Abstract
Metasomatized ultramafic rocks from the 3800 Ma Isua supracrustal belt have been preferentially enriched in calcium, aluminium and silica, but show no or only little addition of potassium and rubidium. This unusual geochemical response to fluid infiltration can be explained in the light of a low buffered activity of aqueous silica during progressive silicification of the metasomatized units. Thermodynamic analysis shows that the selective element mobility was controlled by the stabilities of mineral assemblages in the ultramafic rocks during alteration.
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© 1989 Kluwer Academic Publishers
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Rosing, M.T. (1989). Metasomatic Alteration of Ultramafic Rocks. In: Bridgwater, D. (eds) Fluid Movements — Element Transport and the Composition of the Deep Crust. NATO ASI Series, vol 281. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0991-5_17
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DOI: https://doi.org/10.1007/978-94-009-0991-5_17
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