Two-Stage Activity of the Altyn Tagh Fault during the Cenozoic: Evidence from Seismic Attributes Analysis
详细信息
- 责任者：Xu Bo (Department of Earth Sciences ; Zhejiang University ; Hangzhou 310027 ; China) ; Xiao Ancheng
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(8)
- 关键词：活动构造 ; active tectonics ; 柴达木盆地 ; Qaidam Basin ; 阿尔金断裂带 ; Altun Fracture Zone
- 页码：p.2859-2866
- 图表：7 illus., 1 table, 26 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The structure units of northwestern margin of the Qaidam Basin had experienced complex structural deformation with the Tibetan Plateau continuous extrusion and Altyn Tagh strike-slip since Cenozoic,faults widely developed. It is difficult to clarify the spatial distribution of variety faults in the original three-dimensional (3D) seismic data. Seismic attributes analysis provides a method to get an accurate and unbiased view of fault features,especially in the geological interpretation process of complex region. This paper analyzes the faults of different depth in Xiaoliangshan anticline in the western part of the Qaidam Basin,located in south side of the Altyn Tagh Fault,found early EW-trending thrust faults in the deep,and with the Altyn Tagh Fault strike-slip in the late,forming NW-trending wedge-shaped thrust fault from deep to shallow,the activity of deep NW-trending fault triggered shallow detachment fault. Through comprehensive analysis,we can infer that the Altyn Tagh early uplift led to the formation of the EW-trending oblique thrust fault,and the Altyn Tagh Fault strike-slip movement in the late formed the NW-trending thrust fault in the limbs of Xiaoliangshan anticline since Cenozoic. The activity of faults had two stages.
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