Abstract
The kinetics of zoned garnet porphyroblast growth is exemplified in a sample of garnet-staurolite-biotite schist from the northern Ladoga region. The diffusion-controlled porphyroblast growth was accompanied by a decrease in the kinetic coefficient during phase reactions. Even at insignificant (1–2°C) thermal overstepping, the leading role of diffusion as a factor that controls kinetics of porphyroblast growth in medium-grade metapelites is consistent with the parameters of metamorphic crystallization: T = 500–650°C, t = 1 Ma; D appA1 = 10−14 cm2/s, L = 0.2–0.6 cm, r = 1–3 mm, ΔC Al = 1.5 × 10−4–1.5 × 10−3 mol/cm3.
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Original Russian Text © Yu.L. Gulbin, 2012, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2012, No. 6, pp. 1–17.
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Gulbin, Y.L. Compositional zoning in garnet and kinetics of metamorphic crystallization. Geol. Ore Deposits 55, 613–624 (2013). https://doi.org/10.1134/S1075701513080047
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DOI: https://doi.org/10.1134/S1075701513080047