RECONSTRUCTION OF THE THERMAL HISTORY OF METAMORPHIC ROCKS FROM THE EXCHANGE-DIFFUSION ZONING OF MINERALS
V.N. Korolyuk, G.G. Lepezin, and A.V. Korsakov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Chemical zoning, exchange-diffusion reactions, partition coefficients, diffusion, rates of burial and exhumation, duration
Pages: 464-475
Abstract
We mathematically justified a model for the formation of chemical zoning in minerals involved in exchange-diffusion reactions of the type FeOl + MgOpx = FeOpx + MgOl. We constructed FeO concentration profiles for garnet crystals of different sizes, using a garnet-pyroxene thermobarometer and diffusivities, and estimated the rates of burial and exhumation of low-temperature granulite facies rocks and eclogites.
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