西藏聂荣微陆块奥陶纪和侏罗纪岩浆事件的年龄证据

陆露; 钱程; 赵珍; 吴珍汉; 刘玉双; 周亮; 王岩

doi:10.3799/dqkx.2018.712

西藏聂荣微陆块奥陶纪和侏罗纪岩浆事件的年龄证据

doi: 10.3799/dqkx.2018.712

陆露^1,2,,
钱程³,
赵珍⁴,
吴珍汉⁴,
刘玉双^1,2,
周亮⁵,
王岩¹

1.
沈阳师范大学古生物学院, 辽宁沈阳 110034
2.
国土资源部东北亚古生物演化重点实验室, 辽宁沈阳 110034
3.
沈阳地质矿产研究所, 辽宁沈阳 110000
4.
中国地质科学院, 北京 100081
5.
山东科技大学地球科学与工程学院, 山东青岛 266590

基金项目:

沈阳师范大学博士、引进人才科研项目启动基金项目 BS201705

中国地质调查局项目 DD20160161

国家自然科学基金面上项目 31672332

详细信息

作者简介:
陆露(1985-), 女, 讲师, 博士, 主要从事青藏高原区域地质调查、大陆动力学研究及相关教学工作

中图分类号: P56
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出版历程
- 收稿日期: 2017-12-20
- 刊出日期: 2018-04-15

Geochronological Evidence of Ordovician and Jurassic Magmatic Events in Nyainrong Microcontinent, Tibet

Lu Lu^{1,2
,},
Qian Cheng³,
Zhao Zhen⁴,
Wu Zhenhan⁴,
Liu Yushuang^1,2,
Zhou Liang⁵,
Wang Yan¹

1.
Paleontological College, Shenyang Normal University, Shenyang 110034, China
2.
Key Laboratory of Evolution of Past Life in Northeast Asia, Ministry of Land and Resources, Shenyang 110034, China
3.
Shenyang Institute of Geology and Mineral Resources, Shenyang 110000, China
4.
Chinese Academy of Geological Sciences, Beijing 100081, China
5.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

摘要

摘要: 为了加深对班公湖-怒江缝合带构造演化过程的认识，选择聂荣微陆块内的花岗质片麻岩和花岗闪长质片麻岩中的锆石进行LA-ICP-MS U-Pb定年，结果主要显示两组²⁰⁶Pb/²³⁸U的加权平均年龄：一组为453.7±2.5 Ma; 另一组为176.6±1.1 Ma和178.04±0.8 Ma.花岗质片麻岩中黑云母和花岗闪长质片麻岩中白云母的⁴⁰Ar-³⁹Ar定年结果显示，坪年龄分别为161.8±1.1 Ma和178.9±1.2 Ma.上述年龄结果表明，聂荣微陆块主要经历了晚奥陶世和早侏罗世两期岩浆事件，这两期岩浆事件分别与冈瓦纳大陆北缘早古生代的造山作用和班公湖-怒江洋壳的俯冲闭合存在密切的动力学关系.
- 青藏高原 /
- 聂荣微陆块 /
- 锆石U-Pb年龄 /
- ⁴⁰Ar-³⁹Ar年龄 /
- 班公湖-怒江缝合带 /
- 地质年代学
Abstract: In order to deepen our knowledge and understanding about the tectonic evolution of the Bangonghu-Nujiang suture zone(BNS), zircon U-Pb dating was conducted for granitic gneiss and granodioritic gneiss of Nyainrong microcontinent by LA-ICP-MS in this study. Results show two groups of average zircon U-Pb ages, with one of 453.7±2.5 Ma, and the other of 176.6±1.1 Ma and 178.04±0.8 Ma. ⁴⁰Ar-³⁹Ar dating was conducted for biotite from granitic gneiss and muscovite from granodioritic gneiss in Nyainrong microcontinent.The ⁴⁰Ar-³⁹Ar plateau ages yield 161.8±1.1 Ma and 178.9±1.2 Ma, respectively, showing that the study area experienced the Late Ordovician and the Early Jurassic magmatic events. Combined with field condition and study results, it is suggested that the Ordovician magmatic event was related to the Early Paleozoic orogeny which could be caused by proto-Tethyan oceanic subduction along Gondwana continental margin, and the Jurassic magmatic event was related to the subduction and closure of the Bangong-Nujiang oceanic crust.
- Tibetan plateau /
- Nyainrong microcontinent /
- zircon U-Pb age /
- ⁴⁰Ar-³⁹Ar age /
- Bangonghu-Nujiang suture zone /
- geochronology

