早侏罗世新特提斯洋俯冲作用——来自松多高镁闪长岩锆石U-Pb定年及Hf同位素的制约

张雨轩; 解超明; 于云鹏; 张红雨; 董宇超; 王斌

早侏罗世新特提斯洋俯冲作用——来自松多高镁闪长岩锆石U-Pb定年及Hf同位素的制约

1.
吉林大学地球科学学院, 吉林长春 130061

2.
中国地质大学, 北京 100083

基金项目:
国家青年科学基金项目《青藏高原羌塘南部埃迪卡拉纪地层研究》(批准号:41602230)、《班公湖-怒江洋早白垩世构造演化:来自复理石沉积的制约》(批准号:41702227)、中国地质调查局项目《冈底斯-喜马拉雅铜矿资源基地调查》(编号:DD20160015)、《班公湖-怒江成矿带铜多金属矿资源基地调查》(编号:DD20160026)和中国博士后基金会面上基金58批

详细信息

作者简介: 张雨轩(1993-), 男, 在读硕士生, 构造地质学。E-mail:980397891@qq.com

通讯作者: 解超明(1983-), 男, 博士, 副教授, 构造地质学。E-mail:xcmxcm1983@126.com

中图分类号: P534.52;P597⁺.3

收稿日期: 2018-02-18

修回日期: 2018-05-06

刊出日期: 2018-08-15

The Early Jurassic subduction of Neo-Tethyan oceanic slab: Constraints from zircon U-Pb age and Hf isotopic compositions of Sumdo high-Mg diorite

1.
College of Earth Science, Jilin University, Changchun 130061, Jilin, China

2.
China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: XIE Chaoming, xcmxcm1983@126.com

Received Date: 18 February 2018

Revised Date: 06 May 2018

Publish Date: 15 August 2018

摘要

摘要:
冈底斯岩浆岩带中东部松多地区新发现的高镁闪长岩对于探讨青藏高原新特提斯俯冲演化历史具有重要意义。通过松多高镁闪长岩的LA-ICP-MS锆石U-Pb年龄、锆石Hf同位素和全岩地球化学组成的研究，表明松多闪长岩的锆石U-Pb年龄加权平均值为186.8±1.3Ma。该类岩石具有高硅、高镁的特点，SiO₂含量为54.17%~58.81%，MgO含量较高，介于6.26%~7.29%之间，Mg^#值介于64~67之间，Cr和Ni含量高。该岩石富集轻稀土元素，具有平滑右倾的稀土元素配分曲线及弱负Eu异常。富集Rb、Ba、Pb、K等大离子亲石元素，亏损Nb、Ta、Ti等高场强元素。锆石负ε_Hf（t）值（-5~-14.3）及远大于其侵入年龄的古老Hf模式年龄（1543~2129Ma），揭示松多早侏罗世闪长岩经历了古老地壳物质的部分熔融。Sr/Y-Y和（La/Yb）_N-Yb_N判别图解显示，其形成可能与赞岐岩的岩浆作用过程相似，形成于消减带之上的地幔楔环境。综合研究表明，松多地区在早侏罗世处于雅鲁藏布新特提斯洋板片向欧亚大陆俯冲的活动陆缘构造背景。
- 冈底斯 /
- 松多地区 /
- 早侏罗世 /
- LA-ICP-MS锆石U-Pb定年 /
- Hf同位素
Abstract:
The high-Mg diorite newly discovered in Sumdo area in the eastern part of the Gangdise magmatic belt is of importance for investigating the evolution history of the subduction of Neo-Tethyan oceanic slab of Tibet. This paper reports LA-ICP-MS zircon U-Pb ages, zircon Hf isotopic and whole-rock major and trace element compositions of the high-Mg diorite. LA-ICP-MS zircon U-Pb isotopic dating indicates that the diorite was emplaced at 186.8±1.3Ma. It is characterized by high content of SiO₂ (54.17%~58.81%), MgO (6.26%~7.29%), Mg^# (64~67), Cr (294×10^-6~373×10^-6) and Ni (42×10^-6~50×10^-6). It is also characterized by smooth gently right-inclined REE patterns with slight enrichment of LREE and a little negative Eu anomaly. The large ion lithophile elements (LILEs) such as Rb, Ba, Pb, K are enriched, and the high field strength elements (HFSEs) such as Nb, Ta, Ti are depleted. LuHf isotopic study demonstrates that its ε_Hf(t) values vary between -5 and -14.3, and the ancient zircon Hf crustal modal ages vary greatly from 1543Ma to 2129Ma, which indicates that the formation of Sumdo diorites resulted from partial melting of ancient crustal rocks. The discrimination diagrams of Sr/Y-Y and (La/Yb)_N-Yb_N show that the high-Mg diorites were likely formed in a mantle wedge setting similar to the magmatic process of sanukitie. The comprehensive studies show that the Sumdo area was located in an active continental margin setting and affected by the subduction of the Yarlung Zangbo Neo-Tethyan oceanic slab towards Eurasia plate before Early Jurassic.
- Tibetan Plateau /
- Sumdo /
- Early Jurassic /
- LA-ICP-MS zircon U-Pb dating /
- Hf isotope

