大同煤田塔山矿构造发育特征及形成机制研究

Study on the Tectonic Development Characteristics and Formation Mechanism of Tashan Mine in Datong Coalfield

构造特征控制着煤层展布规律和煤储层物性的非均质性,查明矿区构造发育特征是煤矿安全开采的基础。为厘清大同煤田塔山矿构造发育特征及形成机制,基于地质详查报告和野外实地勘探工作,划分了不同延伸方向的构造体系;依据区域地质志及前人研究成果,厘定了不同体系构造的形成其次和形成的应力机制。结果表明:塔山矿断裂构造较为发育,且大多为开启性正断层,逆断层罕见;发育①NE-SW和NNE、②NW-SD和③NEE和E-W 3个体系构造;分别形成于燕山早—中期、燕山晚期—喜马拉雅早期和海西—印之期,喜马拉雅晚期—现代构造运动加强和改造了研究区的构造特征。研究结果可为塔山矿的安全开采提供一定的理论指导。

In order to clarify the tectonic development characteristics and formation mechanism of Tashan mine in Datong coalfield,this study divided the tectonic systems of different extension directions based on detailed geological survey report and field exploration works.And determined the formation period and the stress mechanism of different system tectonics according to the region geological records and predecessors research results.The results show that,the faults in Tashan mine are developed,most of which are open normal faults,while the reverse faults are rare;There are three tectonic systems developed:①NE-SW and NNE,②NW-SD,③NEE and E-W,they were formed in the Early-Middle Yanshanian,late Yanshanian-early Himalayan and Hercynian-Indian periods respectively.Late Himalayan-modern tectonic movement strengthened and reformed the tectonic characteristics of the study area.