Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Slovakia)

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Marco E. Ciriotti
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Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Slovakia)

Messaggio da Marco E. Ciriotti » lun 07 ago, 2017 20:38

Referenza:
▪ Kiefer, S., Majzlan, J., Chovan, M., Števko, M. (2017): Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Western Carpathians, Slovakia). Ore Geology Reviews, 89, 894–908.

Abstract:
The hydrothermal veins in the area around the town of Dobšiná (Slovakia) are part of a complex Variscan segment, and they host unique high grade Ni-Co-Fe-As ores. 23 samples have been studied in an attempt to describe and understand the complex phase relationships, chemical variability, and formation of the ore. Reflected light microscopy revealed the presence of gersdorffite, arsenopyrite, rammelsbergite, skutterudite, löllingite, native bismuth, as well as minor chalcopyrite and tetrahedrite. The micro-analytical investigation showed the existence of abundant intermediate sulfarsenide-sulfarsenide as well as sulfarsenide-diarsenide phases. We have established the compositional ranges of these minerals, and have shown that formation of complex Ni-Co-Fe-sulfarsenides and arsenides are plausible at temperatures less than 200 °C; further, that the uncritical use of experimental data in the Ni-Co-Fe-As-S system could lead to incorrect assumptions.
Marco E. Ciriotti

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