龙门山中北段印支晚期构造活动: 来自构造解析及碎屑锆石年代学的证据

沈桐; 孟立丰; 陈伟; 余养里; 周小军

doi:10.3799/dqkx.2020.017

Volume 46 Issue 5

May 2021

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Article Navigation > Earth Science > 2021 > 46(5): 1728-1736

Shen Tong, Meng Lifeng, Chen Wei, Yu Yangli, Zhou Xiaojun, 2021. Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology. Earth Science, 46(5): 1728-1736. doi: 10.3799/dqkx.2020.017

Citation:

Shen Tong, Meng Lifeng, Chen Wei, Yu Yangli, Zhou Xiaojun, 2021. Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology. Earth Science, 46(5): 1728-1736. doi: 10.3799/dqkx.2020.017

Citation:

Shen Tong, Meng Lifeng, Chen Wei, Yu Yangli, Zhou Xiaojun, 2021. Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology. Earth Science, 46(5): 1728-1736. doi: 10.3799/dqkx.2020.017

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Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology

doi: 10.3799/dqkx.2020.017

School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Received Date: 2020-08-25
Publish Date: 2021-05-15

Abstract

Abstract

It is wildly shared that the western Sichuan basin changed from passive continental margin to a foreland basin during the Late Triassic. In order to depict this transition process as well as the time and intensity of the tectonic activity of Longmenshan thrust belt during Late Indosinian, a seismic section in the middle part of Longmenshan thrust belt was used to perform structural geometric analysis. The results show that the large scale thrusting of Longmenshan probably occurred during the early stage of the deposition time of T₃x⁴ and the total displacement was at least 11 km. This is also supported by the sedimentary record of the detrital zircon U-Pb age from the synchrous strata. The major age peak of ~800 Ma shows great affinity to the Pengguan complex and Baoxing complex from the middle section of Longmenshan belt. It is concluded that the basement in the middle part of Longmenshan belt was uplifted partly during T₃x³ and provided materials for the western Sichuan basin.
- Longmenshan thrust belt,
- Late Triassic,
- thrust nappe structure,
- equilibrium section restoration,
- detrital zircon,
- U-Pb geochronology,
- sedimentology

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References(46)

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Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology

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