准噶尔盆地南缘独山子—安集海地区构造变换特征

THE CHARACTERISTICS OF DUSHAZI-ANJIHAI TRANSFER ZONE IN A COMPRESSIONAL ENVIRONMENT

挤压地区的构造变换可定义为挤压构造变形中区域上保持缩短量守恒或者有规律的变化而产生的调节构造,应该对褶皱-逆冲断层带作为一个整体来考虑构造活动的变化。它又可以分为纵向和横向传递带两类,褶皱冲断带中分段构造的产生是通过走滑断层形式的横向传递带来完成的。独山子—安集海地区主要是通过铲状等逆冲断层主控的断展褶皱、冲起构造、构造楔入体形成南翼缓北翼陡的背斜。造成该区变形分区的主要原因主要有沉积层厚度的变化、造山带作用程度和作用方式、滑脱层的展布层位。

Tectonic transfer in a compressional environment can be defined as an accommodation structure resulting from conservation or regular conversion of regional shortening strain during compressional deformation.When the change of tectonic activities are concerned the folding-thrusting fault belt should be considered a entirely tectonic activity(stress) to play role on regional strata and basement.It can be divided into two types:vertical and lateral transfer zones.Segmentation of fold-thrust is realized by lateral transfer zone with the pattern of strike-slip fault.Dushazi-Hala′ande-Anjihai asymmetric anticline is formed by fault propagation fold,pop-up anticline,tectonic wedge controled by listric trust.the main reason for this deformation zone are considered as thickness of variational sedimentary stratum,grade and action of orogenic belt and locality of detachment surface.