煤系不同类型高岭岩中高岭石结晶度的区别

Crystallinity difference for various origin of kaolinites in coal measures

根据X射线衍射曲线特征及亨克利结晶度指数 (Hi) ,将华北石炭 -二叠纪煤系高岭岩中高岭石结晶度划分为 4级 :高度有序 (Hi≥ 1 3) ;有序 ( 1 3 >Hi≥ 1 1) ;较无序 ( 1 1>Hi≥0 8) ;无序 (Hi<0 8) .与风化煤共生的软质高岭土中高岭石结晶度最高 ,为高度有序类型 ;煤层夹矸隐晶高岭岩和火山灰蚀变晶粒高岭岩中高岭石的有序度中等 ,为有序至较无序类型 ;由陆源搬运沉积作用形成的鲕粒和球粒高岭岩、隐晶高岭岩、碎屑和团块状高岭岩、砂质高岭岩中高岭石的结晶度较低 ,为较无序至无序类型 .

The kaolinite crystallinity in kaolinite rocks of Permo-Carboniferous coal measures of North China are classified as four grades: well order( H i≥1 3), order( H i≥1 3), slight disorder(1 1> H i≥0 8) and disorder( H i<0 8), based on the Hinckley index( H i) and the features of XRD of kaolinites. The H i of kaolinite varies with the different origins of kaolinite rocks in China coal measures. It is the highest for the soft kaolin clay associated with weathered coals, which is well order; The second is for cryptocrystalline kaolinite rocks in the coal partings and bottom or roof, which is order type. That for the crystal kaolinite rocks formed by alteration of volcanic ash is medium, slight disorder to order; It is lower for the rocks derived from terrigenious kaolinite, such as oolite and pelletoid, cryptocrystalline, intraclastic, graupen and sandy kaolinite rocks. They are generally slinght disorder to disorder, among which the sandy kaolinite rocks are the lowest. The difference in the Hinckley index of kaolinites is related to the transportation, sedimentation, formation, diagenesis,crystal size and curved form of kaolinite.