西藏班公湖-怒江缝合带中段去申拉组火山岩锆石U-Pb年龄及Hf同位素特征

张开江; 刘治博; 李海峰; 高轲; 王超; 王嘉星

西藏班公湖-怒江缝合带中段去申拉组火山岩锆石U-Pb年龄及Hf同位素特征

1.
成都理工大学地球科学学院, 四川成都 610059

2.
中国地质科学院矿产资源研究所, 北京 100037

3.
中国地质大学地球科学与资源学院, 北京 100083

4.
中国地质调查局成都地质调查中心, 四川成都 610081

基金项目:
中国地质调查局项目《藏西北铜多金属资源基地综合调查评价》（编号：DD20190167）和中国地质科学院基本科研业务费（编号：YK1604）

详细信息

作者简介: 张开江(1995-), 男, 在读硕士生, 矿物学、岩石学、矿床学专业。E-mail:1055290762@qq.com

通讯作者: 刘治博(1981-), 男, 博士, 助理研究员, 主要从事构造地质学研究工作。E-mail:geoleo@163.com

中图分类号: P588.14;P597⁺.3

收稿日期: 2019-01-04

修回日期: 2019-04-18

刊出日期: 2019-06-15

Zircon U-Pb age and Hf isotopic characteristics of Qushenla Formation volcanic rocks in the middle part of the Bangong Co-Nujiang suture, Tibet

1.
College of Earth Science, Chengdu University of Technology, Chengdu 610059, Sichuan, China

2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

4.
Chengdu Center of Geological Survey, China Geological Survey, Chengdu 610081, Sichuan, China

More Information

Corresponding author: LIU Zhibo, geoleo@163.com

Received Date: 04 January 2019

Revised Date: 18 April 2019

Publish Date: 15 June 2019

摘要

摘要:
西藏班公湖-怒江缝合带广泛分布中生代岩浆活动，对于认识特提斯洋的演化有重要的启示。班公湖-怒江缝合带中段东卡错微陆块去申拉组安山岩的锆石U-Pb测年和Hf同位素测试结果显示，其中21个测点给出的锆石²⁰⁶Pb/²³⁸U年龄加权平均值为110.3±0.7Ma；ε_Hf（t）值为-5.66~1.05，二阶段Hf模式年龄为1020~1448Ma，表现出壳幔混源的特征。综合区域构造沉积演化及前人研究成果，认为东卡错微陆块内发育的去申拉组火山岩很可能与早白垩世班公湖-怒江洋壳南向俯冲消减引起的板片断离有关，并形成于板内伸展环境，其岩浆来源于聂荣微陆块成熟地壳物质发生深熔或重熔作用形成的酸性熔体与古老岩石圈地幔部分熔融产生的基性熔体的混合。
- LA-ICP-MS锆石U-Pb定年 /
- Hf同位素 /
- 岩浆混合 /
- 东卡错微陆块 /
- 班公湖-怒江缝合带
Abstract:
Mesozoic magmatic activities are widely distributed in the Bangong Co-Nujiang suture zone in Tibet, and it is important to study them for understanding the evolution of the Tethys Ocean. This paper reports the zircon U-Pb dating and zircon Hf isotope data of the andesites of the Qushenla Formation in the Dongkaco microcontinental block of the middle Bangong Co-Nujiang suture zone. The zircon ²⁰⁶Pb/²³⁸U weighted age of the andesites obtained from 21 sites is 110.3±0.7Ma. Zircon Hf isotope analysis shows that the zircon ε_Hf(t) varies in the range of -5.66~1.05, and second stage Hf model ages are 1020~1448Ma, showing the characteristics of crust-mantle mixing. Considering regional tectonic sedimentary evolution and previous research results, the authors hold that the volcanic rocks of the Qushenla Formation were probably related to the slab break-offduring southward subduction of the Bangong Co-Nujiang oceanic crust in the Early Cretaceous, and were produced in an intraplate extensional environment. The magma was derived from the mixing of acidic melt formed by deep melting or remelting of mature crustal material in Nyainrong microcontinent with basic melt formed by partial melting of ancient lithospheric mantle.
- LA-ICP-MS zircon U-Pb dating /
- Hf isotope /
- magma mixing /
- Dongkaco microcontinent /
- Bangong Co-Nujiang suture

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图 1 研究区大地构造位置(a)及地质简图(b)

Figure 1.

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图 2 去申拉组安山岩野外照片（a、b）与显微照片（c、d）

Figure 2.

