Chemistry of chlorites from hydrothermal veins in the Variscan flysch sequences of the Nízký Jeseník Upland (Czech Massif)

 

Authors: Zimák J

Published in: Bulletin of Geosciences, volume 74, issue 1; pages: 43 - 46;

Keywords: Hydrothermal veins, chlorite, chemistry, chlorite geothermometry,

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Abstract

Chlorites from hydrothermal veins composed of quartz and/or carbonate (calcite, dolomite-ankerite) that cross-cut unmetamorphosed to epizonally metamorphosed Variscan flysch sequences in the Nízký Jeseník Upland were studied by chemical methods to elucidate the conditions of their formation. All analyzed chlorites belong to the clinochlore-chamosite solid solution. Six various geothermometers were applied that are based on the number of octahedral vacancies, the number of tetrahedral Al and the value Fe/(Fe+Mg). They yielded temperatures of formation of the chlorites that range from 167 to 375 °C.