准噶尔盆地南缘托斯台地区构造特征及形成机制

本文以近年来地震概查、高精度重力详查及地面地质细测资料,对托斯台地区进行了深、浅层次的构造特征及形成机制探讨,其中:深层次古生界变质基底为压扭性堑垒结构组合,划分出一个高垒带,一个低堑带和两个斜坡带;浅层次中、新生界构造属重力作用形成的滑褶构造,呈现出重力滑脱构造组合。托斯台地区经历了多旋回构造发展过程,但构造主要形成于喜马拉雅构造期。

CHARACTERISTICS AND MECHANISM OF FORMATION OF STRUCTURES IN TOUSITAI AREA,SOUTH MARGIN,JUGGAR BASIN

According to general seism ic survey, high-accurity detail gravity survey and detailed materials of surface geology, this paper probed into the characteristics and mechanism of formation of structures in deep and shallow stratigraphies in Tousitai area，in which， in deep stratigraphies Palaeozoic metamorphic bases were the combinations of structures of transpression horsts and grabens from which we supposed a zone of high horsts, a zone of low grabens and two slope zones, in shallow stratigraphies the Mesozoic and Cenozoic structures were slip-fold ones formed by gravity action and showed the combinations of grjvity-deiachment structures. Though Tousitan area stood the development of multicyclic structures , the structures , the-re were mainly formed during Himalayan orogeny.