Petrography and mineralography of copper deposits in South Kashmar area
Subject Areas :فرانک Fiezi 1 , S.E Haghighi-Bardineh 2
1 - استادیار گروه مهندسی اکتشاف معدن ، دانشگاه آزاد اسلامی، واحد تهران جنوب
2 - دانشجوی دکتری زمین شناسی اقتصادی، دانشکده علوم زمین، دانشگاه شهید بهشتی
Keywords: kashmar, Bardaskan, Petrography, Mineralography, copper deposits,
Abstract :
Dahaneh Siah, Cheshmeh Gaz, Zangalu and Cheshmeh Zelzeleh deposits are located in Kashmar1:250000 geological map in north of Doruneh fault. This area belongs to Sabzevar zone .According tolitho logic studies, the volcanic rocks vary in composition from Basaltic Andesite to Andesitic Basaltand Andesite as host rock and their adjacent rock units are Limestone and Tuffs. The mineralizationare occurred in contraction fractures around the Andesitic clasts and also disseminated in Andesitefractures. Dominant texture in Dahaneh Siah deposit is Porphiritic and Trachytic, Vesicular,Amygdaloidal are distinguished too. Plagioclases vary in composition between Oligoclase andAndesine. Biotite, green and Brown Hornblende have seen together and primary Pyroxenes containDiopside, Augite and Hypersthene. Inclusions of idiomorphic Appetites exist in Fe – Mg minerals orin matrix. Accessory minerals are Magnetite, Esphen and zircon. Vesicles are filled by Calcite,Chlorite and Quartz. Plagioclases altered to Clay minerals in Cheshmeh gaz deposit. The main mineralin Zangalu is Plagioclase and accessory minerals are altered Olivine and Pyroxene. Main minerals inCheshmeh Zelzeleh are Pyroxene and Plagioclase and accessory mineral is the Olivine which isAltered to Ferro oxide and Serpentine. There is no opaque mineral in polished sections of this deposit.Paragenesis of minerals in Dahaneh Siah, Cheshmeh Gaz and Zangalu contain: Magnetite → Pyrite →Chalcopyrite → Chalcocite → Bornite → Hematite → Covellite → Copper → Malachite →Chrysocolla → Lepidocrocite → Limonite.