Analysis of tectonic characteristics and regional tectonic evolution of Southern Gaoshan exploration area in Yiluo coalfield
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摘要: 宜洛煤田高山南部勘查区属华北地台渑临台坳区,断层构造较发育。为了厘清高山南部勘查区的构造特征及其对煤层的影响,通过对区内二维地震、钻探资料以及野外地质资料的综合分析,探讨了勘查区构造特征及构造演化规律,认为区内构造变形主要包括印支期、燕山期和喜马拉雅期3个阶段,断层构造主要有印支期近EW向断层、燕山晚期NW向推覆构造及喜马拉雅期NE向张性断层,对勘查区内煤层均有较大破坏,在勘查区东部二1煤层中存在“二层楼”现象。研究可为宜洛煤田下一步寻找煤炭资源提供新的思路和找矿靶区。Abstract: Southern Gaoshan exploration area of Yiluo coalfield belongs to Mianlin depression area in North China Platform, with relatively developed fault structures. In order to clarify the structural characteristics of the exploration area in Southern Gaoshan and the influence on coal seam, the authors discussed the structural characteristics and tectonic evolution regularity of the exploration area, based on the comprehensive analysis of 2D seismic data, drilling data and field geological data. It is considered that the tectonic deformation in the area mainly includes three stages: Indosinian, Yanshanian and Himalayan. The fault structures mainly include the nearly EW trending faults in Indosinian Period, NW-trending nappe faults in Late Yanshanian and NE-trending tensile faults in Himalayan, which have greatly damaged the coal seams in the exploration area. The phenomenon of “two-storey building” exists in the 2-1 coal in the east of the exploration area. This research could provide new ideas and prospecting target areas for the further findings of coal resources in Yiluo coal field.
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Key words:
- Yiluo coalfield /
- tectonic characteristics /
- thrust nappe structure /
- tectonic evolution
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