Lead isotope data from the Sar-Cheshmeh porphyry copper deposit,Iran |
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| Authors: | J Shahabpour J D Kramers |
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| Institution: | (1) University of Kerman, Islamic Republic of Iran, P.O. Box 76135-955, Kerman, Iran;(2) Department of Geology, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe |
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| Abstract: | Lead isotope compositions of nine sulfide concentrates from ore samples from the Sar-Cheshmeh deposit are reported. They range from virtually unaltered granodiorite through varying degrees of potassic alteration to ores showing strong phyllic alteration (sericite veins). The samples without strong phyllic alteration have fairly uniform lead isotope compositions around 206Pb/204Pb=18.6, 207Pb/204Pb=15.6, and 208Pb/204Pb=38.7. Two samples with sericite veins have markedly more radiogenic lead. It is concluded that the fluid responsible for the potassic alteration and the associated mineralization was essentially magmatic, whereas convecting meteoric water from the country rock acted as a mineralizing solution during phyllic alteration. In the context of the plumbotectonics model, the deposit has a typical orogen signature intermediate between primitive and mature island-arc settings. |
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