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图 1 冈底斯东段构造简图及其早侏罗世岩浆岩分布^[3]

Figure 1.

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图 2 西藏松多地区地质图及松多闪长岩出露位置

Figure 2.

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图 3 西藏松多地区闪长岩野外露头及显微特征

Figure 3.

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图 4 松多闪长岩锆石阴极发光（CL）照片(实线圈为U-Pb测点，虚线圈为Lu-Hf同位素测点)

Figure 4.

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图 5 松多闪长岩锆石稀土元素球粒陨石标准化配分模式（a）锆石U-Pb谐和图（b）和年龄直方图（c）

Figure 5.

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图 6 松多闪长岩地球化学图解

Figure 6.

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图 7 松多闪长岩稀土元素球粒陨石标准化曲线^[36-37]（a）及微量元素标准化蛛网图^[37]（b）

Figure 7.

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图 8 松多闪长岩锆石t-ε_Hf（t）分布图

Figure 8.

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图 9 松多闪长岩高镁安山岩分类图解^[39]

Figure 9.

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图 10 松多闪长岩Y-Nb(a)和（Y+Nb）-Rb（b）构造环境判别图

Figure 10.

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图 11 松多闪长岩Nb-Zr(a)和Ta/Yb-Th/Yb(b)构造环境判别图

Figure 11.

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表 1 松多闪长岩（ST76）LA-ICP-MS锆石U-Th-Pb分析结果

Table 1. LA-ICP-MS U-Th-Pb analyses of zircons from the diorite (ST76) in Sumdo area

点号	含量/10^-6		Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
点号	Th	U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	206	580	0.36	0.0498	0.0012	0.2006	0.0048	0.0292	0.0003	186	34	186	4	186	2
2	349	930	0.38	0.0498	0.0011	0.2010	0.0043	0.0293	0.0003	185	29	186	4	186	2
3	238	650	0.37	0.0498	0.0012	0.2011	0.0049	0.0293	0.0003	187	36	186	4	186	2
4	193	303	0.64	0.0491	0.0017	0.1974	0.0067	0.0291	0.0004	154	56	183	6	185	2
5	220	495	0.44	0.0522	0.0013	0.2138	0.0051	0.0297	0.0004	294	34	197	4	189	2
6	303	776	0.39	0.0508	0.0012	0.2047	0.0046	0.0292	0.0003	233	31	189	4	186	2
7	216	580	0.37	0.0499	0.0013	0.2002	0.0051	0.0291	0.0003	191	38	185	4	185	2
8	320	657	0.49	0.0526	0.0020	0.2091	0.0077	0.0288	0.0004	313	90	193	6	183	2
9	218	547	0.40	0.0493	0.0012	0.1994	0.0049	0.0293	0.0004	163	35	185	4	186	2
10	352	700	0.50	0.0524	0.0012	0.2121	0.0050	0.0293	0.0003	304	33	195	4	186	2
11	619	916	0.68	0.0526	0.0011	0.2114	0.0046	0.0291	0.0003	312	28	195	4	185	2
12	192	339	0.57	0.0504	0.0016	0.2112	0.0067	0.0304	0.0004	212	50	195	6	193	2
13	285	659	0.43	0.0514	0.0013	0.2072	0.0051	0.0293	0.0003	257	35	191	4	186	2
14	558	722	0.77	0.0512	0.0024	0.2102	0.0096	0.0298	0.0004	251	111	194	8	189	2
15	542	777	0.70	0.0512	0.0013	0.2102	0.0051	0.0298	0.0004	249	34	194	4	189	2
16	498	830	0.60	0.0511	0.0013	0.2081	0.0051	0.0296	0.0004	244	35	192	4	188	2

