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Fluid and carbon flux estimation of regional metamorphic fluid flow in Glen Esk, SE Scottish Highlands: The role of hydrodynamic dispersion for broadening of an isotopic front
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Number of Authors: 22018 (English)In: American Journal of Science, ISSN 0002-9599, E-ISSN 1945-452X, Vol. 318, no 4, p. 435-457Article in journal (Refereed) Published
Abstract [en]

During metamorphism, large quantities of fluids are mobilized and transported through the crust. Such fluids may interact with surrounding rock and serve as a medium for chemical transport. In this study, we use coupled carbonation and oxygen isotope fronts to estimate fluid and carbon fluxes for metamorphic fluid flow in vein pathways in the Dalradian metasediments that crop out in Glen Esk, SE Scottish Highlands. Comparison of wall rock and vein oxygen Isotope ratios indicate that the Barrovian sequence in Glen Esk was infiltrated by at least two separate fluid flow events, where fluid flow from the North Esk Fault overprints an earlier fluid flow event, for which the syn-metamorphic magmatic intrusions north of Glen Esk are a probable fluid source. Advection is the dominating mode of fluid transportation in veins. By advection-dispersion and advection-diffusion modeling, we estimate a time-averaged fluid flux of 0.0005 to 0.0135 m(3).m(-2).yr(-1) and a carbon flux of 0.04 to 0.71 mol C.m(-2).yr(-1) for fluid flow from the North Esk fault into the Dalradian metasediments. The duration of this fluid flow event is estimated to between 11 and 230 kyr. Our results also indicate that hydrodynamic dispersion was the main reason for broadening of the oxygen isotope front.

Place, publisher, year, edition, pages
2018. Vol. 318, no 4, p. 435-457
Keywords [en]
Metamorphic fluid flow, metamorphic fluid and carbon flux, duration of metamorphic fluid flow, advection-dispersion modeling, advection-diffusion modeling
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-157820DOI: 10.2475/04.2018.03ISI: 000433380600003OAI: oai:DiVA.org:su-157820DiVA, id: diva2:1227915
Available from: 2018-06-27 Created: 2018-06-27 Last updated: 2018-06-27Bibliographically approved

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Lewerentz, AlexanderSkelton, Alasdair D. L.
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