نوع مقاله : مقاله پژوهشی
نویسندگان
گروه زمینشناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The studied area is located on the border of Alborz and Central Iran structural zones in North-East of Iran. At the outcrops,several strata units of granite and volcanic rocks (about 630-680 m.a) along with the structural elongation of northwest-southeast are present. The studied microstructures are in a narrow range along the Fariman-Torbat-e Jam shear zone, which seems to be the result of structural functions. Brittle and ductile structures and microstructures in Proterozoic intrusive and volcanic rocks of the Fariman-Torbat-e Jam orogenic belt and various types of metamorphic behaviours have been investigated in detail in this research. The results show the diverse performance of deformation mechanisms, especially recrystallization of the bulge type and recrystallization with grain boundary migration (BLG, GBM). According to the detection of malleable structures in the deformation zone of the Fariman-Torbat-e Jam, brittle density increased with irregular intervals, moving away from the centre of the shear zone, which indicates the characteristics of the core and cover of the mentioned brittle zone. Various microcrystalline structures, especially microfractures and microcracks, wave quenching of quartz crystals, core and cover structures in porphyroblasts, recrystallization of protrusions and grain boundary migration at high temperatures can be seen in many and varied along the entire length of this deformed shear zone.
کلیدواژهها [English]