拉鸡山裂谷带特征及演化

拉鸡山构造带东西长逾 6 50km ,展布于由元古宇组成的结晶地块内部 ,是一条早古生代火山岩极为发育的构造带。通过作者在拉鸡山多年的野外调查工作和研究 ,认为该地区无论在区域地质学、岩石学、构造变形学还是大地构造演化方面 ,其早古生代构造演化史皆具典型的裂谷带特征。晚古生代以来 ,区内经历了陆内多阶段造山过程。新生代早更新世 ,拉鸡山巨型断裂带发生左旋走滑运动 ,导致断裂带弧形转折部位强烈崛起 ,形成雄伟高山。

FEATURES AND EVOLUTION HISTORY OF LAJISHAN RIFT ZONE

Lajishan tectonic zone, 650km long from west to east and occurred within crystallized landmass consisting of Proterozoic strata, is an active tectonic zone with Early Paleozoic volcanic rocks abundantly developed in it. Based on years of field investigation in the area, it is considered that the Early Paleozoic evolution history of the area bears typical rift characteristics, which is reflected by research results on regardless of regional geology, petrology, structural deformation and geotectonic evolution. Since Late Paleozoic Era, intracontinental multi-stage orogeny had taken place. To Early Pleistocene of Cenozoic Era, the huge Lajishan fault belt left-slipped and led to intensive rising at its arc-like hinge location and finally the Lajishan Mountain was formed.