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FLUID INCLUSION INVESTIGATIONS WITHIN THE SAR-CHESHMEH PORPHYRY CU DEPOSIT, IRAN

AUTHOR/S: HEZARKHANI, A.
Sunday 1 August 2010 by Libadmin2006

6th International Scientific Conference - SGEM2006, www.sgem.org, SGEM2006 Conference Proceedings/ ISBN: 954-918181-2, June 12-16, 2006, Vol. 1, 205-220 pp

ABSTRACT

Four main mineralized vein Groups within the Sar-Cheshmeh Porphyry system have been identified: I) quartz + molybdenite + anhydrite ± K-feldspar with minor pyrite, chalcopyrite and bornite; II) quartz + chalcopyrite + pyrite ± molybdenite ± Calcite; III) quartz + pyrite + calcite ± chalcopyrite ± anhydrite (gypsum) ± molybdenite; IV) quartz ± calcite ± gypsum ± pyrite ± Dolomite. Early hydrothermal alteration produced a potassic assemblage (orthoclase-biotite) in the central part of the stock, propylitic alteration occurred in the peripheral parts of the stock, contemporaneously with potassic alteration, and phyllic alteration occurred later, overprinting the earlier alteration. The early hydrothermal fluids are represented by high temperature (350 oC to 520 oC), high salinity (up to 61 wt % NaCl equiv.) liquid-rich fluid inclusions, and high temperature (340 oC to 570 oC), low-salinity, vapor-rich inclusions. These fluids are interpreted to represent an orthomagmatic fluid which cooled episodically; the brines are interpreted to have caused potassic alteration, and deposition of Group I and II quartz veins containing molybdenite and chalcopyrite. Propylitic alteration is attributed to a liquid-rich, lower temperature (220 oC to 310 oC), Ca-rich, evolved meteoric fluid. Influx of meteoric water into the central part of the system, and mixing with magmatic fluid produced deep albitization and shallow phyllic alteration.

Keywords: Porphyry, Sar-Cheshmeh, Iran

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