Geochemistry and geothermometry in Jian copper deposit (Bavanat), Sanandaj-Sirjan zone, NE Fars Province

Authors

Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran

Abstract

The Jian (Bavanat) Cu deposit, located on the eastern edge of the Sanandaj-Sirjan metamorphic zone, southwestern Iran (195 Km northeast of Shiraz) is hosted by Surian Permo-Triassic volcano-sedimentary complex. Chalcopyrite is the major Cu ore and occurs as veins, veinlets and disseminations. The REE distribution patterns suggest that the protolith of the orebearing metamorphic host rocks (meta-volcanic and albite-epidote-chlorite schist) have of mafic volcanic origin in Jian deposit. Analytical data on metamorphic host rock show that LILEs, TTEs and REEs were depleted whereas HFSEs were enriched during the alteration. Fluid inclusion geothermometric measurements on cogenetic Quartz crystals indicate that copper mineralization is the result of metamorphic hydrothermal fluids acting at temperatures between 200 and 350 oC and salinities between 0.02 and 18 wt% NaCl equivalent at pressures below 300 bars, within greenschist to lower amphibolite metamorphic conditions. The brittle and ductile deformation regimes are the reason for the remobilization of metamorphic fluids and copper ore precipitation along wide ductile shear zones, lithological boundaries, and superficial fractures. Physico-chemical changes caused by the interaction of fluids and the metamorphic host rocks have provided the effective mechanisms for Cu ore precipitation by cooling and condensation, boiling, increased pH, ligands disintegration and decreasing H2O dielectric constant.
 

Keywords

References

 
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