甘肃白银地区了高山多期活动断裂带变形特征及运动机制探讨

DEFORMATION CHARACTERISTICS AND MOTION MECHANISM OF MULTI-STAGE ACTIVE FAULT ZONES IN BAIYIN AREAS OF GANSU

了高山断裂带位于中北祁连结合带东段,为自加里东构造中期开始,发生板块俯冲—软碰撞—逆冲推覆造山过程中,多期构造叠加变形而形成的复杂的构造带。在1∶25万区调过程中,笔者通过对该断裂带内各类构造变形的观察和分析,采用构造解析的理论和方法,进行了构造变形序列和变形特征的分析研究,探讨其运动机制,为祁连造山带时空分布及其发展提供重要的地质依据。

Liaogaoshan faulted zone lie in the eastern segment of the centeral-northern Qilian junction zone, It happened subduction-soft collision-thrust-nappe tectonic beginning centeral Caledonian, then became a complex tectonic belt because of different periods deformations. In the 1 ∶ 250 000 regional geological survey,the author studied the tectonic deformation sequence and deformation features of this zone by the structural analysis methods. It provides important geologic evidenced for the time-area and developments of Qilian orogenic belts.