Writers : Sadeghian,Mohammad;Ghasemi,Habibollah
Refference : 11th Symposium Of Geological Society Of Iran - Mashhad, Ferdowsi University
Publishing Year : 1386

Abstract :

From NW of Foroumad to SE of Neyshabour, in an area with more than 200 km length, Sabzevar ophiolitic zone intruded by numerous intrusions and extrusions(subvolcanics) in the form of batholith, stock, dike and dome(Chah Salar, Sheshtamad and Namen grnitoidic plutons and Zard Kuhi, Sarough, Kalateh Sadat, Kuh Sefid, Mehr and Sefid Nahr mainly rhyoltic domes). Their lithological composition ranges vary from diorite, quartzdiorite, granodiorite, tonalite to granite and from andesite, trachyandesite, dacite to rhyolite, in respectively. Their host rocks include harzburgite and basalts of ophiolitic complex (Late Cretaceous and Early Paleocene) and in some cases, volcanic and volcanosedimentary rocks with Eocene age. Some fragments of host rocks have been found in these igneous bodies such as enclaves.
They have metaluminous to weakly peraluminous nature and belong to medium to high potassium calcalkaline series. The studied granitoidic plutons are I-type and VAG. Extrusive rocks with rhyolitic composition and less than dacite, trachyandesite and andesite show geochemical features of adakites and adakitic rocks. Based on the carried out studies, these rocks have been produced by fractional crystallization and contamination of magmas that resulted from partial melting of the subducted oceanic slab or slabs (metamorphosed up to amphibolite or eclogite) and/or from melting of metasomatized mantle wedge.

Subject List : Ophiolite