Mineral Chemistry and Thermo-Barometry of Misho Mafic Complex, Southwestern of Marand Town, East Azarbaidjan Province

Ghorbani, M; Hosseinzadeh, M.R

doi:10.22071/gsj.2015.42919

Mineral Chemistry and Thermo-Barometry of Misho Mafic Complex, Southwestern of Marand Town, East Azarbaidjan Province

Document Type : Original Research Paper

Authors

M Ghorbani ¹

M.R Hosseinzadeh ²

¹ M.Sc., Department of Geology, Faculty of Natural Sciences, Tabriz University, Tabriz, Iran

² Associate Professor, Department of Geology, Faculty of Natural Sciences, Tabriz University, Tabriz, Iran

10.22071/gsj.2015.42919

Abstract

The mafic-ultramafic complex of Misho is exposed in in the northwestern part of Iran, in the East Azerbaidjan province (southwest of Marand). This complex intruded in the older rock units including the Kahar formation and resulted in developing of contact metamorphic rocks. Compositionally, the mafic portion is gabbronorite, troctolite and olivine-gabbronorite; and the ultramafics are harzburgite to lherzolite. The EPMA analyses of main minerals in mafic rocks (gabbro) show that plagioclases are anorthite to bytownite, Olivines are mainly chrysolite, orthopyroxenes have enstatitic composition, clinopyroxenes are diopsidic and amphiboles are tschermakite, to tschermakitic hornblende. Geothermobarometery of gabbros based on varions methods (Al2O₃ and TiO₂ in amphibole, plagioclase - amphibole and orthopyroxene – clinopyroxene) yield 700- 900ºC in pressure of 7-8 kbar.

Keywords

Mafic – ultramafic rocks

Mineral-chemistry

Thermo-barometry

Misho

Marand