Document Type : Original Research Paper

Authors

1 Department of Geology, Islamic Azad University, Mahallat Branch, Mahallat, Iran

2 Earth Science Department,Mahallat Branch,islamic Azad university,mahallat,iran

3 Geological survey and mineral exploration of Iran

4 Earth Science Department,Mahallat Branch,islamic Azad university,mahallat,ira

5 Geology Department, Faculty of Science, University of Bu- Ali Sina

10.22071/gsj.2022.314372.1951

Abstract

The Nineh deposit is a Pb-Zn deposit located in the Malayer-Esfahan metallogenic belt (MEMB) as stratabound and epigenetic mineralization hosted by middle-Jurassic limestone. The replacement and vein mineralization of galena, sphalerite with a minor amount of pyrite occurred in the foreland basin within the Orumieh-Dokhtar zone.
The microthermometery results of fluid inclusions trapped in calcite and barite, respectively, show homogenization temperature peak of 107 to 137°C and 150 to 170°C , and a salinity mode of 12.9 to 14.9wt.% NaCl equiv. and 4 to 6wt.% NaCl equiv.. The salinity vs. homogenization temperature diagram attests to cooling and mixing as the main mineralization mechanisms.
The δ34S values of sphalerite and galena are within the range of 9.5 to 21.5‰ and 7.5 to 19.5‰, respectively and is about 43.7‰ for barite, the wide range of the sulfur isotope values is consistent with originating from different sources. Additionally, the δ13C (0.1 to 0.5 ‰) and δ18O (-9.5 to -11.5‰) values of calcite samples are in accordance with marine carbonate source and a high interaction of the ore fluids with different sources. Accordingly, the deposit could be classified as Mississippi Valley type (MVT) deposit which undergone more W/R interaction due to multiple orogenic

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