印度-亚洲大陆碰撞过程中新特提斯洋岩石圈的命运

黄丰; 许继峰; 王保弟; 曾云川; 刘希军; 刘函; 余红霞

doi:10.3799/dqkx.2020.180

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 2785-2804

Huang Feng, Xu Jifeng, Wang Baodi, Zeng Yunchuan, Liu Xijun, Liu Han, Yu Hongxia, 2020. Destiny of Neo-Tethyan Lithosphere during India-Asia Collision. Earth Science, 45(8): 2785-2804. doi: 10.3799/dqkx.2020.180

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Huang Feng, Xu Jifeng, Wang Baodi, Zeng Yunchuan, Liu Xijun, Liu Han, Yu Hongxia, 2020. Destiny of Neo-Tethyan Lithosphere during India-Asia Collision. Earth Science, 45(8): 2785-2804. doi: 10.3799/dqkx.2020.180

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Destiny of Neo-Tethyan Lithosphere during India-Asia Collision

doi: 10.3799/dqkx.2020.180

1.
School of Earth Sciences and Resources, China University of Geociences, Beijing 100083, China
2.
Chengdu Center of China Geological Survey, Chengdu 610081, China
3.
Guangxi Key Laboratory of Exploration for Hidden Metallic Ore Deposits, Guilin University of Technology, Guilin 541006, China

Received Date: 2020-05-29
Publish Date: 2020-08-15

Abstract

Abstract

The breakoff of the Neo-Tethyan slab and related magmatism after India-Asia continental collision has been controversial topics in the geological study of the southern Tibetan Plateau. In this study, it reviews the unsolved problems and petrological methods for exploring the process on the Neo-Tethyan slab breakoff. Based on the systematic geochronology, major and trace elements and Sr-Nd-Hf isotope geochemical analyses of the Early Cenozoic mafic rocks in the typical areas of the Lhasa Terrane, it is found that two suites of mafic rocks with ages of ~57 Ma and ~50 Ma have close relationship with the Neo-Tethyan slab breakoff. The ~57 Ma maﬁc rocks are characterized by high Zr/Y and Ti/Y ratios, and their geochemistry indicates an intraplate afﬁnity rather than arc magmas, indicating that they likely correspond to the magmatic expression of the initial stage of Neo-Tethyan slab breakoff. The ~50 Ma maﬁc rocks are appinites, reflecting the water-rich environment in the lithospheric mantle of the southern Lhasa Terrane after the India-Asia collision, suggesting the ﬂux of slab ﬂuids through the lithospheric mantle during breakoff of the Neo-Tethyan slab. Integrating the geochronological and geochemical data of the Early Cenozoic mafic magmatism in the Lhasa Terrane, we have reconstructed the processes from initial tear to completely breakoff of the Neo-Tethyan lithosphere after India-Asia continent collision. The initial tear of the Neo-Tethyan lithosphere occurred at ~57 Ma, then the slab detached from the India lithosphere with a high angle subduction, which resulted in the simultaneous occurrence of extensive mafic magmatism in the central and southern Lhasa Terrane. The complete slab breakoff happened at ~50 Ma. The isotopic compositions of Early Cenozoic magmatic rocks reveal that there was great geochemical heterogeneity of lithospheric mantle beneath the Lhasa Terrane. There were ancient lithospheric materials in the central Lhasa Terrane and eastern part of the southern Lhasa Terrane, while there was mainly depleted juvenile lithosphere in the central part of the southern Lhasa Terrane. The local ancient enriched lithosphere in the Lhasa Terrane is likely to transform into a juvenile depleted lithosphere by the upwelling of the deep mantle material, which may promote the eruption of the felsic magmatism and the growth of continental crust in the Lhasa Terrane.
- India-Asian continental collision,
- Neo-Tethys Ocean,
- slab breakoff,
- mafic rock,
- Lhasa Terrane,
- Tibetan Plateau,
- geochronology,
- geochemistry

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References(113)

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