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图 1 青藏高原地质简图

MBT.主边界断裂; YZS.雅鲁藏布江缝合带; BNS.班公湖-怒江缝合带; HJS.可可西里-金沙江缝合带; SKS.昆南缝合带; KJF.喀喇昆仑-嘉黎断裂; JSF.金沙江断裂; XSF.鲜水河断裂; EKF.东昆仑断裂.据吴珍汉等(2009)修改

Fig. 1. Geological sketch map of the Tibetan Plateau

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图 2 聂荣微陆块地质简图

据1:25万安多幅(中国地质大学(北京)地质调查研究院, 2005, 1:25万安多幅地质报告)和1:25万那曲幅(西藏自治区地质调查院, 2005, 1:25万那曲幅地质报告)修编

Fig. 2. The geological map of Nyainrong microcontinent

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图 3 研究区片麻岩样品野外特征及镜下特征

a.样品B06野外特征; b.样品B06镜下特征; c.样品B65野外特征; d.样品B65镜下特征.Q.石英; Pl.斜长石; Bi.黑云母; Ms.白云母

Fig. 3. Field and microscopic characteristics of gneisses in study area

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图 4 样品B06锆石阴极发光图像

Fig. 4. CL images of zircons from sample B06

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图 5 样品B06锆石U-Pb年龄谐和图

Fig. 5. The zircon U-Pb concordia diagrams of sample B06

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图 6 样品B65锆石阴极发光图像

Fig. 6. CL images of zircons from sample B65

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图 7 样品B65锆石U-Pb年龄谐和图

Fig. 7. The zircon U-Pb concordia diagrams of sample B65

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图 8 聂荣微陆块花岗质片麻岩(B06)黑云母(a~c)和花岗闪长质片麻岩(B65)白云母(d~f)⁴⁰Ar/³⁹Ar坪年龄和等时线年龄

Fig. 8. The ⁴⁰Ar/³⁹Ar age plateaus and isochrones for biotite from granitic gneiss (a-c) and muscovite from granodioritic gneiss (d-f) of Nyainrong microcontinent

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表 1 聂荣微陆块片麻岩LA-ICP-MS锆石U-Pb同位素测年结果

