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Heat effects and concentration of magmatic melt impurities during the intrusive formation
Abstract. Melt crystallization in an intrusive is a temporal exothermic process occurring in a non-equilibrium system. The heat liberated in the crystallizing system and the heat removed into the environment are interrelated. Their relation sets the level of the positive feed-back that is determined by the heat accelerating the crystallization process through the temperature variations. In the context of non-equilibrium thermodynamics principles, crystallization of a magmatic melt differs from that occurring by equilibrium scheme. The process periodicity sets the fluctuation regimes for crystallization velocity and temperature. The conditions of heat liberation play the part of a fluctuation amplifier. In this case the heat outflow velocity will control the crystallization velocity. The higher is the heat outflow velocity, the more often such fluctuations repeat. The proper conditions for creating periodic chemical heterogeneity in the front crystallization area are determined by the relation of two velocities: the velocity of melt crystallization and that of heat outflow into the environment through the enclosing rocks. So the impurities' concentration before the crystallization front as a rhythmic repetition of some minerals (including PGE) should last for a long time. In certain places of intrusive volumes the impurities should be trapped according to the heat outflow conditions and the kind of the heat conductivity of the enclosing rocks.
Printed reference: Karzhavin V.K. Heat effects and concentration of magmatic melt impurities during the intrusive formation // Vestnik of MSTU. 2002. V. 5, No 1. P. -.
Electronic reference: Karzhavin V.K. Heat effects and concentration of magmatic melt impurities during the intrusive formation // Vestnik of MSTU. 2002. V. 5, No 1. P. -. URL: http://vestnik.mstu.edu.ru/v05_1_n11/articles/15_karzh.zip.
