A stochastic model for the crystallization and textural analysis of a fine grained granitic stock near Meech Lake, Gatineau Park, Quebec
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Abstract
A stock of fine grained potassic granite (Meech Lake aplite) has been investigated using a stochastic model for 'ideal' granite developed at the Laboratory of Mathematical Geology in Leningrad. From observations of the contacts of the stock with its country rocks, it can be assumed that the stock originated from a melt and that crystallization took place in a magma chamber. A hypothesis on the absence of significant metasomatic alteration in the stock was tested and confirmed through the investigation of about 140 specimens collected from the stock. This conclusion does not contradict traditional petrographic analysis. Because the stochastic-process model of a magmatic, relatively unaltered, ideal granite fits the observations well, the parameters of this model were investigated in detail. These parameters can be indicative of the viscosity of the magma. The pattern of parameter values for the stock shows that different parts of the stock were generated from the same magma but with differences in viscosity and in content of volatile components.
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