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。
In order to discuss the influence of tectonic evolution process on the present hosting condition of coal series,based on the tectonic dynamics background,the tectonic evolution process and its differentiation genesis of northern and southern segments in Ningdong Coalfield were analyzed by using the tectonic subsidence history and tectonic stress field recovery. It showed that the tectonic evolution process of Ningdong Coalfield was complicated due to the joint control of different tectonic units.The subsidence history of the coalfield was obviously different from west to east. Due to the different position of the thrust nappe structure system,the uplifting denudation in the west is larger than that in the east.The tectonic stress field of coalfield was obviously different from north to south. Due to the different thrust nappe tectonic systems,the direction of maximum compressive stress in the north and south of the stress field is not the same.The tectonic evolution was mainly affected by the control of the northern Qilian fold belt and the Alashan block. The north and south segments belonged to the Liupanshan and Helan Mountain thrust nappe tectonic systems,and the western force was stronger than the eastern part.
出处
《煤炭科学技术》
CAS
北大核心
2017年第6期157-164,共8页
Coal Science and Technology
基金
中国地质调查局地质调查资助项目(12120114012201)
关键词
宁东煤田
构造演化
沉降史
构造应力场
Ningdong Coalfield
tectonic evolution
subsidence history
tectonic stress field
