Geochemistry and origin of Gheshlagh peridotites and chromites, Khoy ophiolitic complex, northwest of Iran

Document Type : Original Article

Authors

1 Department of geology, Faculty of sciences, University of Zanjan, Zanjan, Iran

2 Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran

3 Institute of geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Abstract

The Khoy ophiolitic complex in NW Iran is a part of the Neo-Tethyan ophilite belt and contain several chromite mineralization such as Gheshlagh deposit. The Gheshalgh chromites occurred in the serpantinized dunites and harzburgites and display various thickness and geometries such lenzoid and textures include massive, dessiminated, leopard, vein-veinlets and breccia. Chromite associated with ferro-chromite and low amounts of sulfide minerals occurred as the most important mineral in the Gheshlagh deposit. The chemistry of Gheshlagh chromite show low Cr#, high Mg#, high Al2O3 and low TiO2 value. The geochemical data from the harzburgites and dunites in the Ghashlagh deposits show low values of SiO2, Al2O3, and CaO suggesting high depletion of these elements in the studied samples. The rare earth elements pattern in the Gheshalgh chromite are similar to those from the peridotite host rocks and show U-shape pattern. The geochemical data suggest the relationship of chromites and host harzburgites and dunites with abyssal peridotite and up to 20% partial melting degree as well interaction with subduction derived melts and fluids. Thus, the tectonic setting of the Gheshlagh ophiolitic complex is more likely imply to a back-arc setting.

Keywords

References

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  • Receive Date: 26 June 2024
  • Revise Date: 04 June 2024
  • Accept Date: 10 August 2024

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