西江凹陷早新生代断裂演化及其对南海北缘应力场顺时针旋转的响应

程燕君; 吴智平; 张杰; 陈明明; 戴伊宁; 楚逸忱

doi:10.3799/dqkx.2019.250

Volume 45 Issue 6

Jun. 2020

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Article Navigation > Earth Science > 2020 > 45(6): 2199-2209

Cheng Yanjun, Wu Zhiping, Zhang Jie, Chen Mingming, Dai Yining, Chu Yichen, 2020. Early Cenozoic Evolution of Fault System in Xijiang Sag and Its Implication to Clockwise Rotation of Extension Stress in Northern Margin of South China Sea. Earth Science, 45(6): 2199-2209. doi: 10.3799/dqkx.2019.250

Citation:

Cheng Yanjun, Wu Zhiping, Zhang Jie, Chen Mingming, Dai Yining, Chu Yichen, 2020. Early Cenozoic Evolution of Fault System in Xijiang Sag and Its Implication to Clockwise Rotation of Extension Stress in Northern Margin of South China Sea. Earth Science, 45(6): 2199-2209. doi: 10.3799/dqkx.2019.250

Citation:

Cheng Yanjun, Wu Zhiping, Zhang Jie, Chen Mingming, Dai Yining, Chu Yichen, 2020. Early Cenozoic Evolution of Fault System in Xijiang Sag and Its Implication to Clockwise Rotation of Extension Stress in Northern Margin of South China Sea. Earth Science, 45(6): 2199-2209. doi: 10.3799/dqkx.2019.250

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Early Cenozoic Evolution of Fault System in Xijiang Sag and Its Implication to Clockwise Rotation of Extension Stress in Northern Margin of South China Sea

doi: 10.3799/dqkx.2019.250

School of Geosciences, China University of Petroleum, Qingdao 266580, China

Received Date: 2019-07-18
Publish Date: 2020-06-15

Abstract

Abstract

The Xijiang sag is located in the Pearl River Mouth basin, the northern margin of the South China Sea. As one of the Cenozoic sags developed along the northern margin of the South China Sea, this sag recorded the clockwise rotation process of extension stress of the northern margin of the South China Sea. Thus, the study on the geological structure and evolution of this sag would provide robust evidence to this phenomenon. Based on the 2-D and 3-D seismic data, in this paper, it analyzes the Early Cenozoic evolution of the fault system in Xijiang sag. As part of the South China block, the basement of the Xijiang sag experienced several stages of complex evolutions, such as the Indo-China-Asian collision during Triassic, the subduction of Izenaqi plate and Pacific plate, which induced the formation of NE- and NW- striking faults in the basement. During Early to Middle Eocene, the pre-existing NE-striking faults reactivated under the control of the NE-SE-directed extension, and this extension was derived from the NNW-direction subduction of the Pacific plate under the Asian plate. During Late Eocene to Early Oligocene, the extension direction clockwise rotated from NW-SE to N-S, which induced the formation of large amount of EW-striking normal faults and the reactivation of the pre-existing NW-striking fault. This rotation resulted from the direction change of the subduction direction of the Pacific plate from NNW to NWW, the India-Asian collision and the southern ward movement of the Proto-South China Sea block. The analogue experiments are used to investigate the mechanism of the fault evolution. The results show that: (1) under the N-S direction extension, a large amount of EW-striking normal faults formed along the pre-existing NE-striking faults; (2) under the N-S direction extension, a group of pre-existing NW-striking strike-slip faults reactivated, and a small group of EW-striking extensional fault formed.
- fault system,
- stress direction rotation,
- Xijiang sag,
- analogue experiment,
- Early Cenozoic,
- petroleum geology

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References(49)

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