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表 2 松多闪长岩(ST76)锆石LA-ICP-MS原位稀土元素分析结果

Table 2. The trace element compositions of the zircons in the diorite (ST76) in Sumdo area by LA-ICP-MS

10^-6
点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE
01	1.06	13.52	0.65	2.43	2.93	0.82	14.58	5.99	84.12	35.28	176.75	50.02	653.12	173.49	1215
02	0.04	19.89	0.03	0.69	2.60	1.12	16.78	7.60	106.02	46.08	228.32	63.78	826.25	216.30	1215
03	0.03	15.42	0.03	0.49	1.58	0.86	10.71	4.76	68.08	31.25	162.83	47.74	640.72	181.13	1169
04	0.03	11.07	0.03	0.67	1.36	0.68	7.30	2.67	35.69	14.80	73.49	21.68	299.68	86.18	559
05	0.03	12.04	0.02	0.29	0.98	0.51	6.28	2.42	34.33	15.12	77.90	23.49	325.66	93.27	597
06	9.93	37.44	2.87	14.47	5.09	1.32	17.55	7.02	95.91	40.46	202.72	56.38	731.30	195.07	1424
07	0.05	13.19	0.03	0.39	1.45	0.71	8.26	3.58	50.99	22.82	121.19	36.10	502.57	145.96	914
08	0.04	19.79	0.05	0.69	2.05	1.10	12.39	5.08	71.78	31.91	167.15	50.52	675.85	188.40	1235
09	0.04	15.96	0.03	0.54	1.42	0.79	9.14	3.76	54.75	24.74	130.63	38.96	543.96	162.47	996
10	0.05	18.40	0.04	1.41	3.51	1.23	19.64	7.75	104.23	42.02	203.29	55.23	692.35	178.56	1338
11	2.73	25.86	0.81	4.94	3.28	1.19	14.93	5.51	73.71	29.84	146.62	40.51	524.2	140.75	1026
12	0.16	9.13	0.08	1.81	4.33	1.22	20.39	7.44	91.56	34.18	156.2	40.25	478.05	120.97	978
13	16.65	50.20	4.87	25.11	7.22	1.59	16.45	5.73	75.11	30.49	150.33	42.01	550.88	145.16	1135
14	0.20	21.11	0.12	2.40	4.81	1.57	22.51	8.24	104.69	41.36	196.11	52.39	661.73	163.38	1295
15	0.03	14.71	0.04	0.73	2.18	0.89	12.93	4.98	66.21	26.29	122.53	32.55	413.27	106.38	819
16	4.21	27.21	1.47	7.51	3.62	1.03	10.93	3.97	50.45	21.12	108.11	30.39	402.18	115.79	804

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表 3 松多闪长岩(ST76)LA-ICP-MS锆石Lu-Hf同位素组成

Table 3. The Lu-Hf isotope compositions of the zircons in the diorite (ST76) in Sumdo area as measured by LA-ICP-MS

