Characteristics and forming mechanisms of transform zone in the Tiantai slope，Xihu Sag，East China Sea Shelf Basin

被引：0
|
作者：
Yu L. [1 ,2 ]
Yu Y. [1 ,2 ]
Jiang Y. [3 ]
Zou W. [3 ]
Chen S. [1 ,2 ]
Tang X. [3 ]
Liang X. [1 ,2 ]
He X. [3 ]
Chen D. [1 ,2 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum（Beijing）, Beijing
[2] College of Geosciences, China University of Petroleum（Beijing）, Beijing
[3] Shanghai Branch, CNOOC, Shanghai
来源：
Oil and Gas Geology | 2023年 / 44卷 / 03期
关键词：
arc fault; East China Sea Shelf Basin; NW-trending fault; tectonic transform zone; Tiantai slope; Xihu Sag;
D O I：
10.11743/ogg20230317
中图分类号：
学科分类号：
摘要：
The Tiantai slope in the Xihu Sag，East China Sea Shelf Basin，has a special tectonic background with a deep NW-trending fault zone cutting through and adjusting/transforming the tectonic features of the Cenozoic in the southern and northern parts of the slope. Based on the detailed interpretation of 3D seismic data and restored balanced cross sections，this study establishes models for the development of deep and shallow faults，determines the tectonic attribute of the NW-trending transform zone and discusses the evolution history and genetic mechanisms of the transform zone against regional geological settings. The results show that the NW-trending extensional detachment faults，including the Tiantaixi fault and the Gushan fault，were developed in the Mesozoic of the Tiantai slope，and have played an accommodating and transforming role in shaping the geological framework and controlling fault development and extension intensity of the Cenozoic，resulting in a gentle and a steep slope respectively on the south and more stretched north parts of the slope. The faults of the Cenozoic in the northern slope obviously outnumber those in the southern slope. Arc fault systems are found to be developed in the hanging wall of the Gushan fault. The NW-trending tectonic transform zone bounded by the Tiantaixi fault and the Gushan fault differs greatly from that formed in the extensional setting，indicating a discrete type of tectonic transform zone. Influenced by the post-orogenic collision and extension between the Qinling and Dabie orogenic belts，and the collision and subduction of the Eurasian and Pacific plates，the transform zone in the Tiantai slope has experienced four evolutionary stages，including the gestation period from the Late Jurassic to the Early Cretaceous，the embryonic period from the middle Early Cretaceous to the Early Eocene，the maturation period from the middle Late Eocene to the Early Oligocene，and the quiescence stage from the Late Oligocene to present. © 2023 Editorial Department of Oil and Gas Geology. All rights reserved.
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页码：753 / 763
页数：10
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