安徽巢北地区古构造应力场恢复

Restoration of palaeotectonic stress field in northern Chaohu of Anhui

以巢北地区发育的节理为研究对象，在前人研究的基础上，依据区内选取的15个观测点节理数据，对巢北古构造应力场进行恢复，发现该地区经历过2次主要构造运动：第一次为印支运动，控制该区所发育的NEE向主要大型褶皱，应力场方向以NNW--SEE向为主，主要方向为287°-355°，平均为319°；第二次为燕山运动，对前期形成的褶皱进行改造，应力场方向以NE—sw向为主，主要方向为23°～68°，平均为44°。

According to the data of 15 joint sets selected from northern region in Chaohu, and taking the development of this geograph- ic area as research object on the basis of previous studies, the authors tried to restore the paleotectonie stress field of northern region in Chaohu, and found that the study area suffered two major geological tectonic movements. The first one was Indosinian movement, which controlled the major fold development in the study area, was dominated by the direction of stress field NNW-SEE, this direction was from 287° to 355° and the average was 319°.The second one was Yanshan movement, whose major direction of stress field was NNW- SEE, this direction was from 23° to 68° and the average was 44°, modified the fold.