The study of geochemistry and mineralogy of the adakitic rocks in Monavvar village, North of Tabriz, NW of Iran
Subject Areas :Mahdieh Fazelihagh 1 , Nasir Amel 2 , Ahmad Jahangiry 3
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Keywords: Adakitic rocks Post collisional thickened crust Monavvar Tabriz.,
Abstract :
The study area is located 35 kilometers northwest of Tabriz. Based on stratigraphic evidences, age of volcanic rocks in Monavvar area is Mio-Pliocene and Plio – Quaternary. According to geological structure, it is part of the western Alborz – Azerbaijan zone. Most of the volcanic rocks are dacite, rhyodacite, andesite, basaltic andesite and trachyandesite. In the spider diagrams these rocks show enrichment of HREE and HFSE elements over LREE and LILE, depletion and negative anomalies for Ti, Nb and Ta (TNT) and Ba/Nb, Ba/Ta. These properties indicate that their formation could occur in the continental arcs and post collisional arcs. High levels of SiO2 equal to 55 to 66 %wt, low levels of MgO, Y, Yb and Sr/Y and La/Yb represent the formation of high silica adakitic magma in the region. According to this evidence and REE distribution patterns, formation of magma was probably from asthenospheric mantle garnet – lherzolite source.
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