Spatiotemporal distribution and geodynamic mechanism of the nearly NS-trending rifts in the Tibetan Plateau

BIAN Shuang; YU Zhiquan; GONG Junfeng; YANG Rong; CHENG Xiaogan; LIN Xiubin; CHEN Hanlin

doi:10.12090/j.issn.1006-6616.2021.27.02.018

Volume 27 Issue 2

Apr. 2021

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BIAN Shuang, YU Zhiquan, GONG Junfeng, et al., 2021. Spatiotemporal distribution and geodynamic mechanism of the nearly NS-trending rifts in the Tibetan Plateau. Journal of Geomechanics, 27 (2): 178-194. DOI: 10.12090/j.issn.1006-6616.2021.27.02.018

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Spatiotemporal distribution and geodynamic mechanism of the nearly NS-trending rifts in the Tibetan Plateau

doi: 10.12090/j.issn.1006-6616.2021.27.02.018

BIAN Shuang^{1, 2
,},
YU Zhiquan^{1, 2},
GONG Junfeng^{1, 2
,
,},
YANG Rong^{1, 2},
CHENG Xiaogan^{1, 2},
LIN Xiubin^{1, 2},
CHEN Hanlin^{1, 2}

1.
Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou 310027, Zhejiang, China
2.
Research Center for Structures in Oil and Gas-bearing Basins, Ministry of Education, Hangzhou 310027, Zhejiang, China

Funds:

the National Science Foundation of China 41472182

the Second Tibetan Plateau Scientific Expedition and Research of China 2019QZKK0708

More Information

Received: 2020-12-10
Revised: 2021-02-02
Published: 2021-04-28

Abstract

Abstract

A set of nearly NS-trending rifts developed in the Himalayan orogen and southern Tibet, which are the large-scale extensional structures formed under the continuous compression of the Indo-Eurasia continent, playing a significant role in revealing the post-collisional evolution of the Tibetan Plateau. Different predictions have been made on the spatiotemporal distribution of these rifts through the existing hypothesis models, constituting the key factors constraining the formation system of the rifts. In this study we synthesized previous studies on the initiation time of rifting, and further clarified the spatiotemporal trend. The analysis results showed that the rifting initiated progressively earlier westward, which is consistent with the evolution of post-collisional magmatism in the Lhasa Terrain. Moreover, combined with the geophysical observations, it is inferred that the geodynamic mechanism of the nearly NS-trending rifts accords closely with the hypothesis model concerning the eastward-propagating lateral detachment of the subducted Indian slab. The Indian slab detachment resulted in asynchronous gravitational potential energy gradients, which drove the lithosphere flow eastward and eventually caused the eastward development of the rifting.
- Tibetan Plateau,
- nearly NS-trending rifts,
- E-W extension,
- spatiotemporal distribution characteristics,
- geodynamic mechanism

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Spatiotemporal distribution and geodynamic mechanism of the nearly NS-trending rifts in the Tibetan Plateau

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Spatiotemporal distribution and geodynamic mechanism of the nearly NS-trending rifts in the Tibetan Plateau

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