Comparative mineralogical study of thermally-altered coal-dump waste, natural rocks and the products of laboratory heating experiments
2015 (English)In: International Journal of Coal Geology, ISSN 0166-5162, E-ISSN 1872-7840, Vol. 139, no SI, 114-141 p.Article in journal (Refereed) Published
Research on rocks formed due to pyrometamorphism of waste in burning coal-mine dumps (BCMD) mainly in the Upper Silesian Coal Basin has enabled identification of a large number of different mineral species. These species are usually well-known minerals, e.g., olivines, plagioclases and clinopyroxenes. However, their crystal chemistry is often unique. Mineralogical- and chemical similarities between the BCMD and non-anthropogenic geological environments are outlined here. To better understand the crystallization processes of the minerals occurring in the BCMD, three types of heating experiments were performed. For these, ten protolith (thermally-unchanged) dump samples, mostly shales and carbonate rocks, were heated alone and mixed together and with a CaF2 flux. Quantitative chemical analyses of the synthesized mixtures have shown that they are mineralogically similar to the rocks found in the BCMD. They are also similar in terms of their crystal chemistry, e.g., synthesized clinopyroxenes are rich in diopside and esseneite components and may capture phosphorus, plagioclase is rich in anorthite and contains iron and magnesium, and wüstite exists as a solid solution with periclase and is doped with calcium and other elements. Highly variable amounts of indialite–ferroindialite were formed in some samples due to solid-phase transformations or melt crystallization, depending on the experimental conditions and the protolith used.
Place, publisher, year, edition, pages
2015. Vol. 139, no SI, 114-141 p.
Coal fire; Burning coal-mine dumps; Wüstite; Magnesioferrite; Clinopyroxene; Thermal chamber
Geosciences, Multidisciplinary Geology
Research subject Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
IdentifiersURN: urn:nbn:se:uu:diva-241010DOI: 10.1016/j.coal.2014.08.013ISI: 000354340800011OAI: oai:DiVA.org:uu-241010DiVA: diva2:777441