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The forms of occurrence and geochemistry of sulfides in hard coal deposits of the Libiąż Beds in the Upper Silesian Coal Basin, Southern Poland

Bielowicz B., Misiak J.

Geology, Geophysics and Environment

2017

Vol. 43, no. 2

109--125

Samples of coal from the eastern part of the Upper Silesian Coal Basin, between Jaworzno and Libiąż, were collected from test boreholes and underground excavations in the Janina Coal Mine, southwest Poland. The No. 111-119 hard coal seams are in the upper part of the Cracow Sandstone Series (the Libiąż Beds, Westphalian D). Macroscopically, iron sulfides (pyrite and marcasite) found in hard coal seams are usually in vein and impregnation forms. On the basis of microscopic observations, the following forms of iron sulfides occurrence in the studied coal were observed: framboidal pyrite, euhedral crystals, skeletal and massive vein forms, or pocket-like (impregnation) forms. On the basis of SEM-EDS analysis and X-ray diffraction it can be stated that the iron sulfides observed in coal are a mixture of pyrite and marcasite. WDS analysis in the micro area revealed the chemical composition of sulfides. The iron sulfides contain admixtures of Pb, Hg, Zn, Cu, Au, Ag, Sb, Co, and Ni. There was no As and Cd found in the examined minerals. It has been shown that the tested iron sulfides do not include significant admixtures. There is only a slight enrichment in lead in the vein forms of sulfides. In addition to the iron sulfides, individual inclusions of galena and sphalerite within the pyrite and marcasite have been observed.

Mineralizacja markasytowo-hematytowo-ankerytowa w południowo-wschodniej części Gór Świętokrzyskich

Nieć M., Pawlikowski M.

Przegląd Geologiczny

2015

Vol. 63, nr 4

219–-227

The occurrences of previously unknown, iron sulphide (marcasite-pyrite)-hematite and ankerite mineralization have been recorded in the eastern part of the Holy Cross Mts. They are located in the fault zones within Middle Devonian dolomites. Irregular recrystalization of dolomite and its replacement by illite is an accompanying peculiar feature. Similar disseminated pyrite-hematite mineralization is known in the hanging wall of the Rudki iron sulphide ore deposit. The occurrence and mineral composition of this mineralization allow to suppose it was formed by low temperature hydrothermal processes, close to the end of the Variscan orogeny.