Structural Characteristics and Origin of Boundary Fault Belts of the Gaoyou Sag in the Subei Basin
详细信息
- 责任者：Wang Xi (School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Chen Qinghua
- 刊名：Geotectonica et Metallogenia
- 出版年：2013
- 卷期：37(1)
- 关键词：边界断层 ; boundary faults ; 高邮凹陷 ; Gaoyou sag
- 页码：p.20-28
- 图表：illus., 4 tables, 28 refs.
- 分类号：0300
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
As the boundary of the Gaoyou Sag, the Zhenwu and Wubao Fault Belts show complicated geometry and evolution history. Based on 3D seismic interpretation and calculation of mean fault active rate, we analyze the geometric and kinematic characteristics of the two fault belts during Late Cretaceous-Quaternary and establish the temporal-spatial relationship of development of the main faults as a whole. The authors also investigate the development patterns and the formation processes of the two fault belts respectively. The results show that the main boundary faults of the Gaoyou Sag were formed during the deposition of the Funing and Dainan Formations and might have been related to the NW-trending subduction of the paleo-Pacific Plate, which caused the NW-SE trending regional extension in East China. In particular, the trends and the formation patterns of the Zhen②、Wu② and Ji3 Faults are related to the boundary conditions. The authors also infer that the Zhenwu and Wubao Fault Belts are formed through different mechanism. The Zhenwu Fault Belt was formed by stretching while the Wubao Fault Belt was formed via an oblique slip mechanism which maybe related to the dextral strike-slip of the Tanlu Fault. The dextral strike-slip of the Tanlu Fault maybe connected with the regional EW-trending compression induced by orthogonal subduction of the paleo-Pacific Plate.
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