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图 3 去申拉组安山岩锆石阴极发光（CL）图像、测点²⁰⁶Pb/²³⁸U年龄值和ε_Hf(t)值(实线圈代表测点²⁰⁶Pb/²³⁸U年龄值，虚线圈代表ε_Hf(t)值)

Figure 3.

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图 4 去申拉组安山岩锆石U-Pb谐和图（a）和²⁰⁶Pb/²³⁸U年龄图（b）

Figure 4.

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图 5 去申拉组安山岩锆石ε_Hf(t)-U-Pb年龄图解(a)和锆石Hf同位素直方图(b)

Figure 5.

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图 6 东卡错微陆块构造演化简图

Figure 6.

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图 7 去申拉组玄武岩Zr-Zr/Y和Ta/Hf-Th/Hf图解(盐湖地区去申拉玄武岩数据据Sui等^[35]，物玛地区数据据康志强等^[37]；查格隆地区数据据麦源君等^[36]，改则地区数据据李伟等^[38]，达查沟地区数据据吴亮等^[34])

Figure 7.

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表 1 去申拉组安山岩样品（17D021）LA-ICP-MS锆石U-Th-Pb同位素组成

Table 1. LA-ICP-MS zircons U-Th-Pb isotope composition from andesites(17D021) in the Qushenla Formation

测点编号	Pb	Th	U	Th/U	同位素比值						年龄/Ma
测点编号	/10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	1.78	85.2	230	0.37	0.0488	0.0017	0.1187	0.0041	0.0168	0.0002	142	81	113.9	3.8	107.9	1.7
2	3.10	124	386	0.32	0.0497	0.0016	0.1195	0.0040	0.0171	0.0002	184	77	114.7	3.6	109.8	1.7
4	1.85	112	241	0.47	0.0480	0.0020	0.1153	0.0049	0.017	0.0002	104	99	110.8	4.5	108.7	1.9
5	3.45	153	445	0.34	0.0474	0.0011	0.1155	0.0027	0.0174	0.0002	72	55	111.0	2.5	111.5	1.5
6	3.17	180	408	0.44	0.0477	0.0013	0.1158	0.0032	0.0173	0.0002	87	65	111.3	3.0	110.8	1.5
7	2.79	168	356	0.47	0.0480	0.0012	0.1148	0.0029	0.0174	0.0002	99	60	110.3	2.7	111.5	1.5
8	2.65	127	318	0.40	0.0512	0.0014	0.1244	0.0035	0.0174	0.0002	252	64	119.1	3.2	111.4	1.6
9	3.39	166	417	0.40	0.0496	0.0012	0.1184	0.0029	0.0175	0.0002	178	55	113.7	2.6	111.9	1.5
10	5.26	199	656	0.30	0.0486	0.0010	0.1187	0.0026	0.0176	0.0002	129	50	113.9	2.4	112.7	1.4
11	1.31	62.3	164	0.38	0.0495	0.0020	0.1188	0.0048	0.0173	0.0003	176	93	114.0	4.4	110.9	1.9
12	2.82	142	344	0.41	0.0518	0.0016	0.1207	0.0038	0.0169	0.0002	279	70	115.8	3.5	108.2	1.6
13	1.78	78.7	218	0.36	0.0505	0.0018	0.1218	0.0045	0.0173	0.0002	219	84	116.8	4.1	110.6	1.8
14	0.95	33.6	109	0.31	0.0542	0.0025	0.1252	0.0057	0.0170	0.0003	383	102	119.8	5.2	109.2	2.1
15	2.87	152	366	0.41	0.0484	0.0012	0.1156	0.0029	0.0173	0.0002	122	59	111.1	2.7	110.7	1.5
16	2.42	101	304	0.33	0.0492	0.0014	0.1208	0.0034	0.0173	0.0002	157	65	115.8	3.2	111.1	1.6
17	1.97	106	256	0.41	0.0481	0.0014	0.1152	0.0035	0.0171	0.0002	108	71	110.7	3.2	109.4	1.6
19	2.60	128	333	0.39	0.0501	0.0016	0.1186	0.0040	0.0167	0.0002	203	77	113.8	3.7	107.0	1.6
20	2.95	167	377	0.44	0.0483	0.0012	0.1161	0.0030	0.0173	0.0002	114	59	111.6	2.7	111.2	1.5
21	3.45	178	437	0.41	0.0490	0.0012	0.1171	0.0029	0.0172	0.0002	149	57	112.5	2.7	110.5	1.5
22	3.02	209	400	0.52	0.0467	0.0014	0.1131	0.0035	0.0173	0.0002	34	73	108.9	3.3	110.9	1.6
24	1.66	63.5	203	0.31	0.0531	0.0036	0.1181	0.0080	0.0165	0.0004	333	147	113.4	7.3	105.6	2.6

