晋北罕见的“烧变高岭岩”研究

晋北大同及浑源一带,在上石炭世太原统四号煤系中,常见有洁白色的粘土岩,外貌酷似“人工熟料”,其成因与煤层的自燃作用有关。由于原岩主要矿物为高岭石故命名这种洁白色的粘土岩为“烧变高岭岩”。

A Study on the Rare "Burned Kaolinite Clay Rock",in Northern Shanxi

A kind of white clay rock similar to grog matericals is found in Early Carboniferous coal seams in northern Shanxi. here it is called "Burned kaoli- nite clay rock",because it is formed by the metamorphism spontaneous com- bastion of the coal. Studies with microscope and electron microscope, chemical analysis, diffe- rential thermal analysis as well as X-ray diffraction analysis etc., reveal that the clay rock consists of metakaolinite with mullite or kaolinite, locally with epigenetic allophane.