点号	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	T_DM1	T_DM2	f_Lu/Hf
01	186	0.034757	0.000514	0.001385	0.000030	0.282468	0.000028	-10.8	-6.9	1121	1662	-0.96
02	186	0.020124	0.000198	0.000731	0.000008	0.282470	0.000018	-10.7	-6.7	1099	1652	-0.98
03	186	0.069570	0.000895	0.002615	0.000053	0.282446	0.000026	-11.5	-7.8	1191	1719	-0.92
04	185	0.039694	0.000791	0.001311	0.000024	0.282307	0.000021	-16.5	-12.6	1347	2021	-0.96
05	189	0.040310	0.000422	0.001442	0.000009	0.282420	0.000021	-12.5	-8.5	1191	1768	-0.96
06	186	0.021209	0.000292	0.000783	0.000011	0.282519	0.000018	-9.0	-5.0	1032	1543	-0.98
07	185	0.042573	0.001080	0.001651	0.000054	0.282373	0.000023	-14.1	-10.3	1265	1877	-0.95
08	183	0.026939	0.000259	0.000966	0.000007	0.282308	0.000018	-16.4	-12.5	1333	2018	-0.97
09	186	0.025039	0.000459	0.000925	0.000016	0.282489	0.000020	-10.0	-6.1	1078	1611	-0.97
10	186	0.026789	0.000106	0.000917	0.000007	0.282257	0.000019	-18.2	-14.3	1402	2129	-0.97

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表 4 松多闪长岩全岩主量、微量和稀土元素测定结果

Table 4. Major, trace element and REE compositions of the diorite in Sumdo area

样号	ST76-1	ST76-2	ST76-3	ST76-4	ST76-5	ST76-6	样号	ST76-1	ST76-2	ST76-3	ST76-4	ST76-5	ST76-6
SiO₂	58.81	58.10	57.71	54.85	54.17	55.32	Li	87.20	72.26	60.30	31.12	31.46	24.72
TiO₂	0.62	0.65	0.69	0.71	0.67	0.65	P	870.4	794.6	799.4	626.55	565.80	635.40
Al₂O₃	11.20	11.05	11.26	11.90	12.09	11.72	K	29360	24620	28740	16187	15728	17942
TFe₂O₃	7.48	7.82	8.18	8.70	8.58	8.41	Sc	51.98	47.56	51.84	36.98	37.56	39.84
MnO	0.12	0.13	0.13	0.14	0.14	0.13	Ti	5220	4766	5140	4038	4090	4286
MgO	6.26	6.54	7.10	7.29	6.97	6.41	V	275.8	249.2	272.6	238.7	244.1	254.0
CaO	6.98	7.36	6.93	7.45	8.04	7.43	Cr	326.8	294.2	339.8	318.8	329.0	373.4
Na₂O	1.84	1.84	1.62	1.71	1.97	1.91	Mn	1060.8	981.4	1036.8	1157.4	1185.0	1214.0
K₂O	2.06	2.05	2.34	2.49	2.18	2.19	Co	37.80	36.44	39.76	37.60	38.66	42.26
P₂O₅	0.13	0.13	0.13	0.12	0.11	0.12	Ni	43.78	42.66	45.82	42.74	43.60	51.32
烧失量	4.07	3.91	3.48	4.02	4.46	5.10	Cu	62.48	46.38	34.44	56.76	45.56	34.78
总量	99.57	99.58	99.57	99.38	99.38	99.39	Zn	57.86	59.12	54.62	66.37	70.42	61.22
Na₂O+K₂	3.90	3.89	3.96	4.20	4.14	4.10	Ga	17.38	15.47	15.53	14.07	14.00	13.83
A/CNK	0.62	0.59	0.63	0.63	0.60	0.62	Rb	29.74	63.58	59.12	76.92	74.72	97.10
A/NK	2.13	2.11	2.16	2.16	2.16	2.13	Sr	441.6	510.0	510.8	440.0	440.0	338.4
La	19.91	17.09	17.85	17.47	16.92	16.85	Y	19.86	17.26	19.53	16.20	15.96	17.54
Ce	43.14	37.72	39.32	37.78	36.74	36.96	Zr	121.46	108.64	107.82	103.66	103.88	99.44
Pr	5.17	4.52	4.77	4.62	4.47	4.62	Nb	7.49	6.73	6.82	6.47	6.39	6.33
Nd	19.94	17.40	18.88	17.28	16.71	17.64	Cs	2.94	2.41	3.29	2.52	2.33	3.06
Sm	4.20	3.67	4.05	3.62	3.49	3.76	Ba	448.0	435.8	374.6	425.2	454.8	383.4
Eu	1.06	0.93	0.99	0.92	0.90	0.95	Hf	2.86	2.61	2.64	2.62	2.60	2.34
Gd	3.73	3.28	3.64	3.40	3.33	3.63	Ta	0.45	0.41	0.42	0.43	0.42	0.41
Tb	0.54	0.48	0.54	0.49	0.48	0.52	Pb	7.79	8.56	7.12	9.07	10.71	8.80
Dy	3.24	2.86	3.21	3.01	2.96	3.22	Th	6.85	6.32	5.79	7.41	7.56	6.80
Ho	0.63	0.57	0.63	0.62	0.61	0.65	U	1.27	1.17	1.12	1.58	1.59	1.50
Er	1.83	1.63	1.83	1.73	1.70	1.84	Ta/Yb	0.27	0.28	0.26	0.27	0.27	0.24
Tm	0.26	0.23	0.25	0.26	0.25	0.27	Th/Yb	4.07	4.24	3.57	4.59	4.74	4.02
Yb	1.68	1.49	1.62	1.62	1.60	1.69	Nb+Y	27.35	23.99	26.35	22.66	22.35	23.87
Lu	0.24	0.21	0.24	0.25	0.25	0.26
注：主量元素含量单位为%，微量和稀土元素为10^-6

