藏东江达中石炭世弧火山岩的厘定及其构造意义

闫国川; 王保弟; 刘函; 李小波; 周放

doi:10.3799/dqkx.2018.546

藏东江达中石炭世弧火山岩的厘定及其构造意义

doi: 10.3799/dqkx.2018.546

闫国川^1,2,,
王保弟^2, ,,
刘函²,
李小波²,
周放^1,2

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质调查局成都地质调查中心, 四川成都 610081

基金项目:

国家自然科学基金项目 41773026

国家自然科学基金项目 41603038

国家重点研发计划项目 2015CB452601

中国地质调查局项目 DD20160016

详细信息

作者简介:
闫国川(1988-), 男, 硕士研究生, 主要从事地球化学研究

通讯作者:
王保弟

中图分类号: P597
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- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2018-04-03
- 刊出日期: 2018-08-15

Delineation of Middle Carboniferous Arc Volcanic Rocks in Jomda Area, Eastern Tibet and Its Tectonic Implications

Yan Guochuan^{1,2
,},
Wang Baodi^{2
, ,},
Liu Han²,
Li Xiaobo²,
Zhou Fang^1,2

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Chengdu Center of China Geological Survey, Chengdu 610081, China

摘要

摘要: 金沙江特提斯洋盆是三江地区重要的洋盆之一，然而目前对于金沙江洋壳俯冲时限认识不一，弧火山岩对限定洋壳的俯冲消减过程具有重要意义.在西藏东部江达地区首次识别出一套中石炭世晚期的火山岩，主要岩性为玄武岩及安山岩，安山岩锆石U-Pb年龄为332±3.3 Ma（MSWD=2，n=14），指示该火山活动为中石炭世晚期.江达火山岩SiO₂含量为45.65%~55.73%，具有高Al₂O₃含量（15.48%~16.79%），TiO₂含量为0.82%~1.12%，富Na低K；轻重稀土分异明显，无δEu异常，强不相容元素Th、U等富集，高场强元素Nb、Ta等亏损，具有弧火山岩的地球化学性质.安山岩锆石ε_Hf（t）值为较均一的正值（+11.0~+15.6），指示岩浆源区为受到富集组分影响的岩石圈地幔.研究表明江达中石炭世晚期火山岩形成于岛弧的构造环境，其火山活动与金沙江特提斯洋壳俯冲消减过程有关；结合区域地质资料认为金沙江特提斯洋壳在332 Ma之前已经开始了俯冲消减活动，进而为金沙江特提斯洋演化过程提供了岩石学证据.
- 江达-德钦-维西火山弧 /
- 金沙江特提斯洋 /
- 岛弧玄武岩 /
- 中石炭世 /
- 江达 /
- 地球化学 /
- 地质年代学
Abstract: The Jinshajiang Tethys is one of the most important ocean basins in the Sanjiang region.However, it is not clear when the oceanic subduction started.The research of arc volcanic rock is significant to constrain the subduction process of the oceanic plate.This paper reports the Late Middle Carboniferous volcanic rocks in Jomda area, eastern Tibet, which are dominated by basalts and andesites.Zircon U-Pb age results show they were formed at 332±3.3 Ma.The arc volcanic rocks have SiO₂ contents of 45.65%-55.73%, Al₂O₃ contents of 15.48%-16.79%, TiO₂ contents of 0.82%-1.12%, and have high Na/K ratios.They show obvious differentiation between LREE and HREE, and without Eu anomaly.They are enriched in strong incompatible trace elements, such as Th and U, and depleted in high field strength element, such as Nb and Ta.The zircons from basalts have positive ε_Hf(t) values(+11.0 to +15.6), which indicates that the magma source might be the enriched lithosphere mantle.It is believed that Late Middle Carboniferous volcanic rocks were formed at the island arc tectonic enviorment, which is related to subduction of Jinshajiang Tethys ocean.Combining with the regional geological data, we propose that the subduction of the Jinshajiang Tethys ocean have started before 332 Ma.This study provides a lithology evidence for the evolution of Jinshajiang Tethys ocean.
- Jomda-Deqin-Weixi volcanic arc /
- Jinshajiang Tethys ocean /
- island arc basalt /
- Middle Carboniferous /
- Jomda area /
- geochemistry /
- geochronology

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图 1 金沙江洋盆的构造格架(a)和江达县车所地区地质简图(b)

据西藏自治区地质调查院，2007.1:250 000江达幅区域地质调查报告

Fig. 1. The geotectonic outline of Jinshajiang oceanic basin (a) and simplified geological map of Chesuo area in Jomda County (b)

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图 2 江达火山岩的野外特征及显微照片(正交偏光)(a~f)

