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Arabian Journal of Geosciences

, Volume 6, Issue 11, pp 4445–4461 | Cite as

Investigation on mantle peridotites from Neyriz ophiolite, south of Iran: geodynamic signals

  • Mohammad Ali Rajabzadeh
  • Teimoor Nazari Dehkordi
Original Paper

Abstract

Neyriz ophiolite in Abadeh Tashk area appears as four major separated massifs in an area with 125 km2, south of Iran. Peridotites including harzburgite, dunite, and lesser low-Cpx lherzolite are the major constituents of the ophiolite with very minor mafic rocks. Usual gabbros of ophiolite complexes are virtually absent from the study area. Mineral modality associated with bulk rock and mineral chemistry of the peridotites show a progression from fertile to ultra-refractory character, reflected by a progressive decrease in modal pyroxenes and in Al2O3, CaO, SiO2, Sc, Ta, V, and Ga values of the studied rocks by approaching chromite deposits. The Neyriz peridotites vary from low-Cpx lherzolite (MgO, 41.97–43.1 wt.%; Al2O3, 0.8–1.3 wt.%) with low content of Cr# spinel (36.7–37.6) and Fo olivine (90.79–91.5) to harzburgite (MgO, 44.31–45.25 wt.%;Al2O3, 0.29–0.45 wt.%; Cr# spinel, 58.2–73.45; Fo olivine, 91.23–91.56), and then to dunite (MgO, 45.9–49.2 wt.%; Al2O3, 0.18–0.48 wt.%) with higher content of Cr# spinel (74.34–79.36) and Fo olivine (91.75–94.68). Compared to modern oceanic settings, mineral and rock composition of low-Cpx lherzolite plot within the field of mid-ocean-ridge environment, whereas those of harzburgite and dunite fall in the field of fore-arc peridotites. As a result of the studies on minerals and whole rock chemistry along with rock interrelationships, we contend that the peridotites were subsequently affected by percolating hydrous boninitic melt from which the high-Cr–Mg, low-Ti chromitites were formed within mantle wedge above the supra-subduction zone in a fore-arc setting.

Keywords

Mantle peridotite Ophiolite Geodynamics Neyriz Iran 

Notes

Acknowledgments

M. Ohnenstetter and D. Ohnenstetter (CNRS, Nancy, France) are greatly acknowledged who kindly provided helpful comments during this study. The authors wish thanks the personnel at Service Communications, University Nancy II, France for their help with microprobe analyses. The authors would like to thank the Research Council of Shiraz University for financing this research. We express gratitude to Engineer Parsaei from Fars Chromite Industrial Mining Company, who provided field work possibilities.

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Copyright information

© Saudi Society for Geosciences 2012

Authors and Affiliations

  • Mohammad Ali Rajabzadeh
    • 1
  • Teimoor Nazari Dehkordi
    • 1
  1. 1.Department of Earth Sciences, Faculty of SciencesShiraz UniversityShirazIran

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