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deuteric reaction

deuteric reaction The ‘simmering’ of an igneous rock in its own ‘juices’. After the last drop of silicate melt has crystallized and the rock is, in effect, solid, residual water-rich vapour, concentrated by the crystallization of a large proportion of non-water-bearing minerals, can permeate along crystal boundaries and through crystal fractures and react with the primary minerals. Reaction of the low-temperature vapour with high-temperature magmatic minerals (see MAGMA) is termed ‘deuteric alteration’.

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