Pl.斜长石

Fig. 2. Field characteristics and photomicrograph of the volcanic rock in in Jomda County (a-f)

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图 3 江达安山岩样品(15JD-04)锆石CL图像

实线为锆石年龄打点处，虚线为锆石Lu-Hf同位素打点处

Fig. 3. Cathodoluminescence image from sample (15JD-04) of the andesite in the Jomda area

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图 4 江达安山岩样品(15JD-04)锆石U-Pb谐和图

Fig. 4. U-Pb concordia diagram of representative zircon grains of the andesite in the Jomda area

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图 5 江达火山岩Zr/TiO₂-Nb/Y分类图解

底图据Winchester and Floyd(1977)

Fig. 5. Zr/TiO₂-Nb/Y classification diagram for the volcanic rock in the Jomda area

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图 6 江达火山岩微量元素原始地幔标准化蛛网图(a)和稀土元素球粒陨石标准化配分曲线(b)

据Sun and McDonough(1989)

Fig. 6. The PM-normalized trace element spider diagram (a) and chondrite-normalized REE pattern (b) of the volcanic rock in the Jomda area

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图 7 江达安山岩(15JD-04)锆石ε_Hf(t)-t图解

Fig. 7. ε_Hf(t)-t diagram of zircons from sample 15JD-04 of the andesite in the Jomda area

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图 8 江达火山岩的Hf/3-Th-Ta图解

底图据Jochum et al.(1991).A.N型洋脊玄武岩; B.E型洋脊玄武岩+板内拉斑玄武岩; C.板内碱性玄武岩; D.岛弧钙碱性玄武岩; E.岛弧拉斑玄武岩

Fig. 8. Hf/3-Th-Ta diagram of the volcanic rock in the Jomda area

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图 9 江达火山岩的La/Nb-Ta图解

底图据李曙光(1993).IAB.岛弧火山岩; MORB.洋中脊玄武岩; OIB.洋岛玄武岩

Fig. 9. La/Nb-Ta diagram of the volcanic rock in the Jomda area

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表 1 江达安山岩LA-ICP-MS锆石U-Pb同位素分析结果

Table 1. LA-ICP-MS zircon U-Pb isotope analytical results of the andesite in the Jomda area

测点	含量(10^-6)			Th/U	同位素比值(已扣除普通铅)						年龄(Ma)				谐和度(%)
测点	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度(%)
1	778	4 464	4 484	1.00	0.055	0.002	0.403	0.011	0.053	0.001	344	8	314	8	74
2	261	1 291	1 477	0.87	0.057	0.003	0.404	0.022	0.051	0.001	344	16	322	5	91
3	310	1 555	1 737	0.89	0.060	0.003	0.431	0.019	0.052	0.001	364	14	328	4	87
4	320	2 352	1 748	1.35	0.057	0.002	0.416	0.019	0.053	0.001	353	13	333	8	93
5	270	2 280	1 369	1.67	0.055	0.003	0.398	0.023	0.053	0.001	340	17	332	5	97
6	343	1 766	1 975	0.89	0.053	0.002	0.376	0.016	0.051	0.001	324	11	322	4	98
7	478	3 201	2 621	1.22	0.057	0.002	0.417	0.013	0.053	0.001	354	9	332	3	91
8	378	3 046	2 069	1.47	0.050	0.002	0.366	0.014	0.052	0.001	317	10	329	3	99
9	254	2 352	1 322	1.78	0.050	0.002	0.366	0.016	0.053	0.001	317	12	332	4	95
10	128	748	704	1.06	0.069	0.004	0.521	0.033	0.054	0.001	426	22	340	6	77
11	402	2 814	2 093	1.34	0.077	0.004	0.562	0.029	0.053	0.001	453	19	330	4	68
12	446	2 248	2 511	0.90	0.052	0.002	0.393	0.013	0.055	0.001	337	9	342	4	99
13	419	2 361	2 297	1.03	0.057	0.002	0.425	0.015	0.054	0.001	359	10	336	4	93
14	406	2 691	2 230	1.21	0.053	0.002	0.393	0.016	0.054	0.001	337	11	336	4	99
15	687	4 166	3 790	1.10	0.055	0.002	0.406	0.011	0.054	0.000	346	8	336	3	97
16	222	1 328	1 033	1.29	0.054	0.003	0.404	0.022	0.054	0.001	344	16	340	5	99
17	194	1568	899	1.74	0.064	0.003	0.461	0.024	0.053	0.001	385	16	331	6	71
18	299	1 680	1 765	0.95	0.059	0.002	0.414	0.016	0.051	0.001	352	12	319	3	74
19	301	2 259	1 704	1.33	0.054	0.002	0.393	0.015	0.053	0.001	336	11	331	4	95
20	551	4 753	2 953	1.61	0.057	0.002	0.403	0.011	0.051	0.001	344	7	308	5	79

