西藏松多地区蛇纹岩成因及其对松多古特提斯洋俯冲的约束

王斌; 解超明; 董永胜; 段梦龙; 宋宇航; 郝宇杰

doi:10.3799/dqkx.2022.474

Volume 49 Issue 3

Mar. 2024

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Wang Bin, Xie Chaoming, Dong Yongsheng, Duan Menglong, Song Yuhang, Hao Yujie, 2024. Origin of Serpentinite in Sumdo Area, Xizang and Its Constraint on Subduction of the Sumdo Paleo-Tethys Ocean. Earth Science, 49(3): 837-849. doi: 10.3799/dqkx.2022.474

Citation:

Wang Bin, Xie Chaoming, Dong Yongsheng, Duan Menglong, Song Yuhang, Hao Yujie, 2024. Origin of Serpentinite in Sumdo Area, Xizang and Its Constraint on Subduction of the Sumdo Paleo-Tethys Ocean. Earth Science, 49(3): 837-849. doi: 10.3799/dqkx.2022.474

Citation:

Wang Bin, Xie Chaoming, Dong Yongsheng, Duan Menglong, Song Yuhang, Hao Yujie, 2024. Origin of Serpentinite in Sumdo Area, Xizang and Its Constraint on Subduction of the Sumdo Paleo-Tethys Ocean. Earth Science, 49(3): 837-849. doi: 10.3799/dqkx.2022.474

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Origin of Serpentinite in Sumdo Area, Xizang and Its Constraint on Subduction of the Sumdo Paleo-Tethys Ocean

doi: 10.3799/dqkx.2022.474

Wang Bin^{1, 2
,
,},
Xie Chaoming^{1, 2, 3
,
,
,},
Dong Yongsheng¹,
Duan Menglong^{1, 2},
Song Yuhang^{1, 2},
Hao Yujie³

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Research Center for Tibetan Plateau, Jilin University, Changchun 130061, China
3.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China

Received Date: 2022-08-25
Available Online: 2024-04-12
Publish Date: 2024-03-25

Abstract

Abstract

Zircons in serpentinite can not only provide chronological information, but also constrain the genesis of serpentinite and regional tectonic evolution process. Longyasongduo serpentinite in Tangjia-Sumdo Paleo-Tethys suture zone was studied by means of zircon U-Pb dating, whole-rock geochemistry, and zircon Hf isotope in this paper. The results show that Longyasongduo serpentinites have high MgO, TFeO and Mg^# values but low Al₂O₃ and TiO₂ contents. The chondrite-normalized REE patterns display a gentle U-type. The primitive mantle-normalized spider diagrams exhibit enrichment in U, Ta and depletion in Th, Nb, Zr and Hf. Zircon U-Pb dating of Longyasongduo serpentinite yielded ages of (230.3±2.3) Ma, with ε_Hf(t) values of +13.4 to +16.0. Through chronological and geochemical studies, we argue that the protolith of Longyasongduo serpentinite is the residual of partially melted spinel lherzolite in the mantle wedge. Longyasongduo serpentinite was metasomatized by supercritical fluid generated by subduction of Sumdo Paleo-Tethys oceanic crust to form metasomatic zircon, which may also be metasomatized by aqueous solutions, resulting in enrichment of fluid-mobile elements. Based on previous studies, we infer that the Sumdo Paleo-Tethys Ocean was still in a northward subduction setting in the Late Triassic.
- QinghaiXizang Plateau,
- Sumdo Paleo-Tethys Ocean,
- serpentinite,
- metasomatic zircon,
- petrology,
- geochemistry

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References(64)

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Origin of Serpentinite in Sumdo Area, Xizang and Its Constraint on Subduction of the Sumdo Paleo-Tethys Ocean

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