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Flux rates for water and carbon during greenschist facies metamorphism
Stockholm University, Faculty of Science, Department of Geological Sciences.
2011 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 39, no 1, 43-46 p.Article in journal (Refereed) Published
Abstract [en]

The time-averaged flux rate for a CO2-bearing hydrous fluid during greenschist facies regional metamorphism was estimated to be 10–10.2 ± 0.4 m3 m−2 s−1 by combining (1) Peclet numbers obtained by chromatographic analysis of the propagation of reaction fronts in 33 metamorphosed basaltic sills in the southwest Scottish Highlands (UK), (2) empirical diffusion rates for CO2 in water, and (3) calculated time-averaged metamorphic porosities. The latter were calculated using an expression obtained by combining estimated Peclet numbers with empirical porosity-permeability relationships and Darcy's law. This approach yielded a time-averaged metamorphic porosity of 10–2.6 ± 0.2 for greenschist facies conditions. The corresponding time scale for metamorphic fluid flow was 103.6 ± 0.1 yr. By using mineral assemblages to constrain fluid compositions, a time-averaged annual flux rate for carbon of 0.5–7 mol C m−2 yr−1 was calculated. This matches measured emission rates for metamorphic CO2 from orogenic hot springs and exceeds estimated rates of CO2 drawdown by orogenic silicate weathering, suggesting that orogenesis is a source rather than a sink of atmospheric CO2.

Place, publisher, year, edition, pages
2011. Vol. 39, no 1, 43-46 p.
National Category
URN: urn:nbn:se:su:diva-65247DOI: 10.1130/G31328.1OAI: diva2:461840
Available from: 2011-12-05 Created: 2011-12-05 Last updated: 2011-12-13Bibliographically approved

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Skelton, Alasdair
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