Abstract
The crystallization of a hydrous melt in the system K2SiO3—SiO2—H2O is studied in detail to determine what are the external factors exerting the greatest influence over the character of the final crystallization product. These are found to be (a) the nature of the stresses present in the crustal horizon at which crystallization takes place and, (b) the effective pressure of the water in the pores of the surrounding rock, a pressure which is determined by the potential rate of escape of vapour from the magma as well as by the gas pressure of the water itself. Various types of environment are considered and the products of consolidation of an ideal magma of this system compared for the various cases. The probable mode of assimilation of a xenolith composed of one of the solid phases of the system in such an ideal magma is also investigated.
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