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COPPER-BEARING PYRITE FROM THE OKA MARIN POLYMETALLIC DEPOSIT, SERBIA: MINERAL INCLUSIONS OR TRUE SOLID-SOLUTION?

Aleksandar Paevski¹, Eugen Libowitzky², Peria ivkovi³, Radovan Dimitrijevi⁴ and Ljubomir Cvetkovi⁴

¹ Faculty of Mining and Geology, University of Belgrade, uina 7, 11000 Belgrade, Serbia
² Institut für Mineralogie und Kristallographie, Geozentrum, Althanstr. 14, A–1090 Wien, Austria
³ Nikola Tesla 11, 19250 Majdanpek, Serbia
⁴ Faculty of Mining and Geology, University of Belgrade, uina 7, 11000 Belgrade, Serbia

E-mail address: pacevski{at}mkpg.rgf.bg.ac.yu

We have established the presence of structurally bound copper in pyrite from the oka Marin polymetallic deposit, Serbia, by electron-probe micro-analysis (EPMA), micro-Raman spectroscopy and X-ray powder diffraction (XRPD). Varying contents of copper in pyrite, with values up to 8 wt.% Cu, result in band-like textures, oscillatory and sector zoning. We observed a correlation between increasing copper content and decreasing wavenumbers of Raman band positions and increasing band-widths. Moreover, the lattice parameter of 5.422 Å for Cu-bearing pyrite is greater than that for pure pyrite. Besides pyrite with structurally bound copper, a texturally different type of pyrite was observed in the same sample. The latter also contains copper, but only in the form of admixed copper-bearing minerals. We propose that pyrite with structurally bound Cu was formed by the recrystallization of colloform pyrite enriched in copper.

Keywords: pyrite, structurally bound copper, mineral inclusions, zoning, electron-microprobe data, micro-Raman spectroscopy, powder-diffraction data, oka Marin polymetallic deposit, Serbia.