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近二十年来,在豫西煤田地质勘探过程中,据不完全统计约在15个以上的勘探区内发现有缓倾角断层,构造影响总面积达500平方公里以上。这类构造在我国已有近二十个省份也相继发现,构造影响面积最大者可达千平方公里以上。国外,则早已有发现和研究,说明这类构造的普遍性。这类构造基本特征是:断层面倾角平缓,构造影响范围广,上下盘间缺失地层厚度大,在地层剖面上具有一定的层位性等。按其形成作用力的性质分析,可分为重力滑动构造、挤压推覆构造和挤压—重力滑动构造等三种成因类型。
In the past two decades, in the process of geological exploration in the western Henan coalfield, there is a gentle dip fault discovered in about 15 exploration areas with incomplete statistics. The total area affected by the tectonics is more than 500 square kilometers. This kind of structure has been found in nearly 20 provinces in our country, and the structure-affected area can reach more than one thousand square kilometers. Abroad, then there have long been found and studied to illustrate the universality of such structures. The basic features of this kind of structure are as follows: the dip of fault plane is gentle, the structure has a wide range of influence, the thickness of the missing layer between the upper and lower plates is large, and there is a certain level of stratigraphy in the stratigraphic section. According to the analysis of the forming forces, it can be divided into three types of genesis: gravity sliding structure, extrusion nappe structure and extrusion-gravity sliding structure.