2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University pmi-6889 https://pmi.spmi.ru/pmi/article/view/6889 Минералогия и петрография Mineralogy and petrography Morphometry of aggregates and modeling of phase transition kinetics under metamorphism Морфометрия агрегатов и моделирование кинетики фазовых превращений при метаморфизме Gulbin Yu. L. Гульбин Ю. Л. Gulbin Yu. L. gulbin@spmi.ru Санкт-Петербургский государственный горный институт (технический университет) (Россия) Saint-Petersburg State Mining Institute (Technical University) (Russia) 11 12 2009 2009 183 174 180 17 10 2008 07 12 2008 11 12 2009 © 2009 Ю. Л. Гульбин © 2009 Yu. L. Gulbin 2009 Ю. Л. Гульбин Yu. L. Gulbin Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0) This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://pmi.spmi.ru/pmi/article/view/6889

Рассмотрены некоторые общие закономерности, связывающие структуру метаморфических пород и механизмы фазовых реакций. К числу подобных закономерностей следует отнести влияние кинетики нуклеации и роста кристаллических зародышей на гранулометрические характеристики агрегатов. Дан краткий обзор существующих моделей генезиса гранулометрических распределений, на примере гранатов метапелитов проанализированы кинетические зависимости и факторы метаморфической кристаллизации, включая явление лавинообразной нуклеации зародышей при конечном перегреве пород и рост порфиробластов в условиях диффузионного лимита. Продемонстрированы новые подходы к моделированию природных гранулометрических кривых.

The paper discusses some general relations between the structure of metamorphic rocks and mechanisms of phase reactions. Among these relations is the influence of nucleation and growth of kinetics on the crystal size distribution. A brief overview is made of theoretical models which have been proposed to explain granulometric properties of rocks, and kinetic laws and factors on the metamorphic crystallization are considered by the example of metapelitic garnets, including the phenomenon of avalanche nucleation at finite overheating as well as the growth of porphyroblasts under diffusion-limited conditions. As a result, a new approach to modeling of native granulometric curves is presented.

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