Identifying Tectonic Activity of the Altyn Tagh Fault during Early Cenozoic from 3D Seismic Attributes Analysis
详细信息
- 责任者：Jia Dan (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：断裂带 ; fracture zones ; 三维地震法 ; three-dimensional seismic methods ; 阿尔金断裂带 ; Altun Fracture Zone
- 页码：p.2851-2858
- 图表：6 illus., 1 table, 25 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Altyn Tagh Fault is one of the most prominent and important tectonic units within the Tibet Plateau,and holds great significance in understanding the growth of the plateau. The initiation of the Altyn Tagh Fault has always been a hot topic. Previous studies demonstrated the Altyn Tagh Fault was started at ca. 35. 5Ma in the Cenozoic,the time when the uppermost Xiaganchaigou Fm. (XG) was accumulated in the Qaidam Basin as well. A study of lithofacies and paleogeography of upper XG is performed in Hongliuquan-Qigequan area of Qaidam Basin,adjacent to the Altyn Tagh Fault,based on the analysis of 3D-seismic attribute and drillhole data. Our results illustrate that the paleo-environment during the deposition of upper XG was started with deep lake and then shifted to shallow lake and lake shore facies upwardly. Such geological process may be controlled by syn-sedimentary uplift,which was subsequently evolved into en echelon folds related with sinistral shear of the Altyn Tagh Fault. Considering the sedimentary response in Qaidam Basin,we conclude the Altyn Tagh Fault was started at ca. 40Ma. Our method present in this study could detect the sedimentary response to tectonic uplift with higher sensitivity than traditional geological methods.
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