Writers : Noon Khankahdani.K , Sabzehei.M & Vosooghi Abedini.M
Refference : Geosciences Scientific Quarterly Journal,No.:61,P.:160
Publishing Year : 1385

Abstract :
Bon-Dono Gneisses are exposed in the core of Tutak anticline, 200 km NE of Shiraz. Tutak metamorphic complex or the host rock of these gneisses is part of Sanandaj- Sirjan Metamorphic Belt. Field studies have shown that: (1) the age of protoplast of Tutak complex is Upper to Lower Paleozoic. It is comprised of various micaschists, amphibolites, marbles and greenschist. They are metamorphosed in a pre-Upper Jurassic metamorphic event. (2) Tutak complex had been invaded later by a granitic body. Previous regional metamorphic rocks had been subjected to a contact metamorphism resulted from this intrusive magma. (3) This granitic body had been subjected to mylonitization in a shear zone and converted to the so-called Bon-Dono Gneiss. Field, petrographic and geochemical studies all indicate magmatic nature of original protolith of so- called Bon-Dono gneisses.
Subject List : Gneisse