羌塘盆地构造应力场初步分析

详细信息

收稿日期: 2005-03-25

ANALYSIS OF THE STRUCTURAL STRESS FIELD OF THE QIANGTANG BASIN

Received Date: 25 March 2005

摘要: 地处青藏高原腹地的羌塘盆地构造以EW向褶皱和逆(冲)断层及NW向、NE向平移断层为主,偶见NW向、NE向褶皱和近SN向正断层。据构造组合分析、构造解析研究、数理计算及有限单元法模拟,盆地构造变形应力场最大主应力方位以近SN向为主,伴有NW-SE向、NE-SW向和近EW向。表明自印支运动以来长期处于SN向强烈挤压,伴随间歇性(或派生)NE-SW、NW-SE和近EW向挤压。
- 青藏高原 /
- 羌塘盆地 /
- 构造应力场
Abstract: EW-trending folds and reversed(thrust) faults and NW-and NE-trending strike-slip faults predominate in the Qiangtang basin in the interior of the Qinghai-Tibetan Plateau,and occasionally NW-and NE-trending folds and nearly N-S-trending normal faults my be found.Based on the structural combination analysis,structural analysis,mathematical calculation and finite element modeling,it is revealed that the orientation of the maximal principal stress of the structurally deformed stress field in the basin is nearly north-south,with attendent NW-SE,NE-SE and nearly E-W orientations,which indicates that the basin has long undergone N-S strong compression since the Indosinian movement,accompanied by intermittent(or derivative) NE-SW,NE-SE and nearly E-W compression.
- Qinghai-Tibetan Plateau /
- Qiangtang basin /
- tectonic stress field