JUMPY EVOLUTION OF EPR RESPONSE OF CHINESE HIGH-RANK COALS AND ITS IMPLICATION TO GEOCHEMISTRY

Based upon a series of the coal-graphite samples collected from China, the jumpy evolution of the EPR response of the high-rank coals was fo und and its geochemical mechanism was further inquired. The results sh owed that the makingup, which is activated notably at about 6.0% maxim um vitrinite reflectance, might play a principal role in the developme nt of the macromolecular basic structural units in the coals being in the middle to late stage of high-rank coalification and that the homol ogisation of the chemical bonds in the macro-molecular structure might provide a geochemical microenvironment for the realization of the mak ingup.