Feldspar and orthopyroxene piezometers constrained using quartz–feldspar and olivine–orthopyroxene mineral pairs from natural mylonites

Differential stress magnitude is a fundamental parameter in the study of geodynamic processes continental lithosphere, and typically estimated quartz- olivine-dominated lithologies using recrystallized grain size piezometers. Here we evaluate piezometric relationships natural mylonites with mineral pairs quartz–feldspar olivine–orthopyroxene, which commonly coexist deformed crustal mantle rocks, respectively. To analyze pairs, measured dynamically sizes both phases that under approximately isoviscous conditions. Using experimentally calibrated piezometers for quartz olivine, develop feldspar orthopyroxene. These new orthopyroxene reasonably predict observed from naturally lithospheric shear zones. Combining our constrained datasets existing experimental orthopyroxene, also derive are consistent wattmeter model observations other studies mylonitic rocks. Our results provide an alternative estimating rocks such as granulites pyroxenites, olivine unsuitable.