Abstract
The effects of thermal alteration by an igneous intrusion on the organic matter and inorganic constituents of a coal seam in the Shuoli mine, Anhui Province, China, have been investigated using reflected light microscopy, X-ray diffraction analysis (XRD), X-ray fluorescence spectrometry (XRF), inductively coupled plasma–mass spectrometry (ICP-MS), an electron microprobe, and a scanning electron microscopy system equipped with an energy-dispersive X-ray spectrometer (SEM-EDS). A total of 11 coal benches were collected from the profile (numbered as SI5-1 to SI5-11), all of which were found to be metamorphosed from a distance of 80 cm below the sill to the sill/coal contact; benches Sl5-8 to Sl5-11, which are in direct contact with the sill, were completely converted to natural coke. The maximum paleo-temperature inferred from Ro,max of the natural coke is estimated to be 1000 °C. The minerals formed by the molten magma invasion are dominated by veins of mixed-layer illite/smectite (I/S). However, mixed-laye...
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