Abstract:

Through electron paramagnetic resonance(EPR) analysis of high-rank coal samples from the Carboniferous coal located in the northern foreland basin of Dabie orogenic belt in the eastern China, the evolution characteristics of aromatic structures of coals of different metamorphism types and the effecting factors are studied. The result indicated that the evolution of the free radical density, the line width and the Lande factor demonstrates the good uniformity, and there is a regular tendency with the increasing of reflectance of vitrinite. The tectonic stress promotes and strengthens the aromatic ring polymerization and the aromatic layer superposition, and causes the tendency of leading evolution of coals.
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Key words: Dabie orogenic belt, high-rank coal, electron paramagnetic resonance, tectonic stress