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- W1990033597 abstract "The Western Gneiss Region of Norway contains relics of eclogite and high-pressure granulite that have been extensively overprinted by amphibolite-facies assemblages. A meta-anorthosite from Seljeneset. Nordfjord, contains fine-grained margarite+quartz+plagioclase±muscovite clots set in a zoisite+quartz+plagioclase±clinozoisite matrix. In some clots relict kyanite is preserved. Equilibria modeled in the CASH system indicate a retrograde P-T path that begins in the kyanite+zoisite field (P>8.2 kbar), passes through reaction (1), kyanite+zoisite+quartz⇌anorthite+H2O, between 610°C and about 800°C, and finally through reaction (2), kyanite+anorthite+H2O⇌margarite+quartz. The sodic composition of plagioclase in reaction (1) suggests that pressures in excess of 15–17 kbar (at 750–800°C) may have been experienced during Silurian eclogite-facies metamorphism. The simplified CASH reaction (2) occurs between invariant points at 4.3 kbar,520°C and 8.2 kbar,610°C, but polyvariance, due to variable Na solid solution, broadens the reaction into a band about 150°C wide. Cooling through 500°C occurred about 410 Ma ago. This study provides the first well-defined P-T path for Caledonian retrograde metamorphism at amphibolite-facies conditions." @default.
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- W1990033597 date "1988-02-01" @default.
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- W1990033597 title "Petrology of a margarite-bearing meta-anorthosite from Seljeneset, Nordfjord, western Norway: Implications for the P-T history of the Western Gneiss Region during Caledonian uplift" @default.
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