Writers : Khanalizadeh, A. R.; Farsi, Z.; Sadeghian, M.
Refference : The Forth National Geological Conference of Payam Noor University(PNU)
Publishing Year : 1389

Abstract :

Chah-Salar pluton is located in S-Sw of Neishabour. Based on the field observations, petrography and geochemical classification, this pluton include an approximately compositional range from diorite, granodiorite to granite with Granular, myrmekitic and graphic textures. The trends of the major, trace and rare earth elements in the variation diagrams of this rocks indicate a continuous compositional range between them. Variation diagram trends of major and trace elements indicate a contineouscompositional range and a comagmatic origin for these rocks. Variation diagram trends of compatibleincompatible elements indicates the important role of fractional crystallization in the genesis of these rocks. All samples are metaluminous and calc-alkaline nature. High values of Rb,Sr,K,U,Th,Zr and Ba
and high ratios of K2O/Rb and FeO/MgO indicate the similarity of the rocks of this intrusion with the rocks of continental margin magmatic arc intrusions. Discrimination diagrams of tectonic setting indicate that granitoidic pluton of Chah-Salar is belong to volcanic arc and Syn-collision graniotiods (VAG and Syn-Colg). Detailed investigations of field geology, Petrography and geochemical characteristics indicate the magma that formed this pluton is resulted from partial melting of subducted Oceanic slab with amphibolitic composition, and then evolved by crystal fractionation and magma contamination.

Subject List : Granitoeid