NDLI: Fluid inclusion and stable isotope evidence for the genesis of quartz-scheelite veins, Metaggitsi area, central Chalkidiki Peninsula, N. Greece

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Mineralium Deposita : Volume 32, Issue 5, August 1997

Mineralium Deposita : Volume 32, Issue 4, July 1997

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Fluid inclusion and stable isotope evidence for the genesis of quartz-scheelite veins, Metaggitsi area, central Chalkidiki Peninsula, N. Greece

Content Provider	Springer Nature Link
Author	Kilias, S. P. Konnerup Madsen, J.
Copyright Year	1997
Abstract	Scheelite mineralization accompanied by muscovite and albite, and traces of Mo-stolzite and stolzite occurs in epigenetic quartz vein systems hosted by two-mica gneissic schists, and locally amphibolites, of the Paleozoic or older Vertiskos Formation, in the Metaggitsi area, central Chalkidiki, N Greece. Three types of primary fluid inclusions coexist in quartz and scheelite: type 1, the most abundant, consists of mixed H2O-CO2 inclusions with highly variable (20–90 vol.%) CO2 contents and salinities between 0.2 and 8.3 equivalent weight % NaCl. Densities range from 0.79 to 0.99 g/cc; type 1 inclusions contain also traces (<2 mol%) of CH4. Type 2 inclusions are nearly 100 vol.% liquid CO2, with traces of CH4, and densities between 0.75 and 0.88 g/cc. Type 3 inclusions, the least abundant, contain an aqueous liquid of low salinity (0.5 to 8.5 equivalent weight% NaCl) with 10–30 vol.% H2O gas infrequently containing also small amounts of CO2 (<2 mol%); densities range from 0.72 to 0.99 g/cc. The wide range of coexisting fluid inclusion compositions is interpreted as a result of fluid immiscibility during entrapment. Immiscibility is documented by the partitioning of CH4 and CO2, into gas-rich (CO2-rich) type 1 inclusions, and the conformity of end-member compositions trapped in type 1 inclusions to chemical equilibrium fractionation at the minimum measured homogenization temperatures, and calculated homogenization pressures. Minimum measured homogenization temperatures of aqueous and gas-rich type 1 inclusions of 220°–250 °C, either to the H2O, or to the CO2 phase, is considered the best estimate of temperature of formation of the veins, and temperature of scheelite deposition. Corresponding fluid pressures were between 1.2 and 2.6 kbar. Oxygen fugacities during mineralization varied from 10−35 to 10−31 bar and were slightly above the synthetic Ni-NiO buffer values. The fluid inclusion data combined with δ18O water values of 3 to 6 per mil (SMOW) and δ13C CO2− fluid of −1.2 to +4.3 per mil (PDB), together with geologic data, indicate generation of mineralizing fluids primarily by late- to post-metamorphic devolatilization reactions.
Starting Page	581
Ending Page	595
Page Count	15
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	32
Issue Number	6
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-10-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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Fluid inclusion and stable isotope evidence for the genesis of quartz-scheelite veins, Metaggitsi area, central Chalkidiki Peninsula, N. Greece

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