Mineralization and geochemistry of major, trace and rare earth elements in Salardol Mn Deposit (west of Alashtar, Lorestan Province)


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

2 Department, Lorestan Agricultural and Natural Research and Education Center, AREEO, Khoramabad, Iran


Salardol manganese deposit is located 20km west of Aleshtar in the radiolarite subzone of Kermanshah ophiolite zone. The rock units include radiolarite, breciaition limestone and Cretaceous units. Manganese deposits are seen in the form of irregular lenses as interlayers with radiolarites. Manganese mineralization is visible in three generations. The first generation is syngenetic and is formed interlayer with radiolarity naps. The second and third generations are epigenetic, which can be seen in the form of streaks and mainly within the faults and seams and cracks of radiolarity. Mineralogically, XRD and SEM are important manganese paragenes including Ramsdellite, Romanechite, Rhodochrosite, Jacobsite, Bixbyite and the most important gangue minerals are quartz and calcite. Good agreement between Salardol manganese deposit and hydrothermal deposits has been confirmed by trace elements geochemical data, distinguishing diagrams and elemental ratios. The use of major and minor element ratios indicates the thermal conductivity of Salardol manganese reserves. Na/Mg ratio indicates the effect of fresh water on the formation of manganese reserves. The distribution pattern of normalized REE relative to chondrite indicates a positive Ce anomaly with an average of 20.1 and a negative Eu anomaly with an average of 0.47, which is clearly consistent with manganese hydrothermal deposits. According to the available evidence, the formation of Salardol manganese deposit due to the synthetic placement of primary manganese in the radiolaritic host rock and the epigenetic processes resulting from tectonic activities and under the influence of hydrothermal fluids has led to the formation of fossil-type reservoirs.


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