Mineralogy of telluride-bearing epithermal ores in the Kassiteres-Sappes area, western Thrace, Greece |
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| Authors: | P Voudouris M Tarkian K Arikas |
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| Institution: | Department of Mineralogy and Petrology, University of Athens, Greece
Mineralogisch-Petrographisches Institut, Universit?t Hamburg, Germany
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| Abstract: | Summary The Kassiteres-Sappes district represents a multi-centered, porphyry-epithermal system developed during the Oligocene to Miocene
at a composite calc-alkaline to high-K calc-alkaline volcanic edifice. Precious and base metal mineralization postdates the
emplacement of dacite and rhyolite porphyries and is partly superimposed on earlier microdiorite-related porphyry-style mineralization
exposed at the Koryfes Hill prospect. A second mineralized porphyry-type system genetically related to a dacite porphyry body
developed near the St Demetrios deposit. Tellurides occur mainly at the St Barbara prospect and the St Demetrios deposit.
Based on petrographic, electron microprobe, and scanning electron microscope analyses, hessite, petzite, sylvanite, altaite,
stützite and native tellurium occur in the St Barbara prospect. These tellurium-bearing minerals are hosted in intermediate-sulfidation
type veins and accompanied by pyrite, chalcopyrite, tetrahedrite-group minerals, galena and native gold/electrum. The St Demetrios
mineralization includes hessite, altaite, stützite, and tetradymite in close spatial relation to a high-sulfidation assemblage
composed of enargite, chalcopyrite, goldfieldite, and native gold. Tellurides were deposited at logfTe2 values of −8.5 to −7.1 and logfS2 values of −10.7 to −7.9 (275 °C). The ore systems are characterized by Au, Ag, Te, Bi, and Mo, which suggests a magmatic
contribution to the mineralizing fluids. Ore-forming components were likely derived from both the dacite and rhyolite porphyries. |
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