Document Type : Original Research Paper
Authors
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
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.
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