Stable isotope geochemistry of carbonate minerals in supergene oxidation zones of Zn–Pb deposits
نویسندگان
چکیده
The O/O and C/C ratios of carbonate minerals formed by supergene oxidation of Zn–Pb deposits and submarine alteration of ancient slags were studied in order to constrain isotope fractionation factors for smithsonite, cerussite, and phosgenite, and to characterize conditions of nonsulfide ore formation. We present new isotope data of carbonate-hosted ores from the Iglesiente district (Sardinia, Italy) and Vila Ruiva (Portugal), as well as from the silicate-hosted ores of the Broken Hill district, New South Wales (Australia) and Freihung (Germany) and review previously published isotope data. The temperature dependence of oxygen isotope fractionation between Pb and Zn carbonate minerals and water below 240 °C for cerussite and below 100 °C for smithsonite and phosgenite can be expressed as 1000lnαcerussite–water 1⁄4 2:29ð106=T2Þ−3:56 1000lnαsmithsonite–water 1⁄4 3:10ð106=T 2Þ−3:5
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