四川盆地喜马拉雅期张扭性断裂构造特征及形成机制

苏楠; 杨威; 苑保国; 戴鑫; 王小丹; 武赛军; 马石玉; 谢武仁; 张光武; 裴仰文

doi:10.3799/dqkx.2020.202

Volume 46 Issue 7

Jul. 2021

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Article Navigation > Earth Science > 2021 > 46(7): 2362-2378

Su Nan, Yang Wei, Yuan Baoguo, Dai Xin, Wang Xiaodan, Wu Saijun, Ma Shiyu, Xie Wuren, Zhang Guangwu, Pei Yangwen, 2021. Structural Features and Deformation Mechanism of Transtensional Faults in Himalayan Period, Sichuan Basin. Earth Science, 46(7): 2362-2378. doi: 10.3799/dqkx.2020.202

Citation:

Su Nan, Yang Wei, Yuan Baoguo, Dai Xin, Wang Xiaodan, Wu Saijun, Ma Shiyu, Xie Wuren, Zhang Guangwu, Pei Yangwen, 2021. Structural Features and Deformation Mechanism of Transtensional Faults in Himalayan Period, Sichuan Basin. Earth Science, 46(7): 2362-2378. doi: 10.3799/dqkx.2020.202

Citation:

Su Nan, Yang Wei, Yuan Baoguo, Dai Xin, Wang Xiaodan, Wu Saijun, Ma Shiyu, Xie Wuren, Zhang Guangwu, Pei Yangwen, 2021. Structural Features and Deformation Mechanism of Transtensional Faults in Himalayan Period, Sichuan Basin. Earth Science, 46(7): 2362-2378. doi: 10.3799/dqkx.2020.202

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Structural Features and Deformation Mechanism of Transtensional Faults in Himalayan Period, Sichuan Basin

doi: 10.3799/dqkx.2020.202

1.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
2.
Research Institute of Exploration and Development, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
3.
School of Geosciences, China University of Petroleum, Qingdao 266580, China

Received Date: 2020-07-10
Publish Date: 2021-07-15

Abstract

Abstract

Previous studies on fault systems mainly focused on thrust belts around the basin and Gaoshiti-Moxi area in central basion. For other areas of the basin, the features, evolution and stress field of fault system is not well understood. In this study, it is newly discovered that a regional transtensional fault system is developed in Zitong-Chengdu-Weiyuan-Huayingshan-Guangan area based on seismic data interpretation. The faults have similar features in the basin, mainly extending from strata of the Sinian system to the Permian system. The faults have vertical occurrence, small normal displacement and negative flower structure. Based on three evidences, it is inferred that the faults are developed in the Himalayan Period: (1) In the Weiyuan-Ziyang area with oblique formations, the fault are still vertical. So the faults are developed after the formation of the Weiyuan anticline which is developed in the Himalayan perioid. (2) Some faults, extending to strata of the Triassic-Jurassic, are of the same system of transtensional faults in the Sinian-Permian strata. Therefore the faults are developed later than the Late Indosinian Period. (3) The distribution of transtensional faults varies from the central part to the compressional areas around the basin, and the stress field of the basin started to vary from the Late Indosinian Period. Based on physical simulation, it is inferred that the faults were developed under torsional stress field. The development of the faults indicates that a NE-SW direction tensional stress field existed in Sichuan basin in the Cenozoic Period. The stress field may originated from the clockwise rotation of the Sichuan basin in the Cenozoic Period.
- Sichuan basin,
- transtensional faults,
- Himalayan Period,
- physical simulation,
- stress field,
- tectonics

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References(62)

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Structural Features and Deformation Mechanism of Transtensional Faults in Himalayan Period, Sichuan Basin

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