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Mass transfer as a function of metamorphic fluid flux
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2007 (English)In: American Geophysical Union Fall Meeting 2007, 2007Conference paper, Published paper (Other (popular science, discussion, etc.))
Abstract [en]

Fluid-rock interaction is an integral part of metamorphism in the crust, and causes significant mass transfer most clearly demonstrated by mineral veins, ore deposits, and alteration fronts that are ubiquitous throughout metamorphic belts. Quantification of major and trace element fluxes during metamorphism and fluid-rock interaction is critical for complete understanding of global element cycles. The SW Highlands of Scotland are an ideal natural laboratory for investigation of major and trace element fluxes during metamorphism. Syn-metamorphic time integrated fluid fluxes within the 6km wide Ardrishaig anticline have been quantified and vary from $<$10m$^{2}$/m$^{3}$ on the limbs of the anticline to $>$300 m$^{2}$/m$^{3}$ in the axial zone (Skelton et al., 1995, J Petrol 36, 563). This study investigates the major and trace element fluxes that occur as a function of the variation in fluid flux within the Ardrishaig anticline. Both depletion and enrichment in chemical elements occurs and the scale of mass transfer increases with increasing fluid flux. Mobile elements include Si, C, K, Na, Sr, As, and Sb, and element mobility varies strongly with lithology. This well-constrained, localized study correlates well with larger regional scale studies (Pitcairn et al., 2006, Econ Geol 101, 1525) where many elements were shown to be locally mobile but very few were shown to have undergone large scale transport.

Place, publisher, year, edition, pages
2007.
Identifiers
URN: urn:nbn:se:su:diva-16020OAI: oai:DiVA.org:su-16020DiVA: diva2:182540
Available from: 2008-12-12 Created: 2008-12-12Bibliographically approved

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