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Metasomatism Involving Fluids in CO2-H2O-NaCl

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Chemical Transport in Metasomatic Processes

Part of the book series: NATO ASI Series ((ASIC,volume 218))

Abstract

Phase relations in the system, CO2-H2O-NaCl, are used to model metamorphic fluids in carbonate rocks. It is possible that two fluid phases coexist along most temperature-depth paths in metamorphic rocks if the chloride content of the fluid system is adequate. The presence of, two fluid phases is shown to have considerable influence on the evolution of fluid composition in reacting metasomatic systems. An aqueous brine interacting with dehydration, decarbonation, hydrationde-carbonation and dehydration-decarbonation equilibria is considered. Dilution of a one phase fluid describes the process involving dehydration equilibria. Dilution of the brine by CO2 as in the remaining three reaction types drives fluids into a two-phase region of coexisting liquid and vapour. Saturation in NaCl is shown to be possible for systems undergoing hydration-decarbonation reactions. Irreversible reaction is possible in systems undergoing dehydrationde-carbonation. The rate of reaction progress increases in systems that reach saturation with respect to halite. Still greater rates of reaction progress are possible in systems undergoing irreversible reaction.

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Author information

Authors and Affiliations

  1. Institut für Mineralogie und Petrographie, ETH-ZENTRUM, CH-8092, Zürich, Switzerland

    Volkmar Trommsdorff

  2. Ottawa-Carleton Centre for Geoscience Studies, Department of Geology, Carleton University, Ottawa, Canada, K1S 5B6

    George Skippen

Authors
  1. Volkmar Trommsdorff
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  2. George Skippen
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Editor information

Editors and Affiliations

  1. Department of Geology and Geophysics, University of California, Berkeley, California, 94720, USA

    Harold C. Helgeson

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© 1987 D. Reidel Publishing Company

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Trommsdorff, V., Skippen, G. (1987). Metasomatism Involving Fluids in CO2-H2O-NaCl. In: Helgeson, H.C. (eds) Chemical Transport in Metasomatic Processes. NATO ASI Series, vol 218. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4013-0_6

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  • DOI: https://doi.org/10.1007/978-94-009-4013-0_6

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8280-8

  • Online ISBN: 978-94-009-4013-0

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