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本文对西缘断褶带(北段)的区块对比及其东界位置提出了新的观点。认为在若干千米长的推覆带上,因背景环境、边界条件造成的位移不同步,可以形成纵向剪切、高角度掩冲、挤压对峙和低角度推覆等多种类型。指出所谓马家滩地区断面西倾实指各种冲断席的断层系,与表征前缘推挤带特征的断面东倾断层系统不属同类,不能对比。马家滩地区前缘推挤带断层断面同样是东倾的,和该带的横山堡地区,铁克苏庙地区一致。从而提出了推覆体前缘带形式变化说,认为各区块是同一地应力场下的不同表现形式,无须做分段的扭压拉张等解释。同时不同意以断层或向斜轴划分该区东界,提出了构造过渡的观点,并建议重新考虑铁克苏庙坳陷的大地构造单元属性。
In this paper, a new viewpoint is put forward on the regional comparison of the western margin of fold belt (the northern segment) and its eastern boundary position. It is considered that for several km long thrust belt, the displacement due to the background and boundary conditions can not be synchronized, and various types of longitudinal shearing, high angle masking, extrusion confrontation and low angle nappe can be formed. It is pointed out that the so-called Majiatan section west fault actually refers to the various thrust faults, which is not the same as that of the eastward fault fault system that characterizes the front thrust belt. Majiabang front thrust belt fault section is also eastward tilt, and the belt of Yokoyama area, Tiekesu Temple area consistent. Therefore, the change of the form of the front belt of the nappe body is put forward. It is considered that each block is a different manifestation under the same ground stress field, so it is not necessary to make the interpretation such as the twisting and tensioning of the section. At the same time, it disagrees with dividing the east boundary of the area by fault or syncline, and puts forward the viewpoint of tectonic transition, and proposes reconsidering the geotectonic properties of the Tekesu Temple depression.