Reflectance on the origin of deformed coal in Ⅱ₁coal bed in the coal field of west Henan province

Abstract：In order to study the origin of deformed coal, the primary structure coal and deformed coal from deference tectonic areas in the coal fields of west Henan province is taken as the research object.The methods of oriented samples and reflectance measure are used for contrast research.It is found that the reflectance of deformed coal is commonly higher than the primary structure coal.According to the relation between reflectance and tectonic stress, the palaeotectonic stress field of each tectonic area can be obtained.The result indicates that the origin of the coal deformed in Ⅱ1 coal bed is gravity sliding structure induced by the early Xishan raise-slanting movement based on earlier faults in Songji tectonic area, and however, it is a kind of the reverse thrust nappe structure generated during the later Yanshan movement in Xiaoxiong tectonic area.

Keyword：coal fields of west Henan;origin of deformed coal;reflectance;