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You are here: Home » Past Issues » Volume 7, 2012 - Number 2 » THE CISMA DEPOSIT, BAIUT DISTRICT, EASTERN CARPATHIANS, ROMANIA: SPHALERITE COMPOSITION AND FORMATION CONDITIONS


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Olga Yu. PLOTINSKAYA1, Vsevolod Yu. PROKOFIEV1, Gheorghe DAMIAN2, Floarea DAMIAN2 & Bernd LEHMANN3
1Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences (IGEM RAS), Moscow, Russia (plotin@igem.ru)
2North University of Baia Mare, Romania, 62A Dr. Victor BabeĊŸ Street, 430083 Baia Mare, Romania, e-mail: damgeo@ubm.ro & loricadamian@ubm.ro
3Mineral resources, Technical University of Clausthal, Germany (bernd.lehmann@tu-clausthal.de)

THE CISMA DEPOSIT, BAIUT DISTRICT, EASTERN CARPATHIANS, ROMANIA: SPHALERITE COMPOSITION AND FORMATION CONDITIONS

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Abstract:

Sphalerite at the Cisma deposit (Baiut ore district, Eastern Carpathians, Romania) occurs in two generations formed in different environments. Sphalerite-1 is characterized by a negative correlation between Fe and Mn and precipitated under equilibrium conditions. Sphalerite-2 was deposited in a non-equilibrium environment; it contains chalcopyrite inclusions and shows positive correlation of Fe and Mn. Fluid inclusion data on quartz identify boiling and point to depositional temperatures of 270 to 316oC in the Bandurita vein and 143 to 344oC in the Cisma vein at a paleo-depth of 500-800 m. Salinity (Na- and Mg-chloride) is less than 10 wt.% eq. NaCl for both veins. The various zoning patterns in sphalerite derive from a combination of boiling, cooling, and dilution of the ore-forming fluid.


Keyword: epithermal, base metal, Baia Mare, Baiut, sphalerite, fluid inclusions


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