2018 Volume 9 Issue 2 Special Issue
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Potential Mapping of Chromite Deposits of South-West Sahneh Ophiolites in Kermanshah Province


Mahshid Nozarifar*, Taghi Nabai, Seyed Reza Mehrnia
Abstract

The ophiolite complex of Sahneh is considered as a part of the sequences in Zagros suture zone. The studied ophiolite complex dating back to the late Cretaceous (Maastrichtian), formed in the two north and south ore body has been occurred in the southwest of Sahneh. In this complex, there is no complete ophiolitic sequence and generally, the existing lithologies of the region in the order of frequency consist of serpentinized ultramafic (harzburgitic peridotite, serpentine, dunite). The apical minerals analyzed in the polished sections in the order of frequency are magnetite, chromite and pyrite with less frequency, respectively. Chromium lenses are located in severely serpentinized harzburgites. Primary textures in chromite include cataclastic and lattice texture. The presence of cataclastic texture indicates active tectonics in the region, which causes corrosion in the chromites. The geochemical investigations of 7 rock samples by ICP-OES method and statistical approaches are indicated that the iron and chromite of the studied area have a remarkable and positive correlation with the presence of chromite in the mineralogical studies. The average of the main elements and mineralization factors in the region are Cr 493 ppm and Mg (ppm 03/0) and AL (2133 ppm) and FE (4490 ppm) and Ni (3255 ppm). Cadmium is an element that remains in acidic environment and is washed out in alkaline conditions from the environment. The presence of this element in the samples is due to change in the properties of the mineralization solutions of the region from acidic to alkaline conditions. Also, the presence of an element such as scandium with the high melting point implies the magnetism of magmatism of the region.


Issue 2 Volume 16 - 2025