Volume 17, Issue 1 (4-2009)                   www.ijcm.ir 2009, 17(1): 3-16 | Back to browse issues page

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Abstract:   (2012 Views)

The Muteh gold district is located about 70 km northeast of Golpaygan within Sanandaj-Sirjan metamorphic zone of Zagros Structural Belt. Geological studies show that the area had been under poly - phase metamorphism. Gold mineralization occurs in metamorphic complex which consists mainly of green schists, meta-volcanics, and gneisses. Shear zones are the host of gold mineralization, and intense alterations occur along the normal faults. Gold paragenesis minerals include pyrite, chalcopyrite, pyrrhotite and secondary minerals. There is three generation of pyrites. This contribution is aimed to improve our knowledge of understanding the source of the ore-bearing fluids in this area. In this regard, fifteen samples were selected for hydrogen, oxygen and sulfur isotope studies. The mean values of 12.4‰ and -42‰ for δ18O, and δD isotopes with the mean value of 7.75‰ of calculated fractionation factors for δ18OH2O from quartz veins indicate that metamorphic host rocks are the most important source for the fluids and gold mineralization in the Muteh area. Gold mineralization is closely associated with intense hydrothermal alteration along the ductile shear zones. However, our observation shows that the characteristics of the gold mineralization in the study area are also similar to that of other hydrothermal with magmatic origin. Five available sulfur isotope (δ34S) data are highly variable (+2.2, 6.6, 9.1, 13.9, and 16.9‰) even from the same type of hosted rocks. The isotope data, suggest that the source of sulphurs were not homogenous. Based on sulfur isotope compositions at Muteh gold district, it can be concluded that several different sources or processes could account for the sulphide fluids. The δ34S values in the studied area demonstrate that source of sulphides are mainly derived from the metamorphism fluids though   hydrothermal fluids related to magmatic activities.

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Type of Study: Research | Subject: Special
Received: 2017/05/27 | Accepted: 2017/05/27 | Published: 2017/05/27