徐—宿弧形构造带格局及对其前缘煤（岩）层的影响

FRAMEWORK OF THE XU-SU ARC STRUCTURAL BELT AND ITS INFLUENCE ON THE COAL(ROCK) BED IN ITS FRONT

徐-宿弧形构造带是徐-淮半圆形构造带的中间部分,其前缘分布着张大屯、蒋河等煤田。通过对蒋河煤田地质构造特征研究,结合徐-宿弧形构造带特征,认为前缘煤层被弧形构造带中的逆冲断层切错,造成煤层重复、变陡,部分煤(岩)层倒转。致使冲断带前缘逆掩于煤系地层之上,表明该带有潜伏煤层存在。通过进一步研究和勘查,可为此区煤田找矿提供有力的依据。

The Xu-Su arc structural belt is the middle part of the Xu-Huai semicircle structural belt,whose leading edge is distributed by the Zhangdatun,Jianghe and other coalfields.Based on study of geological and structural characteristics of the Jianghe coalfield and of the characteristics of the Xu-Su arc structural belt,it is suggested that the leading coal seam is cut and displaced by the thrust fault in the arc structural belt,which causes the coal seam to be repeated and steepened,and part of the coal(rock)bed to be inverted.As a result,the front edge of the thrust belt overthrusts the coal-measure strata,indicating the existence of concealed coal seam in the belt.Through further research and exploration,we can provide a powerful basis for coal prospecting in this area.