QE383 : Mineralogy, geochemistry and genesis of the Saghary copper deposit, south of Shahrood
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2018
Authors:
Yeganeh Khoramtash [Author], Farajollah Ferdoust[Supervisor]
Abstarct: Saghari copper deposite in 120 Km south of shahrood, part of volcanic-sedimentary Troud-Chah shirin belt has facies in the northen edge structural-sedimentary zones of Central Iran. Field and petrographical studies, deposit area, consist of andesite, basaltic andesite, basalt, dacite, tuff and aglomerate that indicate Eocene. The rock are high-K, calc-alkaline in nature and are formed a magmatic arc setting in a subduction zone. Mineralization in saghari areas occurred as vein-veintle along the fault planes in a lava and pyroclasric units. The mineral is formed as veins an vein-veintle, cavities, open space filling and disseminated. Fractures resulting from operation of faults in the rocks of the region have created a favorable location for the influence of hydrothermal solution and it is considered as the main controller of mineralization. According to the field observations and mineralogical studies, the mineralization in the region was carried out in two stages: hypogene (pyrite and chalcopyrite) and supergene (chalcocite, covellite, malachite and chrysocolla). The most textures observed in the occurrence of mineralization include vein-veintles, disseminated, replacement, open space filling, colloform and banded. Alterations include: argillitic, sericitization, carbonatization and oxide-Fe and chloritization. In chondrite and primitive mantle normalizing diagrms they have significant enrichment in LREE (K and Pb) and HFSE (Nb and Ti) witch is related to the subduction zone. In variation diagrams there is a continuous trend between the mentioned rocks and indicates that they evolved by fractional crystallization. Geochemical studies indicate that copper has only relative correlation with silver. Since silver has not founded as an indepnded crystalline phase. The results of fluid inclusion studies, frequency homogeneous temperature and salinity fluid in the Saghari copper deposite is respectively 100-140°C and 5/6-15/7 Wt%NaCl. This system was related to evolution of mineralizing hydrothermal fluids and their mixing with cold and low salinity meteoric waters causing in element and mineralogical zonations. baxsed on petrography, structural control of mineralization, alteration type and its extention and simple mineralogy, fluid inclusion and geochemical studies, it can be concluded that mineralization at Saghari district has characteristics of an individual mineralization system. This system is related to evolution of hydrothermal fluid mineralization resulted in vein-veintle Cu (low-sulfidation epithermal) mineralization.
Keywords:
#copper #Epithermal Vein #mineralogy #Geochemistry #Eocene #Saghari #Troud-Chah shirin Link
Keeping place: Central Library of Shahrood University
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