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Phase relations in metabasites and pressure-temperature conditions at the prehnite-pumpellyite to greenschist facies transition, Flin Flon, Manitoba Canada

By
Scott G. Digel
Scott G. Digel
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T. M. Gordon
T. M. Gordon
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Published:
January 01, 1995
Metamorphic mineral assemblages in metamorphosed mafic volcanic rocks located on and straddling the prehnite (Prh)-pumpellyite (Pmp) to greenschist facies transition in the Flin Flon, Manitoba, area were studied using singular value decomposition. Mass balances obtained for a sample from the transition zone are identical to previously deduced equilibria in the system Na2O-CaO-MgO-Al2O3-SiO2-H2O and we cannot reject the hypothesis that they equilibrated under conditions of invariant (in this model system) equilibrium. Mass balances obtained between two samples straddling the isograd are in accord with petrological observations across the transition and suggest that it can be modeled by three coincident isograds approximated by:  
Prh - out , Act - in : Prh + Chl + Ab = Act + Ep + H 2 O ,
and  
Pmp - out , Act - in : Prh + Chl + Ab = Act + Ep + H 2 O ,
where Act is actinolite; Chl is chlorite, Ab is albite, and Ep is epidote. Thermochemical data from various sources cited herein were used to estimate metamorphic conditions at the transition at 2.8–3.4 kbar, 280–290 °C.
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Contents

GSA Special Papers

Low-Grade Metamorphism of Mafic Rocks

Peter Schiffman
Peter Schiffman
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Howard W. Day
Howard W. Day
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Geological Society of America
Volume
296
ISBN print:
9780813722962
Publication date:
January 01, 1995

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