Abstract
A variety of techniques are available for calculating gains and losses of elements during metasomatism from the chemical analyses of the respective rocks. The general metasomatic equation derived by Gresens (1967) supersedes all others because of its general applicability to all conditions of metasomatism and through its introduction of corrections for differences between specific gravities of samples and for volume changes during alteration. An application of this computational procedure is demonstrated using an example of alkaline biotite-microcline-oligoclase gneiss formed by the interaction of schistose metagabbro and nepheline syenite (litch-fieldite) pegmatite at Dønnesfjord, Sørøy, northern Norway.
Two genetic models, one of constant volume nephelinization and one of magmatic infiltration, are compared. A technique for recognizing elements which are neither added nor removed during alteration is presented which allows the volume increase implicit in the infiltration model to be calculated. It is concluded that the geological relationships in the outcrop and the geochemical characteristics of the samples are best represented by a predominantly infiltrational model modified by diffusional movement of some elements.
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Appleyard, E.C. Mass balance computations in metasomatism: Metagabbro/nepheline syenite pegmatite interaction in northern Norway. Contr. Mineral. and Petrol. 73, 131–144 (1980). https://doi.org/10.1007/BF00371388
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DOI: https://doi.org/10.1007/BF00371388