Abstract
Observations of fluid composition and behaviour at various structural levels in metamorphic terranes have led to an integrated crustal model for metamorphism with H2O>>CO2 fluids and high fluxes at shallow levels and less abundant CO2>>H2O compositions at depth. Anatectic removal of granitic components and H2O from the lower crust accounts for LILE-depleted granulite compositions and CO2-rich inclusions, but not for the abundance of CO2, which many workers have attributed to external (mantle) sources. A crustal-scale, closed-system circulation model is proposed, in which H2O>CO2 fluids released in low temperature devolatilization reactions are pumped downward by volume-reducing anatectic reactions. The fluid is filtered by removal of much of the H2O component in an amphibolite-facies migmatite zone; the remaining CO2-rich portion is pumped down into granulite-facies migmatites where it is trapped as inclusions or absorbed to a limited extent by magmas.
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Percival, J.A. (1989). Melt-Induced Fluid Pumping and the Source of CO2 in Granulites. 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_6
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DOI: https://doi.org/10.1007/978-94-009-0991-5_6
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