Geothermobarometry and petrogenesis of Chahar Dahane peridotites, West margin of Makran zone, Hormozgan province, Iran

Document Type : Original Article

Authors

Abstract

The study area known as ‘Chahar-Dahaneh’ is part of the Iranian southeast ophiolites related to Alpian-Himalayan Mesozoic orogeny belt, and is located in the western margin of the Makran subduction zone. Chahar Dahaneh peridotite section consists of three major lithologies including: 1.dunite lenses 2. harzburgites and 3. Lherzolite. Based on electron microprobe analysis ,we estimated pressure of 5kb with 10%wt H2O for magma with temperature of about 1150-1200C for the origin of clinopyroxene crystallization and chrome spinels are ferrian palenaste in composition. Enrichment of Al3+ ratio to Fe3+ in spinels from lehrzolites suggest that they formed in lower oxygen fugacity and higher pressure than those spinels in dunites and olivines are forsterite in type with  88-91 Mg#. Based on microprobe datas, Chahar Dahaneh peridotites are related to back arc metasomatised mantle in SSZ tectonic setting.

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 28, Issue 3 - Serial Number 79
October 2020
Pages 723-734

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  • Receive Date: 23 September 2019
  • Revise Date: 24 December 2019
  • Accept Date: 25 January 2020

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