豫西煤田二_1煤层中构造煤成因的反射率研究

Reflectance on the origin of deformed coal in Ⅱ_1 coal bed in the coal field of west Henan province

为探索构造煤的成因,以豫西煤田不同构造区的构造煤和原生结构煤为研究对象,采用定向标本及反射率测定的方法作对比研究,发现构造煤的反射率比原生结构煤的发射率普遍增高.根据反射率与构造应力的关系,求得各构造区的古构造应力场,揭示了在前期断裂基础上喜山早期掀斜运动诱发的重力滑动构造是嵩箕区二1煤层中构造煤形成的主要原因,在崤熊区为燕山晚期的逆冲推覆作用.

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.