Writers : Fazel Valipour, M.E.; Ghodsi,J.
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

The ophiolite complex of Mashhad with outcrops of mafic and ultramafic rocks are being widespread in southwest to northwest of Mashhad. This complex has been separated in two main ranges, one of which is located in south and southwest with majority of igneous and sedimentary fragments and the other one is located in northwest near the Veirany village including mafic and ultramafic rocks from ideal ophiolite complex. The chemical and spider diagrams which have been drawn from major and trace elements of this complex identified geochemical origin of tholeitic, tectonical position of ocean floor and existence of harzburgite residuals in base of this complex with high partial melting and high extensive velocity. Studies show this ophiolite complex is related with HOT harzburgite type. The existence of fragments in ophilitic complex and metamorphic rocks accompanying them are inside the upper Permian granites of Mashhad to Triassic showing replacement of the ophiolitic complex on Irans crust which has been occurred before Triassic.