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表 2 江达安山岩样品(15JD-04)锆石Hf同位素组成

Table 2. Zircon Hf isotopic compositions from sample 15JD-04 of the andesite in the Jomda area

测点号	年龄(Ma)	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	1σ	t_DM1
15JD-04-02	322	0.003 501	0.283 039	0.000 059	9.43	15.6	2.18	353
15JD-04-03	328	0.005 328	0.282 931	0.000 113	5.63	11.8	4.05	514
15JD-04-04	333	0.004 072	0.282 919	0.000 021	5.21	11.6	0.93	514
15JD-04-05	332	0.002 916	0.282 922	0.000 024	5.32	12.4	1.00	492
15JD-04-06	322	0.003 372	0.282 969	0.000 023	6.98	13.5	0.99	427
15JD-04-07	332	0.002 826	0.282 900	0.000 023	4.51	11.3	0.99	525
15JD-04-08	329	0.002 593	0.282 991	0.000 031	7.74	14.4	1.23	386
15JD-04-09	332	0.005 759	0.282 912	0.000 037	4.94	11.0	1.45	552
15JD-04-12	342	0.003 020	0.282 993	0.000 026	7.81	14.6	1.08	388
15JD-04-13	336	0.003 291	0.282 941	0.000 033	5.99	12.6	1.30	469
15JD-04-14	336	0.004 348	0.282 957	0.000 051	6.54	13.0	1.93	459
15JD-04-15	336	0.002 373	0.282 967	0.000 023	6.89	13.8	0.99	419
15JD-04-16	340	0.002 327	0.282 929	0.000 028	5.57	12.5	1.12	474
15JD-04-19	331	0.001 814	0.282 953	0.000 028	6.40	14.1	1.14	433

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表 3 江达火山岩主量元素(%)、微量元素(10^-6)和稀土元素(10^-6)分析结果

Table 3. Major elements (%), trace elements (10^-6) and rare earth elements (10^-6) results of the volcanic rock in the Jomda area

样品号	15JD-01	15JD-02	15JD-03	15JD-04
SiO₂	47.91	46.15	45.65	55.73
TiO₂	0.97	0.83	0.82	1.12
Al₂O₃	15.51	16.79	16.47	15.48
Fe₂O₃T	10.63	10.21	9.50	9.84
MnO	0.13	0.10	0.15	0.09
MgO	8.20	9.66	5.50	4.98
CaO	8.04	3.86	10.93	2.00
Na₂O	4.00	4.52	4.30	3.14
K₂O	0.06	0.28	0.07	3.10
P₂O₅	0.21	0.17	0.16	0.30
烧失量	4.33	7.56	6.36	4.59
总量	99.99	100.13	99.91	100.37
Sc	31.7	32.3	32.7	26.4
Ti	5791	4982	5028	6815
V	198	219	192	158
Cr	401	392	227	28.0
Mn	994	771	1214	702
Co	39.6	40.2	38.4	21.6
Ni	115	130	73.1	4.38
Cu	51.0	5.04	73.8	22.2
Zn	123	167	97.0	106
Ga	16.8	15.4	16.5	18.3
Ge	2.58	3.37	2.22	2.47
Rb	1.84	5.98	1.66	126
Sr	60.7	113	124	88.4
Y	16.5	13.7	14.0	22.0
Zr	66.3	45.5	47.5	117
Nb	5.55	4.34	3.75	12.2
Cs	0.17	1.82	0.76	4.51
Ba	53.7	120	35.1	228
La	12.0	10.4	9.10	20.0
Ce	24.2	21.9	19.0	39.9
Pr	2.98	2.72	2.38	4.84
Nd	12.2	11.1	10.0	19.2
Sm	2.72	2.53	2.37	4.09
Eu	0.86	0.87	0.84	1.21
Gd	2.80	2.57	2.43	4.07
Tb	0.46	0.41	0.4	0.64
Dy	2.81	2.37	2.37	3.79
Ho	0.59	0.50	0.50	0.80
Er	1.69	1.39	1.43	2.22
Tm	0.25	0.20	0.21	0.33
Yb	1.59	1.29	1.35	2.11
Lu	0.26	0.21	0.22	0.34
Hf	1.81	1.37	1.40	3.08
Ta	0.39	0.31	0.25	0.79
Pb	2.64	1.32	5.29	11.7
Th	3.64	3.22	2.57	8.31
U	1.00	0.92	0.92	2.05
∑REE	65.4	58.5	52.6	104

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