七台河地区侏罗系城子河组中段煤层夹矸中的黏土矿物研究

Study on Coal Parting Clay Minerals in Jurassic Chengzihe Formation Middle Member in Qitaihe Area

通过对七台河地区新建煤矿和新立煤矿侏罗纪城子河组煤层夹矸及顶底板岩石矿物和化学组成研究,发现泥岩、粉砂岩中的黏土矿物主要为伊/蒙间层矿物,其次为伊利石、绿泥石;黏土矿物的含量、分布及组合在纵向上随深度增加,成岩作用增强,伊利石含量增高,伊/蒙间层比降低,同一煤层中夹矸与顶底板的岩性差异,导致前者绿泥石含量高于后者;在横向上,受岩浆作用影响较大而煤变质程度较高的地区,其伊利石和绿泥石含量偏高。

Through studies on coal parting, roof and floor mineral and chemical composition in Jurassic Chengzihe Formation in Xinjian and Xinli coalmines, Qitaihe area, have found that the clay minerals in mudstone and siltstone are mainly illite/smectite interstratified minerals followed by illite, chlorite. Vertically, the clay mineral contents, distribution and combination along with increasing of depth, the diagenesis and illite content increased, while the ratio of illite/smectite interstratified minerals decreased, due to lithologic difference between parting and roof, floor in a same coal seam, bring on chlorite content in the parting higher than in the roof and floor. Laterally, in higher magmatism impacted and higher coal metamorphism degree areas, the illite and chlorite contents on the high side.