东昆仑造山带海德乌拉辉绿岩成因及其地质意义

孙立强; 王凯兴; 戴佳文; 刘晓东; 刘文恒; 余驰达; 雷勇亮; 陈耀新; 林俊杰

doi:10.3799/dqkx.2022.270

Volume 49 Issue 4

Apr. 2024

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Article Navigation > Earth Science > 2024 > 49(4): 1261-1276

Sun Liqiang, Wang Kaixing, Dai Jiawen, Liu Xiaodong, Liu Wenheng, Yu Chida, Lei Yongliang, Chen Yaoxin, Lin Junjie, 2024. Petrogenesis of Haidewula Diabase, Eastern Kunlun Orogenic Belt and Its Geological Implications. Earth Science, 49(4): 1261-1276. doi: 10.3799/dqkx.2022.270

Citation:

Sun Liqiang, Wang Kaixing, Dai Jiawen, Liu Xiaodong, Liu Wenheng, Yu Chida, Lei Yongliang, Chen Yaoxin, Lin Junjie, 2024. Petrogenesis of Haidewula Diabase, Eastern Kunlun Orogenic Belt and Its Geological Implications. Earth Science, 49(4): 1261-1276. doi: 10.3799/dqkx.2022.270

Citation:

Sun Liqiang, Wang Kaixing, Dai Jiawen, Liu Xiaodong, Liu Wenheng, Yu Chida, Lei Yongliang, Chen Yaoxin, Lin Junjie, 2024. Petrogenesis of Haidewula Diabase, Eastern Kunlun Orogenic Belt and Its Geological Implications. Earth Science, 49(4): 1261-1276. doi: 10.3799/dqkx.2022.270

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Petrogenesis of Haidewula Diabase, Eastern Kunlun Orogenic Belt and Its Geological Implications

doi: 10.3799/dqkx.2022.270

1.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
2.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
3.
Qinghai Nuclear Industry Geological Bureau, Xining 810001, China

Received Date: 2022-04-21
Available Online: 2024-04-30
Publish Date: 2024-04-25

Abstract

Abstract

The timing of the closure of the A'nyemaqen ocean, which was a branch of Paleo-Tethys ocean at the East Kunlun orogenic belt (EKOB), is still a subject of debate. In this study, it presents zircon U-Pb geochronology, whole-rock elemental geochemistry and Sr-Nd isotopic data on the Haidewula diabase in the eastern section of the EKOB. Zircon LA-ICP-MS U-Pb isotope dating reveals that the Haidewula diabase formed at 238±2 Ma. The diabase is characterized by low MgO (2.76%-6.34%) contents, as well as relatively high TiO₂ (1.75%-2.46%) and Fe₂O₃^T (8.88%-12.30%) contents. The diabase shows enrichment in incompatible elements, but is relatively depleted in Nb, Ta, Sr, and Ti. All these geochemical characteristics imply that the diabase is a production of island arc magmatic activity. Additionally, the diabase displays enriched and uniform Sr-Nd isotopic compositions((⁸⁷Sr/⁸⁶Sr)_i= 0.711 61-0.712 95, ε_Nd(t) =-3.2 to -2.8). Based on the geochemical characteristics and isotopic compositions, it suggests that the Haidewula diabase was derived from partial melting of an enriched mantle, which had undergone metasomatism induced by the fluid released from the subducting slab, and had experienced some degree of crustal contamination during migration through continental crust. Combing our results and previous studies on Middle Permian-Triassic basic igneous rocks in the EKOB, it proposes that the northward subduction of the A'nyemaqen ocean lasted to the end of the Middle Triassic (238 Ma); the closure of the A'nyemaqen ocean happened during early Late Triassic; then, the tectonic environment of the eastern section of the EKOB transited into post-collisional extension no later than 228 Ma.
- East Kunlun orogenic belt,
- tectonic evolution,
- Triassic,
- diabase,
- petrogenesis,
- petrology

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References(94)

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