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Petrogenesis of greenstones in south tiran (West Isfahan), central Iran

Zohreh Hossein Mirzaee, Ali-Khan Nasr-Esfahani

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J. Bio. Env. Sci.6(1), 654-664, January 2015

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Abstract

The study area is located in south Tiran (west of Isfahan); this area is the part of Shagrekord-Dehsard terrain in Sanandaj – Sirjan structural Zone. These rocks have Triassic to Jurassic ago. These detected mafic volcanic primary structures. This is mainly composed of plagioclase, amphibole, quartz, opaque, epidote and chlorite and indicated greenschist fancies regional metamorphic paragenesis. These are andesitic basalt to basalt composition with sub alkaline and tholeiitic trend. In the REE and Trace elements Spider diagrams, these similar to MORB and adapted with E-MORB. Greenstones in Sahrekord – Dehsard terrain show remnants of Neo-Tethyan Oceanic lithosphere with back arc basin environment that was subducted and uplifted to the surface. During the late Triassic- early Jurassic a new spreading ridge, the second Neo-Tethys, was created to separate the Shahrekord-Dehsard terrane from Afro-Arabian plate and developed back arc basin. The final collision between the Arabian plate and central Iran microcontinent occurred in the Neogene. Simultaneously, the second Neo-Tethys spreading and primary Neo-Tethys closing occurred in the upper Miocene and late.

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Petrogenesis of greenstones in south tiran (West Isfahan), central Iran

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