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1 Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA
Inverse calculations reveal the three-dimensional geometry of time-integrated fluid flux over a 120 km2 area during peak Barrovian regional metamorphism in southeastern Vermont. Prograde changes in whole-rock CO2, 18O, and 13C 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 
0 to 3·105 mol fluid/cm2 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 3.4·104 mol fluid/cm2 rock. The average flux vector trends 45° to the southwest and points upward at 36° from the present horizontal, parallel to formation boundaries on a regional scale. Fluids in the terrain carried 3·103 mol CO2/cm2 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.
Key Words: metamorphism • fluid flow • inverse problem • CO2 • 
18O • 13C
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