Mineralogy and fluid inclusions investigation of the conglomerate-hosted Gharmorvarid occurrence, Southwest Arak, Iran

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Document Type : Research Paper

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Department of Geology, University of Isfahan

Abstract

The Gharmorvarid ore occurrence in southwest Arak, Iran is located within the Malayer-Isfahan metallogenic province, which is hosted by a basal conglomerate of the Early Cretaceous Formation. Mineralization consists of galena and pyrite with trace amounts of chalcopyrite and sphalerite. Ore occurs as disseminated, replacement, mottled, and space-filling style. The gangue is dominated by quartz, ankerite, siderite, Fe-dolomite, calcite, sericite, biotite, chlorite, and minor barite. Our findings indicate a sequence of events during ore formation: euhedral quartz and fine-grained sulfide minerals are hosted within earlier diagenetic carbonate, galena with pervasive Fe-Mg-Mn-carbonate alteration occurred after them, leading to the dissolution (replacement) reaction in contact with quartz. Later minerals are characterized by coarse-grained quartz, galena, sericite, biotite, and chlorite. Primary fluid inclusions trapped in quartz and dolomite reveal that ore-forming fluid was intermediate saline, with a range from 3.7 to 16.2 wt% NaCl equiv. and had a medium to high temperature ranging from 151ºC to 330ºC. The mineralization is controlled by a fault-fold structure. Gharmorvarid mineralization is very similar to the sandstone-hosted Pb-Zn deposits along the margin of the Scandinavian Caledonides and in particular the Laisvall deposit in Sweden.

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Journal of Stratigraphy and Sedimentology Researches

Articles in Press, Accepted Manuscript
Available Online from 22 September 2024

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