宁东煤田南北段构造演化差异成因研究

发布时间：2018-03-26 13:37

  本文选题：宁东煤田　切入点：构造演化　出处：《煤炭科学技术》2017年06期

【摘要】：为探讨构造演化过程对煤系现今赋存状况的影响,基于构造动力学背景,采用构造沉降史与构造应力场恢复,对宁东煤田南北段的构造演化过程及分异成因进行了综合分析。结果表明:宁东煤田不同时期受不同构造单元联合控制,构造演化过程复杂;煤田构造沉降史存在东西向分异,由于所处逆冲推覆构造系统位置不同,西部抬升剥蚀量较东部大;煤田构造应力场存在明显南北向分异,由于分属不同逆冲推覆构造系统,各期应力场南北部最大主应力方向不甚相同,其构造演化分异主要受北祁连褶皱带和阿拉善地块的控制影响,南北两段分属六盘山和贺兰山逆冲推覆构造系统,西部受力作用较东部强烈。
[Abstract]:In order to investigate the influence of tectonic evolution on the present occurrence of coal measures, based on the background of tectonic dynamics, tectonic subsidence history and tectonic stress field restoration are adopted. The structural evolution process and differentiation origin of the northern and southern section of Ningdong coalfield are comprehensively analyzed. The results show that the tectonic evolution process of Ningdong coalfield in different periods is controlled by different tectonic units, and the tectonic evolution process is complicated, and the tectonic subsidence history of Ningdong coalfield has east-west differentiation. Because of the different positions of the thrust nappe structure system, the uplift and denudation amount in the west is larger than that in the eastern part, and the tectonic stress field of the coal field is obviously different from the north to the south, because it belongs to different thrust nappe structure system. The direction of the maximum principal stress in the north and south part of the stress field is different, and the tectonic evolution and differentiation are mainly controlled by the North Qilian fold belt and the Alashan block. The north and south sections belong to the Liupanshan and Helan mountain thrust nappe systems respectively, and their tectonic evolution and differentiation are mainly controlled by the northern Qilian fold belt and the Alashan block. The force in the west is stronger than that in the east.
【作者单位】： 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;《中国学术期刊(光盘版)》电子杂志社有限公司;
【基金】：中国地质调查局地质调查资助项目(12120114012201)
【分类号】：P618.11

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