Mineralogy, minerals-chemistry and sulfur isotope geochemistry of Baharieh copper deposit (NE Kashmar): implications for ore genesis

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Rezaeihamid Razieh; TALE FAZEL EBRAHIM

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Journal: PETROLOGY Year:2019 | Volume:10 | Issue:39 Page(s): 53-78

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Information Journal Paper

Title

Mineralogy, minerals-chemistry and sulfur isotope geochemistry of Baharieh copper deposit (NE Kashmar): implications for ore genesis

Author(s)

Rezaeihamid Razieh | TALE FAZEL EBRAHIM | Issue Writer Certificate

Keywords

Baharieh Cu depositQ1

mineral chemistryQ1

sulfur isotopeQ1

KashmarQ2

Sabzevar zoneQ2

Abstract

The Baharieh copper deposit with an approximately of 1 million tons of copper ore, located in Khorasan Razavi Province, 30 km northeast of Kashmar. On the base of structural view point of Iran, the deposit is situated in Sabzevar zone and Taknar metallogenic area. The mineralization as stratabound nature in an ore-horizon with a length of approximately 200 m and 5 to 10 meters thickness, trending E-W occurs in the middle Eocene andesitic to rhyolitic-tuff. Chalcopyrite and pyrite are the main sulfide minerals, which are accompanied by accessory minerals including bornite, galena, sphalerite, covelline, chalcocite, malachite and hematite. According to the data obtained by electron probe micro analysis (EPMA) the maximum gold amount (0. 21 wt%) and the silver content (0. 1 wt%) are in the chalcopyrite and the highest silver concentration (0. 14 wt%) is in the galena. The average ratio of Co/Ni (2. 71) in the pyrite study can be indication of its hydrothermal source. On the base of geo-thermometry data as well as Sb/Bi ratio in the galena and the geochemistry of the sphalerite (high content of Cd with an average value of 0. 92 wt% and low Zn/Cd=67. 54) the physico-chemical and the thermodynamic conditions of ore-bearing fluid in the Baharieh deposit consistent with an average-temperature hydrothermal-magmatic deposits. The variation ranges of δ 34S isotopic in the chalcopyrite and the pyrite samples vary from-7. 3 to 0. 5 ‰ . According to the results obtained from sulfur isotopic data, the origin of primary magma for δ 34S values close to zero and its relative depletion was confirmed as a result of performance of reduce processes for negative δ 34S values. The overall, the primary fine-grained pyrites in the mineralized host rock are most likely the source of sulfur in the sulfide mineralization of the area under study, which caused the negative δ 34S values.

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APA: Copy

Rezaeihamid, Razieh, & TALE FAZEL, EBRAHIM. (2019). Mineralogy, minerals-chemistry and sulfur isotope geochemistry of Baharieh copper deposit (NE Kashmar): implications for ore genesis. PETROLOGY, 10(39 ), 53-78. SID. https://sid.ir/paper/382304/en

Vancouver: Copy

Rezaeihamid Razieh, TALE FAZEL EBRAHIM. Mineralogy, minerals-chemistry and sulfur isotope geochemistry of Baharieh copper deposit (NE Kashmar): implications for ore genesis. PETROLOGY[Internet]. 2019;10(39 ):53-78. Available from: https://sid.ir/paper/382304/en

IEEE: Copy

Razieh Rezaeihamid, and EBRAHIM TALE FAZEL, “Mineralogy, minerals-chemistry and sulfur isotope geochemistry of Baharieh copper deposit (NE Kashmar): implications for ore genesis,” PETROLOGY, vol. 10, no. 39 , pp. 53–78, 2019, [Online]. Available: https://sid.ir/paper/382304/en

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