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- W1990656077 abstract "The mineralogical changes in a bituminous coal seam, thermally altered by a small basaltic intrusion, have been investigated using electronic low-temperature (oxygen plasma) ashing, X-ray diffraction and other laboratory techniques. An assemblage dominated by montmorillonite and well-crystallized kaolinite, in the area away from the intrusion, passes laterally to one dominated by illite and poorly crystallized kaolinite, along with abundant dolomite and calcite, at the actual contact point. Geochemical considerations of both the mineral matter and the igneous rock suggest that the changes in the clay fraction were produced by heating to temperatures of between 400 and 650°C for a relatively short period, coupled with migration of potassium from the intrusive body into the coal seam. Heating at lower temperatures, although causing an increase in vitrinite reflectance, does not appear to have had a particularly significant effect at all on the clay minerals in the coal seam." @default.
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- W1990656077 date "1989-03-01" @default.
- W1990656077 modified "2023-09-26" @default.
- W1990656077 title "Geochemical and mineralogical changes in a coal seam due to contact metamorphism, Sydney Basin, New South Wales, Australia" @default.
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- W1990656077 doi "https://doi.org/10.1016/0166-5162(89)90001-3" @default.
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