Metamorphic, sedimentary and igneous rocks of Precambrian to recent age outcropped in the south of Mahallat. The metamorphic rocks of the study area form the western part of the Muteh-Golpaygan metamorphic complex, situated in the central part of the Sanandaj-Sirjan Zon
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Metamorphic, sedimentary and igneous rocks of Precambrian to recent age outcropped in the south of Mahallat. The metamorphic rocks of the study area form the western part of the Muteh-Golpaygan metamorphic complex, situated in the central part of the Sanandaj-Sirjan Zone. These rocks are separated from younger non-metamorphic rocks by normal faults. The main lithology is schist, marble, gneiss and amphibolite. These rocks confirm three successive and prograde deformations as well as three stages of metamorphism. The first stage of deformation created isoclinal and intrafolial folds, first generation boudins and first generation foliation in amphibolite to greenschist facieses. The second stage of deformation is identified by formation of second generation folds, second generation boudins and mylonitic foliation in a greenschist facies. Finally, the third stage of deformation occurred in ductile-brittle condition and is associated with decrease of deformation. The contact metamorphism is the result of the several intrusive rocks that were identified by formation of the metamorphic aureoles, hornfelse or scarns, and in microscopic scale by recrystallization of new minerals or obliteration of former structures.
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