Subsidence history and forming mechanism of anomalous tectonic subsidence in the Bozhong depression, Bohaiwan basin
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- 作者：XiNong Xie (1)
Tao Cui (1)
Müller R. Dietmar (2)
ZaiSheng Gong (3)
XiuRong Guo (1)
XiaoFeng Liu (1)
Cheng Zhang (1) - 关键词：tectonic subsidence ; strike ; slip ; dynamic topography ; Bozhong depression ; Bohaiwan basin
- 刊名：Science China Earth Sciences
- 出版年：2007
- 出版时间：September 2007
- 年：2007
- 卷：50
- 期：9
- 页码：1310-1318
- 全文大小：13726KB
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Tao Cui (1)
Müller R. Dietmar (2)
ZaiSheng Gong (3)
XiuRong Guo (1)
XiaoFeng Liu (1)
Cheng Zhang (1)
1. Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China
2. School of Geosciences, University of Sydney, Sydney, NSW, 2006, Australia
3. China National Offshore Oil Corporation, Beijing, 100027, China - ISSN：1869-1897
文摘
The Bozhong depression of the Bohaiwan basin belongs to a family of extensional basins in East China, but is quite different from other parts of the basin. The Cenozoic subsidence of the depression is controlled by a combination of lithospheric thinning and polycyclic strike-slip movements. Three episodic rifts have been identified, i.e. Paleocence-early Eocene, middle-late Eocene and Oligocene age. The depression underwent syn-rift and post-rift stages, but two episodic dextral movement events of the strike-slip faults modify the subsidence of the Bozhong depression since the Oligocene. The early dextral movement of the Tan-Lu fault associated with crustal extension resulted in accelerated subsidence during the time of deposition of the Dongying Formation with a maximum thickness of 4000 m. A late reactivation of dextral movement of the Tan-Lu fault began in late Miocene (about 12 Ma), which resulted in the intense subsidence of Minghuazhen Formation and Quaternary. In addition, dynamic mantle convection-driven topography also accelerated the post-rift anomalous subsidence since the Miocene (24.6 Ma). Our results indicate that the primary control on rapid subsidence both during the rift and post-rift stages in the Bozhong depression originates from a combination of multiple episodic crustal extension and polycyclic dextral movements of strike-slip faults, and dynamic topography.