昆明市郊筇竹寺地区叠瓦状弧形断裂研究

STUDY OF IMBRICATE CURVIPLANAR FRACTURES IN QIONGZHUSI AREA OF KUNMING SUBURB

本文对筇竹寺附近一组叠瓦状弧形断裂的形成机制进行探讨,认为:该组断裂具多期活动特征;构造岩的特征受原岩性质的影响并具一定的分带性;弧形为燕山运动早期褶皱时断裂面随之弯曲而形成;褶皱和断裂的发生和发展除受控于构造活动时期构造力的方式和方向外,还可能受控于南北向及东西向的古构造。

This paper discusses the formation mechanism of a set of imbricate cur-viplanar fractures adjacent to Qiongzhusi. It is considered that the fractures possess features of multiphasic activities, that the features of tectonites are affected by the natures of primary rocks and the tectonites possess some zo-ning, that the fracture surfaces curve along with folding during the early Yanshanian movement and form the curves, and that the formation and de-velopment of fold and fault are controlled by the mode and direction of tee-tonic stress during period of tectonic movement as well as by palaeosttuctures of SN direction and EW direction.