Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Origin of Bon-Dono Gneisses- The East of Bavanat-Fars Province

Authors
1 Department of Geology, Islamic Azad University, Sciences and Research Unit of Tehran
2 Research Institute of Earth Sciences, Geological Survey of Iran, Tehran, Iran
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.
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