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Mineralogy and origin of supergene mineralization at the Farbište ore occurrence near Poniky, central Slovakia

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Author(s): Števko M | Sejkora J | Bačík P

Journal: Journal of Geosciences
ISSN 1802-6222

Volume: 56;
Issue: 3;
Start page: 273;
Date: 2011;
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Keywords: supergene mineralization | copper minerals | arsenates | Farbište near Poniky | Slovakia

ABSTRACT
Supergene mineralization at the hydrothermal Farbište ore occurrence near Poniky, central Slovakia, was studied using optical and electron scanning microscopy, X-ray powder diffraction, electron microprobe and IR spectroscopy. Two principal associations of the supergene minerals were observed. The first is represented mostly by tyrolite with a higher content of sulphate groups and chrysocolla associated with copper carbonates. The second is characterized by a rich assemblage of copper arsenates: low-S tyrolite, strashimirite, parnauite, olivenite, cornwallite, cornubite, euchroite and clinoclase, which occur together with chrysocolla, bariopharmacosiderite-Q, brochantite, azurite and malachite. Both associations formed as a result of decomposition of primary ore minerals, especially tennantite, which is the prevalent primary ore mineral at the Farbište occurrence and was the main source of Cu, As and S ions in the supergene zone.

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