.210 03	0.007 96	0.283 17	0.000 03	0.283 14	13.90	16.61	149.4	145.6
16	166.7	0.237 82	0.008 88	0.283 15	0.000 03	0.283 12	13.32	16.01	183.6	188.1
17	169.5	0.323 59	0.011 63	0.283 22	0.000 05	0.283 19	15.98	18.40	52.2	35.3
18	164.4	0.244 99	0.009 09	0.283 11	0.000 03	0.283 09	12.10	14.72	247.9	269.0
19	167.8	0.336 52	0.012 09	0.283 14	0.000 05	0.283 10	13.11	15.45	218.4	224.6
20	167.1	0.223 47	0.008 20	0.283 06	0.000 04	0.283 03	10.20	12.97	335.4	384.3

西藏冈底斯南缘中侏罗世辉长闪长岩锆石U-Pb定年和Lu-Hf同位素组成及其构造意义

Zircon U-Pb Age and Lu-Hf Isotopes for Middle Jurassic Gabbro-diorite in Southern Margin of Gangdese Magmatic Belt and Its Tectonic Implications

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