秦岭造山带新生代构造隆升与区域环境效应研究

STUDIES OF THE TECTONIC UPLIFT AT THE CENOZOIC ERA AND THE REGIONALLY ENVIRONMENTAL EFFECTS IN THE QINLING OROGENIC BELT

据沉积，构造、地貌并结合地球物理资料综合研究认为，秦岭造山带新生代构造隆升是在中生代白垩纪晚期构造隆升基础上，于晚第三纪中新世迅速隆升，而早更新世早期则是新构造活动最强烈时期。秦岭造山带的新生代构造隆升的方式主要有地垒式、掀斜式、振荡式和翘板式4种。诱发这一地区新构造抬升的主要原因和动力学机制是华北地块自北而南，扬子地块自南而北相向向秦岭造山带之下陆内俯冲和秦岭地块深部软流圈抬升共同作用所致。

Comprehensive studies on sedimentation, tectonics, geomorphology and data from geophysics have indicated that the Cenozoic tectonic uplift of the Qinling orogenic belt appearedswiftly at the Late Tertiary Miocene epoch, based on the tectonic uplift which happened atthe Late Cretaceous period of the Mesozoic era. And the Earlier period of the Early Pleistocene epoch was the most intense period of the neotectonism movement. The movement ofCenozoic tectonic uplift of the Qinling orogenic belt can be recognized in four types of ways,including horst, tilting, oscillation and basculating. The major cause and dynamic mechanism, inducing this neotectonic uplift, resulted from joint actions of intracontinental underthrust of the North China Land Mass from north to south and the Yangtze Land Mass fromsouth to north, and uplift of the deep-seated rheosphere of the Qinling Land Mass.