Аннотация:Abstract. We microprobed the compositions and chemical heterogeneities of garnets and clinopyroxenes, the most important rock-forming minerals of eclogites of the Maksyutov complex. Using the Grt-Cpx maximum-T geothermometer (Powell, 1985) and the Pl-Cpx-Qz minimum-P geobarometer (Perchuk, 1992) allowed us to assess the physico-chemical metamorphic evolution of the complex, and to identify several stages of its progressive and retrograde development. Maximum temperatures and minimum pressures for Grt + Cpx + Pl + Qz equilibrium (T ~ 805-910 °C, P ~ 2.5-3.5 GPa), recorded in the compositions of coexisting phases indicate HP-UHP conditions of formation of the complex, as well as its potential for a stage of stability in the diamond P-T field. Subsequent retrograde and secondary prograde metamorphism occurred under lower grade conditions typical for the blueschist (T ~ 450-700 °C, P ~ 1.2-1.7 GPa) and greenschist (T ~ 380-470 °C, P ~ 0.7-1.3 GPa) facies.
