兰州地区现代应力场的构造解析

Tectonic Analysis of Contemporary Stress Field in Lanzhou Region

摘要:

在对兰州地区兴隆山北缘断裂、白杨树沟断裂和西湾-雷庄断裂等的活动性研究的基础上,根据断裂擦痕斜角资料,结合区域其他构造应力场资料,应用构造应力解析方法计算了兰州的构造应力场。研究结果表明:①兰州地区区域构造应力场主压应力方向总体在NE到近EW向的范围内;②现今构造应力场继承了更新世以来的构造应力场;③深部和表层构造应力场基本一致;④区域构造运动是以水平构造应力为主导的。

Abstract:

Based on the field work data of fault plane scratch on Northern Margion Fault of Xinglongshan, Baiyangshugou fault and Xiwan-Leizhuang fault, the tectonic stress field is obtained. With other data related to the contemporary tectonic stress field, the characteristics of tectonic stress field in Lanzhou region are summarized： （1）The direction of the principal stress along the fault zone mainly varies with NNE-NEE. （2）The contemporary tectonic stress field inherites the one in Late Pleistocene. （3）The stress field on surface is concordant with that in depth. （4）The contemporary regional stress field mainly is in a horizontal compression way.