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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