Abstract:

Based on analyses of field geology and exploration mine data, the paper has revealed the structural characteristics and the combination pattern of them. Combined with the regional tectonic, it also analysed Wanglou minefield’s tectonic evolution after the formation of coal strata. The results show that groups of normal faults are the main structure of the minefield, and with the distribution of “the deep is more complex than shallow; and the south is more complex than the north”. Beside, it also tells out nearly NS normal faults control the tectonic framework of the minefield and folds mainly developed in the south-central, showing the distribution that NE and NWW open anticlines and tight synclines distribute regularly. Wanglou minefield experienced extrusion-stretching deformation in Indosinian、Yanshanian and Himalayan period. Tectonism of Indosinian is weak. In middle Yanshanian period, intense SE-NW extrusion stress caused lots of NE-NNE compressional thrust faults and nearly NS pressure shear faults. NE and NWW stretch stress of late Yanshanian and Himalayan period not only caused series of NW-NWW normal faults, but also transformed early structures, and the property of faults happened to change. At last formed the extensively development of normal faults pattern.

Key words: Wanglou minefield, structural characteristics, tectonic evolution, coal seam