Document Type : Original Research Paper
Authors
1 Department of Geology, Faculty of Sciences, Ahvaz branch, Islamic Azad University, Ahvaz, IRAN
2 Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran
3 Department of Economic Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran
4 Department of Geography, Islamic Azad University, Ahvaz Branch, Ahvaz, Iran
5 Department of Geology, Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
Abstract
Baba-Ali and Galali iron deposits in west of Hamedan are emplaced within the Songhor volcano-sedimentary sequence of Sanandaj-Sirjan geological-structural zone. Mineralography and SEM-EDAX analyses on magnetite iron ores at both deposits for better understanding of mineralogy and crystal-chemistry of the ores have shown some interesting results. Studies on concentrations of some trace elements such as V, Co, Ni, Cu, Cr, Ti, Au, PGE as well as S and P impurities in the ore indicate that only some of the primary pyrites have considerable concentrations of Pt. It seems that other generations of pyrite and magnetite are depleted in these trace elements. Late stage hydrothermal fluids that lead to mineralization of pyrite in calcite-quartz gangue veins, have also been impotant for gold mineralization and pyrite has actually acted as a favorable carrier for Au. Detection of abundant phlogopite and trace element concentration patterns at Galali iron ore have strengthened volcanogenic magnesian skarn hypothesis.
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