塔里木盆地西秋里塔格构造带走滑双重构造与“三明治”构造地质建模

Strike-slip Duplex and "Sandwich" Geological Modeling of the Western Qiulitagh Structural Belt,Tarim Basin

据地球物理、地质以及遥感图像解释,西秋里塔格构造带地面发育走滑双重构造,其形成受前古近系基底走滑构造影响。由于基底构造与地面构造之间发育巨厚的古近系蒸发盐,使得这种联系具有间接性。走滑双重构造是在喜马拉雅期南天山—塔里木前陆近南北向挤压和基底左行走滑的复合作用下形成的,具有松弛弯曲背景下的扭张性质。西秋里塔格构造带前古近系基底以花状构造变形为主;盐上盖层为倾滑变形的构造三角带,两者与其间的盐构造共同构成研究区的"三明治"构造地质模型。

Based on the geophysics, geology and remote sensing image analysis, the western Qiulitagh structural belt developed strike-slip duplex on the surface and its form was affected by strike-slip faults in pre-Paleogene basement. The genetic relationship is indirect because a heavy Paleogene evaporates imbedded between the basement and surface structures. The strike-slip duplex formed under the combined stress of the N-S direction approximately compression and the basement sinistral strike-slip activity in the southern Tianshan Mountain-Tarim foreland during the late Himalayan movement, and was provided with transtension at releasing bend. In the western Qiulitagh structural belt, the deformation of the Paleogene basement is characterized by flower structure and the strata overlying evaporate triangle zone exhibited dip-slip, these structures associated with salt structures to form finally the “sandwich” geological model of the study area.