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运用X射线衍射和X射线荧光分析技术,对黑龙江七台河地区侏罗系上统城子河组的87、90、95和98号煤层顶底板及夹矸中的绿泥石进行了研究.结果表明,研究区粘土矿物以伊蒙间层矿物、伊利石和绿泥石为主,绿泥石含量在2%～17%.随着埋藏深度增加,成岩作用增强,绿泥石含量逐渐降低,且由富Mg绿泥石转变为富Fe绿泥石.研究区绿泥石的形成温度(107～215℃)和成岩作用阶段具有一定的对应关系,其含量的垂向异常分布与下伏岩浆活动有关.岩浆活动导致围岩温度升高,煤层因烘烤作用产生大量的有机酸和CO2,致使成岩流体偏酸性,不利于绿泥石的形成,最终导致其含量随深度逐渐降低.
X-ray diffraction and X-ray fluorescence analysis were used to study the chlorite in the top floor and the seams of No. 87, No. 90, No. 95 and No. 98 coal seam in the Jurassic Chengchenghe Formation in Qitaihe area, Heilongjiang Province.Results The results show that the clay minerals in the study area are mainly composed of Yimeng intergranular minerals, illite and chlorite with chlorite content ranging from 2% to 17%. As burial depth increases, diagenesis increases and chlorite content decreases From Mg-rich chlorite to Fe-rich chlorite.The formation temperature of chlorite in the study area (107-215 ℃) has a certain relationship with the diagenetic stage, and the vertical anomaly distribution of chlorite in the study area and the underlying magmatic activity The magmatic activity led to the increase of the surrounding rock temperature and the formation of a large amount of organic acids and CO2 due to the baking of the coal seam, resulting in the acidity of the diagenetic fluid and not conducive to the formation of chlorite, eventually leading to its decreasing content with depth.