Abstract
Samples located near the Oregon Dome anorthosite massif in the south-central Adirondack Mountains, New York contain the fluid-buffering mineral assemblages: amphibole + clinopyroxene + orthopyroxene + quartz or biotite + quartz + orthopyroxene + K-feldspar. These rocks were metamorphosed under granulite-facies conditions (T=725°–750°C, P=7.5 kbar) during the Grenville orogeny. The Mg-rich nature of amphiboles, micas, and pyroxenes allow accurate calculation of water activities because corrections for the effects of solid solution are relatively small. The activity of water was low during the peak of granulite-facies metamorphism, with αH2O≈0.15±0.14. Wollastonite occurrences indicate that the αCO2 was low (<0.3) in nearby rocks, demonstrating that large quantities of CO2 did not infiltrate in a pervasive manner. The combination of low αH2O with low αCO2 is consistent with the hypothesis that magmatic processes were dominant, generating dry, fluid-absent conditions.
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Abbreviations
- fi :
-
Fugacity of species i in a fluid
- Xi :
-
mole fraction of component i in a phase
- T :
-
temperature
- P :
-
lithostatic pressure
- P F :
-
fluid pressure
- α xi :
-
activity of component i phase X
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Lamb, W.M., Valley, J.W. Granulite facies amphibole and biotite equilibria, and calculated peak-metamorphic water activities. Contr. Mineral. and Petrol. 100, 349–360 (1988). https://doi.org/10.1007/BF00379744
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DOI: https://doi.org/10.1007/BF00379744