Geochemistry, protolith and tectonic setting of serpentinites from the Neyriz ophiolitic complex in the south of Bavanat (Fars Province)

Authors

1 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran

2 Department of Geology, Faculty of Sciences, University of Lorestan

3 Department of Geology, Shiraz Branch, Islamic Azad University, Shiraz, Iran

4 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran.

Abstract

The south of Bavanat area is located in the high Zagros zone and it is considered a part of the Neyriz ophiolite. In this area, the ophiolitic complex is small coloured melanges include radiolarite cherts and serpentinites. The serpentinites composed of serpentine, spinel, opaque (as residual minerals from protholith), amphibole, rarely olivine and pyroxene. Olivines have been highly altered to serpentine and pyroxenes to bastite. Low values of Al2O3 and very low TiO2 against high values MgO, Cr, Ni and V in these serpentinites indicate the protholith of harzburgite- dunite tectonites. Also, very low values of CaO in these serpentinites indicate the low amount of clinopyroxene in the protholith and its harzburgite-dunite type. Based on the chemistry of the major, minor and rare elements, the primary peridotites that make up these rocks are formed in the suprasubduction-fore arc zone from a mantle affected by the reaction with the melt (melt-rock reaction) resulting from the subducted plate.

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History

  • Receive Date: 25 January 2023
  • Revise Date: 19 April 2023
  • Accept Date: 25 April 2023

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