Tectonic Setting of Metabasites of the Neo-Tethyan Oceanic Remains in Sanandaj-Sirjan Structural Zone, West of Isfahan, Central Iran

The study area is located in west of Isfahan, Shahrekord-Dehsard terrene. This area is the part of Sanandaj-Sirjan structural Zone. In this area, metamorphosed igneous outcrop contain of greenschist and metabasite rocks. These rocks have metmorphed in greenschist facies and belong to the age of Triassic-Jurassic. The Metabasite is mainly composed of plagioclase, amphibole, epidote and chlorite. Geochemical data shows that parent rocks are basalt to andesitic 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. These results indicated that metabasite generated back arc basin volcanic subduction environment. Metabasite in Sahrekord - Dehsard terrene shows remnants of Neo-Tethyan oceanic lithosphere with back arc basin environment that was subducted and uplifted to the surface.