Deformation thermometry and vorticity analyses of Beshneh metamorphic complex, north of Neyriz, Sanandj-Sirjan metamorphic belt, Iran.

سامانی, بابک

doi:10.22034/kjes.2026.138312.1014

Deformation thermometry and vorticity analyses of Beshneh metamorphic complex, north of Neyriz, Sanandj-Sirjan metamorphic belt, Iran.

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسنده

بابک سامانی

10.22034/kjes.2026.138312.1014

چکیده

This research focuses on the analysis of deformation flow and metamorphic conditions in quartz-rich mylonitic schists within the Beshneh deformed zone, located north of Neyriz in the Sanandaj-Sirjan metamorphic belt. Quartz c-axis preferred orientations were used as a robust micro-thermometer to constrain metamorphic temperature and pressure conditions. Based on the angular relationships between the recrystallized quartz oblique foliation (δ), and the angle β between the mylonitic foliation and the shear plane the kinematic vorticity values were calculated from 0.56 to 0.9. Stereographic analysis of quartz c-axis patterns reveals non-coaxial deformation flow with dextral shear sense in the deformed zone. The quartz c-axis opening angle values were determined to range from 45° to 62°. Using the quartz c-axis opening angles, metamorphic temperatures were determined to range between 358±50 and 476±50 °C, within the greenschist facies up to the lower boundary of the amphibolite facies, while metamorphic pressures were constrained to 3–4.5 kbar.

کلیدواژه‌ها

Quartz c-axis

Dynamic recrystallization

Kinematic vorticity

Neyriz

Sanandaj-Sirjan metamorphic belt

موضوعات