Tectonomagmatic characteristics of ophiolitic gabbroids from south Orzuieh (south of Baft, Kerman) ophiolite complex: insights from clinopyroxene chemistry.

Document Type : Original Article

Abstract

Mafic and ultramafic layered rocks located in south of Orzuieh (Baft, Kerman province), consist of plagioclase bearing ultramafic rocks (including olivine, orthopyroxene , clinopyroxene and plagioclase), olivine gabbros (including plagioclase, olivine, orthopyroxene and clinopyroxene) and gabbronorites (including plagioclase, orthopyroxene and clinopyroxene and amphibole) and constitute the mafic parts of the Orzuieh colored mélange complex. Mineral chemistry of clinopyroxene show diopside end-member which have Mg# ranging from 0.75 to 0.88. According to geothermobarometric calculations, temperatures change from 783 to 975ºC and pressure conditions vary from 1.4 to 3.6 kbar. Tectono-magmatic considerations show that these clinopyroxenes have been crystallized from tholeiitic to bonintic magmas which have already formed in an arc environment. Therefore, it could be considered that Orzuieh layered ultramafic and mafic rock series are some parts of ophiolitic complexes which occurred in a subduction setting.

Keywords

References

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  • Receive Date: 27 June 2017
  • Revise Date: 30 July 2017
  • Accept Date: 03 September 2017

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