青藏高原松多中三叠世洋壳的识别及其对松多古特提斯洋演化的制约

段梦龙; 解超明; 范建军; 王斌; 郝宇杰

doi:10.3799/dqkx.2019.100

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2249-2264

Duan Menglong, Xie Chaoming, Fan Jianjun, Wang Bin, Hao Yujie, 2019. Identification of the Middle Triassic Oceanic Crust of the Sumdo in the Tibet Plateau and Its Constraints on the Evolution of the Sumdo Paleo-Tethys Ocean. Earth Science, 44(7): 2249-2264. doi: 10.3799/dqkx.2019.100

Citation:

Duan Menglong, Xie Chaoming, Fan Jianjun, Wang Bin, Hao Yujie, 2019. Identification of the Middle Triassic Oceanic Crust of the Sumdo in the Tibet Plateau and Its Constraints on the Evolution of the Sumdo Paleo-Tethys Ocean. Earth Science, 44(7): 2249-2264. doi: 10.3799/dqkx.2019.100

Citation:

Duan Menglong, Xie Chaoming, Fan Jianjun, Wang Bin, Hao Yujie, 2019. Identification of the Middle Triassic Oceanic Crust of the Sumdo in the Tibet Plateau and Its Constraints on the Evolution of the Sumdo Paleo-Tethys Ocean. Earth Science, 44(7): 2249-2264. doi: 10.3799/dqkx.2019.100

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Identification of the Middle Triassic Oceanic Crust of the Sumdo in the Tibet Plateau and Its Constraints on the Evolution of the Sumdo Paleo-Tethys Ocean

doi: 10.3799/dqkx.2019.100

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China

Received Date: 2018-11-29
Publish Date: 2019-07-15

Abstract

Abstract

The Sumdo green schist is distributed in the Sumdo area in the segment of the Lhasa block. Because of the low level of research on its age and tectonic characteristics, it has seriously constrained our understanding of the evolution of the Sumdo Paleo-Tethys Ocean. Based on the detailed field geological survey, petrology, whole-rock geochemistry, LA-ICP-MS zircon U-Pb isotope and zircon Hf isotope analysis were carried out on the green schist. The zircon U-Pb age is approximately 232 Ma in the Sumdo green schist, which is the Middle Triassic, representing the protolith's crystallization of the green schist. The ε_Hf(t) of zircons is 3.6 on average, showing the characteristics of a weakly depleted mantle. Petrology and geochemistry studies reveal that the protolith of green schist has characteristics of tholeiite, which appears as a flat curve in the chondrite-normalized REE patterns and primitive mantle-normalized trace element spidergrams, similar to N-MORB attributes. In all kinds of discriminative diagrams, they all fall into the N-MORB field, indicating that the protolith of Sumdo green schist may be an oceanic crust fragment from the Sumdo Paleo-Tethys Ocean. The identification of the Middle Triassic green schist in Sumdo indicates the Sumdo Paleo-Tethys Ocean may hold oceanic basin during the Middle Triassic.
- Sumdo Paleo-Tethys Ocean,
- green schist,
- geochemistry,
- zircon U-Pb chronology,
- zircon Hf isotope

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