Table 1. LA-ICP-MS data of zircons from gneisses in Nyainrong microcontinent

点号	Th/U	同位素比值						年龄(Ma)
点号	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ
花岗质片麻岩(样品B06)
1	0.106 1	0.027 0	0.000 2	0.185 0	0.002 1	0.049 8	0.000 5	171.8	1.2	172.4	1.8
2	2.136 5	0.072 9	0.000 4	0.597 9	0.005 0	0.059 5	0.000 4	453.4	2.6	475.9	3.2
3	5.476 5	0.014 2	0.000 1	0.434 8	0.003 4	0.222 9	0.001 2	90.6	0.6	366.6	2.4
4	1.373 9	0.064 2	0.000 3	0.502 5	0.003 6	0.056 8	0.000 3	400.9	2.0	413.4	2.5
5	0.228 7	0.028 1	0.000 1	0.197 5	0.001 2	0.051 1	0.000 2	178.4	0.8	183.0	1.1
6	1.353 6	0.073 0	0.000 7	0.584 4	0.005 9	0.058 1	0.000 3	454.0	4.2	467.3	3.8
7	0.635 9	0.028 3	0.000 1	0.204 8	0.003 4	0.0525	0.000 9	180.0	0.9	189.2	2.9
8	1.092 7	0.072 6	0.000 4	0.569 2	0.003 6	0.056 9	0.000 2	451.5	2.4	457.5	2.3
9	2.226 1	0.022 4	0.000	0.190 4	0.009 6	0.061 5	0.002 9	143.0	1.6	177.0	8.2
10	0.456 7	0.073 4	0.000 6	0.577 0	0.007 7	0.057 0	0.000 6	456.7	3.5	462.5	5.0
11	1.407 4	0.073 6	0.000 7	0.585 5	0.006 0	0.057 8	0.000 3	457.7	4.2	468.0	3.8
12	0.143 4	0.027 7	0.000 2	0.191 7	0.001 8	0.050 3	0.000 4	176.0	0.9	178.1	1.6
13	6.093 1	0.043 9	0.000 2	0.433 8	0.002 7	0.071 7	0.000 3	276.8	1.2	365.9	1.9
14	0.150 4	0.038 2	0.000 3	0.281 8	0.004 3	0.053 5	0.000 6	241.5	1.8	252.1	3.4
15	0.168 7	0.028 2	0.000 1	0.196 1	0.001 2	0.050 4	0.000 2	179.5	0.8	181.9	1.0
16	0.160 4	0.027 8	0.000 1	0.190 6	0.001 1	0.049 8	0.000 1	176.7	0.9	177.1	0.9
17	0.717 5	0.028 3	0.001 0	0.204 6	0.006 8	0.052 5	0.000 4	179.8	6.6	189.0	5.7
18	0.165 9	0.027 7	0.000 1	0.189 1	0.001 1	0.049 6	0.000 2	175.9	0.7	175.8	0.9
19	0.650 2	0.028 1	0.000 3	0.196 9	0.002 2	0.050 9	0.000 6	178.5	2.1	182.5	1.9
20	1.678 9	0.027 9	0.000 6	0.201 7	0.004 4	0.052 4	0.001 2	177.6	3.7	186.6	3.7
21	0.164 2	0.027 5	0.000 2	0.189 9	0.001 5	0.050 0	0.000 3	175.2	1.0	176.5	1.2
22	1.394 4	0.072 8	0.000 6	0.595 5	0.004 6	0.059 5	0.000 3	453.1	3.6	474.3	2.9
23	5.921 5	0.047 9	0.000 5	0.478 9	0.007 5	0.072 6	0.000 8	301.8	3.3	397.3	5.1
花岗闪长质片麻岩(样品B65)
1	0.290 3	0.066 5	0.000 7	6.080 7	0.057 1	0.663 7	0.002 5	415.0	4.2	1 987.5	8.2
2	1.984 8	0.075 9	0.001 6	6.345 5	0.189 1	0.599 3	0.006 1	471.4	9.8	2 024.8	26.1
3	5.887 7	0.028 2	0.000 5	1.803 3	0.026 0	0.466 4	0.003 4	179.2	3.3	1 046.7	9.4
4	3.381 7	0.028 0	0.000 2	0.198 8	0.002 7	0.051 5	0.000 6	178.2	1.2	184.1	2.3
5	3.136 8	0.029 8	0.000 2	1.361 2	0.012 2	0.331 1	0.002 4	189.4	1.0	872.4	5.3
6	0.433 3	0.028 2	0.000 2	0.202 2	0.002 2	0.052 0	0.000 5	179.5	1.1	187.0	1.9
7	0.701 5	0.081 7	0.000 4	0.656 0	0.004 1	0.058 2	0.000 2	506.2	2.5	512.2	2.5
8	2.606 6	0.059 5	0.000 8	4.638 2	0.062 8	0.565 1	0.001 7	372.7	4.9	1 756.2	11.3
9	0.435 2	0.027 7	0.000 2	0.198 1	0.003 9	0.051 7	0.000 9	176.4	1.1	183.5	3.3
10	2.440 3	0.028 0	0.000 2	1.977 5	0.013 4	0.511 6	0.002 3	178.3	1.2	1 107.9	4.6
11	1.898 1	0.028 1	0.000 1	0.195 6	0.002 2	0.050 5	0.000 5	178.5	0.9	181.4	1.8
12	3.116 1	0.028 2	0.000 3	0.670 7	0.010 1	0.173 3	0.003 0	179.0	1.6	521.2	6.2
13	2.409 7	0.031 6	0.000 5	1.141 4	0.022 6	0.261 4	0.002 3	200.9	3.3	773.2	10.7
14	1.628 7	0.057 7	0.001 8	5.065 0	0.160 7	0.636 9	0.002 4	361.4	11.0	1 830.3	26.9
15	0.508 0	0.027 9	0.000 1	0.201 5	0.001 0	0.052 3	0.000 1	177.6	0.8	186.4	0.8
16	0.038 6	0.027 8	0.000 3	0.190 7	0.002 2	0.049 7	0.000 3	176.9	1.7	177.2	1.9
17	5.200 0	0.032 2	0.000 7	2.626 7	0.038 4	0.595 4	0.005 4	204.2	4.2	1 308.1	10.7
18	2.416 2	0.028 1	0.000 2	0.192 4	0.001 8	0.049 7	0.000 3	178.5	1.2	178.7	1.5
19	1.052 8	0.108 8	0.001 6	5.329 5	0.256 1	0.333 7	0.012 4	665.7	9.5	1 873.6	41.1
20	5.160 5	0.101 0	0.001 5	9.157 6	0.178 8	0.652 4	0.003 7	620.4	9.1	2 353.9	17.9
21	0.428 9	0.025 2	0.001 1	0.933 2	0.055 8	0.480 7	0.214 2	160.7	6.7	669.3	29.3
22	3.723 9	0.040 9	0.009 5	2.533 3	0.110 0	0.594 3	0.014 6	258.2	58.8	1 281.6	31.6

