Origin of Bon-Dono Gneisses- The East of Bavanat-Fars Province
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.
Language:
Persian
Published:
Geosciences Scientific Quarterly Journal, Volume:16 Issue:61, 2007
Page:
160
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