Petrology and geochemistry of Misho mafic and A2 granite rocks in southeast Marand, NW Iran

زمین شناسی اقتصادی

Article 3, Volume 5, Issue 2 - Serial Number 9, January 2014, Pages 215-233   

Document Type: Research Article

DOI: 10.22067/econg.v5i2.31797

Authors

Maryam Ahankoub^{* 1}; Ahmad Jahangiri²; Mohsen Moayyed²

¹Payame Noor

²Tabriz

Abstract

Misho intrusions outcrop in the southern part of North Tabriz fault, east Misho Mountains, NW Tabriz. Filed studies, petrological and geochemical data show that both mafic and felsic rock types occur in the area. Mafic rocks include gabbro consisting of plagioclase, clinopyroxene, olivine and opaque minerals and felsic bodies consist of alkali granite with K-feldspar, quartz, plagioclase and a few grains of biotite and amphibole. Mafic rocks have higher enrichment in LREEs than in HREEs. Also, the mafic rocks are rich in LILEs and poor in HFSEs.
Geochemical characteristics of the gabbros show that they formed as a result of interplay between a depleted asthenospheric mantle and an upwelling mantle plume, while granitic rocks are alkaline and metaluminous to peraluminous rich in LILEs especially Rb and Th and poor in Nb, Sr, Eu, Ba,Ti. Geochemical characteristics of the granites belong to A-type granites and A2 subgroup that formed in an extensional tectonic setting of the post collision in active continental margin by lower crustal melts.

Keywords

Petrology; Geochemistry; NW Iran; A2 granite; Tholeiitic gabbro; East Misho

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