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Three-dimensional geometry of metamorphic fluid flow during Barrovian regional metamorphism from an inversion of combined petrologic and stable isotopic data



Three-dimensional geometry of metamorphic fluid flow during Barrovian regional metamorphism from an inversion of combined petrologic and stable isotopic data



Geology (Boulder) 30(7): 639-642



Inverse calculations reveal the three-dimensional geometry of time-integrated fluid flux over a 120 km (super 2) area during peak Barrovian regional metamorphism in southeastern Vermont. Prograde changes in whole-rock CO (sub 2) , (super 18) O, and (super 13) C and calculated fluid compositions at the peak of metamorphism were inverted assuming tracer mass balance to obtain the time-integrated fluid flux in three dimensions. Peak metamorphic fluid flow was spatially nonuniform with flux magnitudes ranging from approximately 0 to 3.10 (super 5) mol fluid/cm (super 2) rock and flux directions ranging from vertical (upward and downward) to horizontal. Averaged over the entire study area, the magnitude of the time-integrated metamorphic fluid flux vector is approximately 3.4.10 (super 4) mol fluid/cm (super 2) rock. The average flux vector trends 45 degrees to the southwest and points upward at 36 degrees from the present horizontal, parallel to formation boundaries on a regional scale. Fluids in the terrain carried approximately 3.10 (super 3) mol CO (sub 2) /cm (super 2) rock toward Earth's surface during the peak of metamorphism. Results suggest that local cross-layer transport processes are secondary to terrain-scale metamorphic fluid flow in driving prograde decarbonation reactions. Regional structure exerts a first-order control on the gross geometry of peak metamorphic fluid flow.

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Accession: 020490901

Download citation: RISBibTeXText

DOI: 10.1130/0091-7613(2002)030<0639:tdgomf>2.0.co;2


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