热变煤的光学结构及其地质意义

THE OPTICAL TEXTURES OF THE THERMALLY ALTERED COALS AND THEIR GEOLOGICAL IMPLICATIONS

摘要: 不同岩性的岩体侵入不同初始煤级的煤,形成不同宽度的接触变质带,带中煤的光学结构发生大小不同的变化,这种变化具有一定的地质意义。本文强调了热变煤的特征标志是孔隙的存在,并着重探讨了热变煤中新生有机组分——热解碳与小球体光性与成因,指出热解碳具有指热意义,表示近处岩体存在,而小球体及其生成的各向异性体并非表明一定有岩体存在。

Abstract: The zones different in width,in which the optical textures of the coals were more or less changed,were formed when the magma various in properties intruded the coals different incipient rank.This paper emphasised that the vacuoles were the characteristic of the thermally altered coals and explained the optical properties and geneses of the pyrolytic carbon and mesophase.In addition,the existence of the pyrolytic carbon is thought to be the magma existing nearby.