A. Maghsoudi; M. Yazdi; M. Mehrpartou; M. Vosooghi Abedini
Abstract
The Mirkuh Ali Mirza gold mineralization is located in north Sarab in the Western Alborz–Azerbaijan structural zone. Mineralization was formed in the form of a vein occurring in Neogene dacitic and rhyodacitic tuff along a series of NW–SE trending fault; Mineralization associated with quartz-sericite-adularia-calcite ...
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The Mirkuh Ali Mirza gold mineralization is located in north Sarab in the Western Alborz–Azerbaijan structural zone. Mineralization was formed in the form of a vein occurring in Neogene dacitic and rhyodacitic tuff along a series of NW–SE trending fault; Mineralization associated with quartz-sericite-adularia-calcite and pyrite(<1%) assemblages is a typical of low-sulfidation epithermal gold mineralization. The fluid inclusion data from quartz minerals indicate homogenization temperature of 161-260°C and salinities of 0.5 to 6.5 wt% NaCl equiv. The variation in gold grade in quartz vein is 270-3240 ppb. The highest gold content is in lattice and breccias quartz that can indicate direct relationship between boiling to gold deposition. The idea is supported by coexistence of vapor-dominant and liquid-dominant fluid inclusions.
M. Sakhdari; M. Yazdi; M. Behzadi
Abstract
The Shanegh area is located in central part of Sanandag-Sirjan zone, 28km southeast of Delijan. Rock units exposing in the area consists of sedimentary (carbonate, sandstone, siltstone) volcano- sedimentary (andesite to andesitic tuff, tuff) and intrusive host rocks. The volcano- sedimentary units thought ...
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The Shanegh area is located in central part of Sanandag-Sirjan zone, 28km southeast of Delijan. Rock units exposing in the area consists of sedimentary (carbonate, sandstone, siltstone) volcano- sedimentary (andesite to andesitic tuff, tuff) and intrusive host rocks. The volcano- sedimentary units thought to be of Eocene to Quaternary ages which have been intruded by plutonic units. The main host rocks are monzonite, quartz monzonite, andesite and diorite. The host rocks have been altered by pervasive hydrothermal fluids. The alterations are sericitization, kaolinitization, carbonatization and silicification. The host rocks are characterized by fault or shear zones, vein systems, stockwork and dyke mineralization. Ore mineral assemblages are pyrite, chalcopyrite, Fe-oxide and Fe-hydroxides. We did not find gold minerals in our microscopic studies but the gold has been found in the lithogeochemical exploration. The results show that maximum grade of gold in some veins is about 2760 ppb and the mean grade of gold about 80 ppb. Comparing shanegh area main characteristics with epithermal gold deposits, shanegh area has the most similarities with epithermal gold mineralization; therefore, it is considered to be of this type.
A. Maghsoudi; M. Yazdi; M. Mehrpartou; M. Vosoghi Abedini
Abstract
The Mirkuh Ali Mirza area is situated at north of Sarab, NW of Iran. The study area is located in in Meshkin Shahr 1:100000 geological sheets at western Alborz–Azerbaijan structural zone. The major exposed rocks in the area are the Eocene and Neogene volcanic and subvolcanic rocks which include ...
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The Mirkuh Ali Mirza area is situated at north of Sarab, NW of Iran. The study area is located in in Meshkin Shahr 1:100000 geological sheets at western Alborz–Azerbaijan structural zone. The major exposed rocks in the area are the Eocene and Neogene volcanic and subvolcanic rocks which include rhyolitic and dacitic tuff with intermediate to basic rocks. Recent geochemical stream sediment (1:25000 scale) and litogeochemical surveys showed base and precious metals in the form of veins at the periphery of a porphyry copper deposit model. Occurrence of this mineralization can be a small part of a big hydrothermal fluids circulation that its effects were developed in large scale up to 10km2 to porphyry copper mineralization. The mineralization model follow as; porphyry copper in center, gold and other base metals in periphery, anomalous concentration of Ag, As, Sb, Pb and Zn in more distal relative to central body and Mn, Ba and Hg can be found at the outer part of the system
