阳泉三矿3#和12#煤层粘土岩夹矸物质组成的再研究

A restudy on the tonstein composition in coal seams 3 # and 12 #,the third coal mine of Yangquan,Shanxi

本文详细论述了阳泉矿区三矿３＃，１２＃煤层粘土岩夹矸的矿物组成、组合及岩性在垂直剖面上的变化。根据其中含有丰富的副象β－石英、钠长石、磁性微球粒，ＴｉＯ２／Ａｌ２Ｏ３比值小于０．０２和特有的粒序层理等特征，表明原始物质来源于降落的酸性钠质火山灰。在蚀变过程中析出的部分Ｎａ＋离子，促使高岭石向钠云母转化，形成了高岭石加钠云母的特殊组合。由于成煤植物和有机质的降解作用可形成ＮＨ＋４离子，也能占位于钠云母的层间。

The tonstein of the coal seams 3 # and 12 # in the third coal mine of Yangquan,Shanxi varies vertically in lithology and mineralogy.The original matter is believed to be sodic acidic ash, as indicated by the abundant paramorph β quartz,albite,magnetic micropellets in the tonstein,TiO 2/Al 2O 3<0 02,the peculiar graded bedding,etc.The generally identical assemblages of the genetic minerals in two tonstein bands suggest that the ash might be cognate rather than synchronous.The Na + ions released from the alteration of the sodic ash made the kaolinite transform into paragonite, forming the special mineral assemblage in both of them. The NH + 4 ions from the degradation of coal forming plants or other organic matters can also occupy the sites of Na + ions at the interlayer of the paragonite, therefore the paragonite contained the NH + 4 ions.