Geothermobarometry of Sahneh, Harsin-Nourabad ultramafic rocks (NE-Kermanshah)

Document Type : Original Article

Authors

Abstract

Sahneh, Harsin-Nourabad ophiolits (Kermanshah Provience) located in outer Zagros ophiolitic zone and are parts of the Cretaceous ophiolitic belt, as remnants of southern branch of the Neo-Tethys Ocean obducted over the Arabic–Tauric platform from Oman to northwestern Syria, Cyprus and Antalya. Calculation of Fe/Mg separation coefficient of olivine indicates the mantle origin of this mineral. Textural evidence of ultramafic rocks displays clear evidence of cooling with decompression, partial melting and melt-rock reactions. Tectonomagmatic discrimination diagrams show that peridotite samples are located in olivine- spinel mantle array and SSZ peridotite field. Based on geothermobarometry calibration the temperature and pressure of crystallization of harzburgite and lherzolite rocks were 1100 to 1500 ° C and 12 to 18 Kbar and the wehrlite sample was 1200 to 1500 ° C and 21 to 23 Kbar, which corresponds to the SSZ tectonic environment.

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 29, Issue 4 - Serial Number 84
December 2021
Pages 823-836

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  • Receive Date: 10 March 2021
  • Revise Date: 11 April 2021
  • Accept Date: 15 May 2021

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