1- Science and Research Branch, Tehran, Iran
Abstract: (562 Views)
Khankshi copper deposit located in central province 80km southwest of Tehran province. This deposit is formed by sequence of volcanic and pyroclastic rocks that are mostly entailed of trachyandesite and andesite rocks from Eocene age. The substitution of framboidal pyrite by chalcopyrite and bornite in the form of micro spherical crystals in initial micrite alongside with pyroclastics and dependent tuff-breccia are representative of volcanic cycle in which copper mineralization in the form of strata bound occurred. Accordingto the availability of similar minerals, propylitic alteration besides other alterations are normal alteration of Khankshi that its intensity in host rock mineralization is higher. Due to XRD studies albite, calcite, quartz and kaolinite minerals are present in the main phase that indicates more presence of propylitic alteration in comparison to argillic alteration and iron oxidation in this phase. This area geochemical studies indicates the occurrence of volcanism so that rock of this area are volcanic ones and from magmatic series point of view these rocks have high alkaline potassium nature and in terms of tectonic perspective because of tensile process these rocks are located at the edge of arcuate basin. Fluid inclusion’s research shows homogenization’s temperature between 129.4to227.1 and range of salinity is varied between 1.9 to 13.4 of salt (NaCl) weight percent. The depth fluid trapping in this deposit is less than 200 meter and pressure is less than 74 bar. This deposit according to geological properties, mineralogy, fabric and structure, geochemical and fluid inculsion data is comparable with manto copper deposit.
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