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表 5 冈底斯南缘早侏罗世岩浆岩年龄信息统计

Table 5. Age information of Early Jurassic magmatic rocks in southern margin of Gangdese

序号	样品编号	样品岩性	测试方法	年龄结果	采样位置	数据来源
1	S16T76	闪长岩	LA-ICP-MS锆石U-Pb	186.4±1.3Ma	松多乡北	本文
2	X-20	辉长岩	LA-ICP-MS锆石U-Pb	185.9±0.3Ma	墨脱南背崩	[2]
3	TB-1-6	英云闪长岩	LA-ICP-MS锆石U-Pb	179.7±1.7Ma	东嘎乡	[13]
4	TB-1-4	闪长岩（包体）	LA-ICP-MS锆石U-Pb	177.4±1.7Ma	东嘎乡	[13]
5	13GB-10	安山岩	LA-ICP-MS锆石U-Pb	188.8±1.8Ma	得明顶	[50]
6	X03	流纹岩	LA-ICP-MS锆石U-Pb	174.4±1.7Ma	甲马沟叶巴组	[18]
7	Dy1425-2	黑云二长花岗岩	锆石U-Pb	187±10Ma	嘉黎县布久岩体	[19]
8	B553-1	花岗闪长岩	⁴⁰Ar/³⁰Ar	198.2±0.3Ma	金达地区	[20]
9	DZ05-1	英安岩	SHRIMP锆石U-Pb	174.2±3.6Ma	达孜	[10]
10	T384	变形花岗岩	LA-ICP-MS锆石U-Pb	178±1Ma	尼木大桥	[9]
11	b9041	白云母二长花岗岩	SHRIMP锆石U-Pb	190±8Ma	宁中	[16]
12	b7	白云母二长花岗岩	SHRIMP锆石U-Pb	193±7Ma	宁中	[16]
13	b50-2	白云母二长花岗岩	SHRIMP锆石U-Pb	191±10Ma	宁中	[16]
14	ST134A	花岗岩	SHRIMP锆石U-Pb	188.1±1.4Ma	南木林东	[7]
15	DZ-7	英安岩	锆石U-Pb	181±5Ma	达孜	[46]

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参考文献(51)

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