Writers : Keshtkar, E.; Ghorbani, M.; Masoodi, F.
Refference : 28th Symposium on Geosciences and the 14th Symposium on Geological Society of Iran
Publishing Year : 1389

Abstract :

The plutonic complex of southwest of Gayen situated east of the Iranian micro- continent is composed of a non-continuous series of granite to diorite, for which Proterozoic time has been specified. Index diagram of the magmatic source, consistently with Rare Earth Elements’ normalization, indicates attributes of S-type granites for this complex. The nature of the southwest Gayen complex is calcalkaline, and from the point of the saturation index is per-aluminous. Enrichment in Ba, Rb and Th elements and also depletion in Nb and Ti in Rare Earth Elements’ distribution pattern from spider diagrams, indicates attributes of sub-duction-related rocks. Also, distinguished and positive anomaly of the elements Rb, Th and Pb and depletion of the elements Ti, Nb, Ta in the spider diagram indicates involvements of the continental crust in the occurrence and evolution of the magma parent of the plutonic rocks studied. Based on the distinction diagrams for tectonic settings of the granitoide rocks, intrusive rocks are of Collision Granites (COLG) and Continental Collision Granitoids (CCG) type, respectively, which probably complex has been formed by orogenic movements of middle Cimerian, probably during Jurassic.

Subject List : plutonism