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Blue amphibole-albite-chlorite assemblages from Fuscaldo (S Italy) and the role of glaucophane in metamorphism

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Abstract

The Fuscaldo assemblages show that in metabasites suitable for the production of glaucophane at higher pressures, amphibole poor(er) in Gl-molecule + albite + Al-rich chlorite is formed at lower pressure. Blue amphibole formed together with albite, chlorite and a Ca-silicate appears to have a fixed content of the Gl-molecule and of Ca2+, apart from the Fe2+/ R2+ ratio, which varies with host rock chemistry. The constant Gl-content indicates attainment of equilibrium, and is a function of T and especially P, so it may be used as a geobarometer. Glaucophane generally forms at the cost of albite+chlorite. In a P-T diagram the reaction is probably situated somewhat below the reaction albite→jadeite+quartz, and has a smaller slope than the latter. The concomitant high-pressure character of glaucophane justifies reintroduction of Eskola's glaucophane-schist facies, of which glaucophane is critical.

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Authors and Affiliations

  1. Geol. Mijnb. Dienst, Kleine Waterstraat 2-6, Paramaribo, Suriname (South Am.)

    Emond W. F. de Roever

  2. Geologisches Instituut, Nieuwe Prinsengracht 130, Amsterdam, Holland

    Frank F. Beunk

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  1. Emond W. F. de Roever
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  2. Frank F. Beunk
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de Roever, E.W.F., Beunk, F.F. Blue amphibole-albite-chlorite assemblages from Fuscaldo (S Italy) and the role of glaucophane in metamorphism. Contrib. Mineral. Petrol. 58, 221–234 (1976). https://doi.org/10.1007/BF00402353

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