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表 2 去申拉组安山岩样品（17D021）锆石Hf同位素组成

Table 2. Hf isotopic composition of zircons from andesites (17D021) in the Qushenla Formation

测点编号	¹⁷⁶Hf/¹⁷⁷Hf_Corr	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Yb/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	t_DM1/Ma	t_DM2/Ma	f(_Lu/Hf)
1	0.282648	0.000021	0.001459	0.000019	0.036403	0.000556	-4.37	-4.37	865	1366	-0.96
2	0.282719	0.000019	0.000676	0.000014	0.015172	0.000324	-1.89	-1.89	749	1208	-0.98
4	0.282671	0.000018	0.001128	0.000013	0.025349	0.000304	-3.56	-3.56	825	1314	-0.97
5	0.282730	0.000018	0.001134	0.000012	0.026297	0.000291	-1.47	-1.47	742	1181	-0.97
6	0.282612	0.000019	0.001052	0.000011	0.028600	0.000264	-5.66	-5.66	907	1448	-0.97
7	0.282675	0.000017	0.001050	0.000009	0.024113	0.000240	-3.43	-3.43	818	1306	-0.97
8	0.282678	0.000020	0.001322	0.000008	0.031477	0.000223	-3.33	-3.33	820	1299	-0.96
10	0.282719	0.000018	0.001098	0.000006	0.024985	0.000146	-1.86	-1.86	757	1206	-0.97
11	0.282802	0.000018	0.000701	0.000012	0.015777	0.000312	1.05	1.05	633	1020	-0.98
12	0.282700	0.000017	0.001348	0.000034	0.032514	0.000958	-2.56	-2.56	790	1250	-0.96
13	0.282741	0.000018	0.001106	0.000009	0.025384	0.000208	-1.10	-1.10	726	1157	-0.97
14	0.282643	0.000021	0.000891	0.000032	0.022070	0.000808	-4.58	-4.58	860	1379	-0.97
15	0.282669	0.000020	0.001449	0.000027	0.035175	0.000638	-3.66	-3.66	836	1320	-0.96
16	0.282740	0.000018	0.000846	0.000019	0.019199	0.000453	-1.13	-1.13	722	1159	-0.97
17	0.282729	0.000018	0.001000	0.000003	0.022321	0.000095	-1.54	-1.54	742	1185	-0.97
19	0.282737	0.000016	0.001078	0.000003	0.025248	0.000119	-1.23	-1.23	731	1166	-0.97
20	0.282672	0.000019	0.001237	0.000004	0.029806	0.000138	-3.53	-3.53	826	1312	-0.96
21	0.282675	0.000024	0.001004	0.000014	0.023222	0.000334	-3.43	-3.43	817	1306	-0.97
注：同位素校正公式：ε_Hf(t)=10⁴×{[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt-1)]/[(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR(0)-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR(t)×(e^λt-1)]1},t_DM=1/λ×ln{1+ [(¹⁷⁶Hf/¹⁷⁷Hf)_S- (¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[(¹⁷⁶Lu/¹⁷⁷Hf)_S- (¹⁷⁶Lu/¹⁷⁷Hf)_DM]},t_DM^C=t_DM- (t_DM- t) × [(f_CC- f_S)/(f_CC- f_DM)], f_Lu/Hf =(¹⁷⁶Lu/¹⁷⁷Hf)_S/ (¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1, 其中λ=1.867×10^-11a^-1^[23]; (¹⁷⁶Lu/¹⁷⁷Hf)_S和(¹⁷⁶Hf/¹⁷⁷Hf)_S为样品测量值; (¹⁷⁶Lu/¹⁷⁷Hf)_CHUR(t)=0.0332, (¹⁷⁶Hf/¹⁷⁷Hf)_CHUR(0) =0.282772^[24]; (¹⁷⁶Lu/¹⁷⁷Hf)_DM=0.0384, (¹⁷⁶Hf/¹⁷⁷Hf)_DM=0.28325, (¹⁷⁶Hf/¹⁷⁷Hf) 平均地壳 =0.015^[25]; f_CC=(¹⁷⁶Hf/¹⁷⁷Hf) 平均地壳/ (¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1; f_S=f_Lu/Hf ;f_DM=(¹⁷⁶Lu/¹⁷⁷Hf)_DM/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1; t为锆石结晶年龄

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