再论煤中大分子基本结构单元演化的拼叠作用

THE STUDY OF FURTHERMORE DISCUSSION ON THE MAKING-UP OF MACRO-MOLECULAR BASIC STRUCIURAL UNITS IN COALS

芳构化作用和环缩合作用的传统煤化作用理论具有一定局限性，煤中基本结构单元拼叠作用是高煤级煤演化的特有机理。拼叠作用显著发生的起点位于镜质组最大反射率Ro，max为6．0％附近，大分子化学键的均裂提供了拼叠作用得以实现的微化学环境条件，其实质是一种“动力化学”过程，与氧接芳碳等有关的大量“均裂”是在短暂的煤化阶段中突然出现的，导致“拼叠作用”的显著发生具有“阶跃式”特征，是造成高煤级煤中期到后期阶段大分子基本结构单元急剧增大的根本原因和主要地球化学机理。

There exist some limitations in the traditional coalification theory such as the arorntization and ring-condensation, and the rnaking-up action of the basic structural units (BSU) incoals mny be a peculiar mechanism for the developmnt of high-rank coalification. The makingup action starts notably abeut Ro.max 6 .0%, and the homlogisation of the chernical bonds inthe macro-molecular structure can provide a gaxhemical microenvironrnent for the reaLlization ofthe action which is essentially a dynamic chemical process. A great deal of homlogisation related to the oxygen-linked arornatic carbon occurs suddenly in a short stage of coalification, and results in the jurnp of the rernarkable Tnaking-up development. It rnay be the main cause and geochemical mechanism for the rapid enlargemnt of the BSU in the middle-late stages of high-rankcoalification.