Journal Paper

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Journal: ژئوشیمی
Year:1395 | Volume:5 | Issue:2
Start Page:157 | End Page:169

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Title

GEOCHEMISTRY OF THE HOST DOLOMITIC ROCK AND MICROTHERMOMETRY OF DARREH-ZANJIR ZN-PB DEPOSIT, YAZD PROVINCE

Pages

 Start Page 157 | End Page 169

Abstract

 Darreh-Zanjir deposit is located 30 km southwest of Yazd city at the central Iran structural zone. The Cretaceous limestone is hosting Zn-Pb deposit that generally affected by DOLOMITIZATION. Mineralization is mainly controlled by fault-fracturing, brecciated zones and dissolution cavities. Mineral assemblage is simple and includes sphalerite, galena, cerussite, smithsonite, hemimorphite, calcite and dolomite. Mineralization occurred mainly in the dolomitized carbonate rocks. DOLOMITIZATION took place early in the course of mineralization and is followed by late stage sulfide deposition. Geochemical investigation indicates that the host dolomitic rock is stoichiometric and formed in a reducing environment during burial diagenesis in an open system. Based on geochemical data of dolomitized host rock, the Sr content increased in dolomite relative to mineral deposit, and Sr reduce with increasing distance from deposit. FLUID INCLUSION petrography on sphalerite displays that almost FLUID INCLUSIONs are two phases (L>V). Micro thermometry results show that homogenization temperature varies from 80 to 187oC and the salinity ranges between 7 to 20wt% eq. NaCl. Moderate salinity (average 16% NaCl), low temperature (133oC) and absent of clathrate phase is indicator of basinal fluids. The diversity of FLUID INCLUSION results reflects two or more involved fluids with different chemical composition which control mineralization. Based on the results of this research, the DARREH-ZANJIR Zn-Pb deposit is comparable to Mississippi Valley Type (MVT) Zn-Pb deposits.

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