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- W124387029 abstract "The concentrations of 70 elements were determined on 75 bench-channel and 21 complete bed-channel samples from two deep mines in the study area. Ultimate, proximate, sulfur forms, maceral, and pyrite morphological analyses were also conducted on these samples. Scanning electron microscope and electron microprobe analyses were conducted on selected channel and column samples to determine element-mineral and maceral associations. The elements in the Upper Freeport coal bed of the area can be genetically related to three variables (i.e., ash content, pyritic sulfur content, and calcium content). The buffering effect of dissolved calcium carbonate species may have been sufficient to maintain a pH of 4 or greater. Under these pH conditions, sulfate-reducing bacteria generated sulfide species, which reacted to form minerals such as pyrite, sphalerite, chalopyrite, and galena. During coalification, the calcium salts of humic acids decomposed to form calcite and carbon compounds that may account for the calcite in coal macerals and cleats. The pH conditions that existed during peat formation were conducive to the retention of mineral matter, the bulk of which was of plant origin." @default.
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- W124387029 date "1979-01-01" @default.
- W124387029 modified "2023-09-23" @default.
- W124387029 title "Geologic controls on element concentrations in the Upper Freeport coal bed" @default.
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