秦岭大地构造分区的遥感影像判读

根据遥感影像的纹理结构及其相对应的地球物理场特征，秦岭地区可自然分割出四个构造景观单元。即：东秦岭盆岭构造区、西秦岭隆凹构造区、南秦岭叠覆构造区和镇淅盆隆构造区。构造影像单元的拼接组合关系，一定程度上反映了华北板块、扬子板块、松潘—甘孜地块、秦岭—大别地块构造域的地质演化史。即：晋宁—加里东构造旋回期，扬子板块与外来地块（秦岭—大别地块、松潘—甘孜地块）实现对接形成南中国联合大陆板块；自海西构造运动开始，华北板块向南推进，从东向西先后与南中国板块的前锋俯冲碰撞，随后进入陆内造山阶段。燕山运动末期，秦岭地区造山活动结束，伸展拉张作用由北向南展开。

INTERPRETATION OF REMOTE SENSING IMAGES OF TECTONIC DIVISION IN QINLING REGION

According to texture structure of remote sensing images and its corresponding feature of geophysical field, Qinling region is divided into four tectonic landscape units,the Dong qinling basin and range terrain,the Xiqinling upwarping downwarping region, the Nanqinling overlaping tectonic region and Zhenan Xichuan basin and upwarding tectonic region.The exist of tectonic image units illustrated the history of geological evolution of the North China plate, Yangtz plate, Songpan Ganzi landmass and Qinling Dabie landmass tectonic field. The Yangtz plate with foreign landmass(Qinling Dabie landmass, Songpan Ganzi landmass)formed the South China united continent in the period of Jinning Caledonian cycle.As Hercynian movement, the North China plate which moved towards south was subducted and collised with the South China plate from east to west successively, then the intracontinental orogenic stage started. In the terminal time of Yanshan movement, with orogeny finishing, extensional tectonic system developed from north to south.