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表 2 聂荣微陆块花岗质片麻岩黑云母和花岗闪长质片麻岩白云母常规⁴⁰Ar/³⁹Ar测年结果

Table 2. Conventionally ⁴⁰Ar/³⁹Ar isotopic age analyses of biotite and muscovite

T(℃)	(⁴⁰Ar/³⁹Ar)_m	(³⁶Ar/³⁹Ar)_m	(³⁷Ar/³⁹Ar)_m	(³⁸Ar/³⁹Ar)_m	⁴⁰Ar(%)	F	³⁹Ar(10^-14 mol)	³⁹Ar(Cum.)(%)	Age(Ma)	±1(Ma)
样品B06(花岗质片麻岩)黑云母W=28.03 mg J=0.004 267
700	56.020 7	0.151 9	8.741 9	0.043 7	20.96	11.8233	0.19	0.49	88.8	2.8
750	26.404 5	0.016 4	0.269 1	0.016 0	81.69	21.574 1	3.33	9.06	158.9	1.5
790	23.095 3	0.002 7	0.154 6	0.013 3	96.55	22.300 6	6.08	24.73	164.0	1.6
830	22.700 9	0.001 3	0.276 4	0.013 0	98.32	22.323 5	6.21	40.73	164.1	1.6
870	22.721 8	0.001 6	0.181 9	0.013 1	97.95	22.259 1	2.84	48.04	163.7	1.6
910	22.990 2	0.003 9	0.858 4	0.013 4	95.21	21.903 0	1.64	52.27	161.2	1.6
950	22.954 2	0.004 7	0.658 3	0.013 4	94.15	21.622 3	1.47	56.05	159.2	1.6
1 000	22.579 1	0.002 9	0.373 0	0.013 6	96.28	21.746 7	3.13	64.13	160.1	1.5
1 050	22.627 6	0.001 5	0.237 2	0.013 1	98.04	22.188 1	5.89	79.31	163.2	1.6
1 080	26.087 2	0.014 8	0.254 4	0.015 2	83.24	21.718 6	3.37	87.99	159.9	1.5
1 120	23.158 5	0.003 1	0.181 3	0.013 2	96.13	22.265 0	3.91	98.07	163.7	1.6
1 400	126.013 0	0.410 7	1.920 1	0.084 4	3.79	4.789 6	0.75	100.00	36.5	1.1
样品B665(花岗闪长质片麻岩)白云母W=27.40 mg J=0.004 301
700	20.958 2	0.015 6	6.004 6	0.015 3	80.03	16.853 6	0.22	0.56	126.2	2.9
750	22.734 0	0.004 2	1.643 3	0.013 2	95.02	21.630 0	0.71	2.39	160.5	1.7
800	23.079 3	0.002 2	1.306 9	0.012 8	97.62	22.554 9	1.43	6.07	167.0	1.6
850	23.584 9	0.001 6	0.723 0	0.012 7	98.24	23.183 9	2.40	12.27	171.5	1.7
890	24.330 9	0.001 6	0.235 4	0.012 8	98.05	23.861 3	4.47	23.79	176.2	1.7
930	24.430 3	0.000 7	0.082 3	0.012 6	99.17	24.229 6	4.82	36.21	178.8	1.7
970	24.757 4	0.001 1	0.345 5	0.012 6	98.81	24.470 2	4.77	48.52	180.5	1.7
1 010	24.624 2	0.001 1	0.156 1	0.012 6	98.69	24.304 2	2.68	55.42	179.4	1.7
1 050	24.713 4	0.001 4	0.376 0	0.012 8	98.43	24.332 2	4.11	66.03	179.6	1.7
1 090	24.616 5	0.001 2	0.253 1	0.012 7	98.60	24.276 7	6.55	82.92	179.2	1.7
1 130	24.592 5	0.000 8	0.234 4	0.012 5	99.11	24.379 0	6.16	98.81	179.9	1.7
1 180	26.853 2	0.010 5	3.263 8	0.012 7	89.30	24.044 0	0.39	99.81	177.5	2.0
1 400	75.442 2	0.210 9	24.901 3	0.050 8	19.74	15.195 3	0.07	100.00	114.2	7.0
注：W.实验参数; J.照射参数.

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