塔河地区古生界下构造亚层构造样式及成因

Structural Styles and Controlling Factors of Lower Paleozoic Structural Sublayer in Tahe Area

利用塔里木盆地前期构造成果及三维地震资料,指出塔河地区断裂平面样式分为弧形走滑断裂、平行走滑断裂、“X”形共轭剪切断裂,以及左行右阶走滑断裂样式;剖面断裂样式主要可以划分为挤压型、过渡类型以及走滑型。研究表明,古生界下构造亚层的构造变形主要是加里东中期至晚期,特别是中奥陶世晚期在北昆仑洋、阿尔金洋闭合的背景下,盆地北部边界大规模剪切挤压作用控制的,并形成以挤压翻转构造、大型走滑断裂为标志的构造样式。

According to the early structural achievements and three-dimensional seismic data of the basin,the plane styles of faults in Tahe Area are divided into arc strike slip faults,parallel strike slip faults,X-type conjugate strike slip faults,and left-hand and right-hand strike slip faults.The section faults can be divided into compression type,strike slip type and Transitional type.The above study shows that the structural deformation of the lower Paleozoic structural sublayer is mainly in the middle late Caledonian,especially in the late Middle Ordovician,under the closed background of the North Kunlun ocean and the Altun ocean,when the northern boundary of the basin is controlled by large-scale shear compression,and a structural style marked by the compressional overturned structure and large-scale strike slip fault is formed.