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Jalali N, Shabanian N, Davoudian A, Bendokht M. Textural features indicating brittle-ductile deformation in Tutak mylonitic leucogranite, northeast of Shiraz, Sanandaj-Sirjan Zone. www.ijcm.ir 2024; 32 (4) :759-772
URL: http://ijcm.ir/article-1-1910-en.html
URL: http://ijcm.ir/article-1-1910-en.html
1- Department of Natural Engineering, Faculty of Earth Sciences and Natural Resources, Shahrekord University, Shahrekord, Iran
Abstract: (954 Views)
Kuh-Sefid Tutak igneous-metamorphic complex is a part of the Sanandaj-Sirjan metamorphic zone which includes magmatic rocks (e.g., orthogneiss, meta-granite, amphibolite, marble, and mylonitic leucogranite. The leucogranite consists of quartz, feldspar, plagioclase, biotite, and phengitic muscovite, and minor minerals are tourmaline, amphibole, titanite, rutile, zircon, epidote, clinozoisite, zoisite, allanite, garnet, hematite (Fe-oxide) and chlorite. Deformation evidence includes folding, foliation, and lineation, and petrography evidence, such as kinking structure in plagioclase mineral and dynamic recrystallization microstructure such as bulging, sub grain rotation, and boundary migration. It shows grain and reduction of grain boundary area in quartz mineral as well as microstructures such as flanking, pinning and windows in the leucogranites and in the igneous-metamorphic rocks of the Sanandaj-Sirjan zone. The evidence shows this region has experienced dynamic deformation in the greenschist to amphibolite facies (250 to 700 °C) in brittle-ductile deformation conditions. Fabric evidence usually shows a dextral shear sense.
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