扬子地台北缘武当推覆体，结构模式及成因分析

地球物理资料和地质研究结果揭示了扬子地台北缘南秦岭造山带武当地区基本构造特征为巨型推覆构造，命名为武当推覆体。该推覆体由北向南可分为汉江推覆岩席、十堰推覆岩席、杨坪推覆岩席、三台推覆岩席及银洞沟推覆岩席。各推覆岩席表现为由印支期前伸展环境下水平滑脱剪切作用所造成的堆垛的武当群岩系在印支期以来南、北两大陆碰撞造山过程中，历经褶皱一韧一脆性推覆和脆性推覆阶段的构造变形，形成由北向南道冲推覆是前展式结构的叠瓦状巨型推覆体。青峰断裂为武当推覆体的前缘断裂带，该断裂向北缓角度延伸构成推覆体的底板主拆离滑脱断层。该区构造变形环境由伸展一挤压并伴随局部伸展一挤压的转化，促成武当推覆体的发生发展和定位。

The Structural Model and Genetic Mechanics of the Wudang Nappe on the North Margin of the Yangtze Platform

The Wudang nappe, revealed by the evidence of geological survey and supported by the geophysical data, which is situated on the north margin of the Yangtze platform,makes up of five thrust sheets composed of stacked proterozoic meta -sedimentary and metavolcanoclastic rocks of the Wudang Group resulted from the horizontally ductile shearing under the pre - indosinian; tretching. The nappe was getting built in the course of the collision between the N. China Platfrom and Yangtze Platfrom since the indosinian,which underwent folding to ductile- brittle thrusting and brittle thrusting deformation stage. Eventually it shows imbricate thrust fan with piggy-back style southwards on the Qingfeng detachment fault dipping to the north gently.