The Lower Greenschist Facies in the Scottish Highlands
作者： Malcolm McNamara
DOI: 10.1080/11035896509448918
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摘要: Abstract The characteristic mineral assemblage in the lowest grade Dalradian slates and phyllites quartz + albite phengite chlorite calcite dolomite anatase. New analyses of coexisting minerals include muscovite, phengite, chlorite, biotite, chloritoid. Muscovite-paragonite relationships zone rocks are examined. claim recent workers that phengites change towards a more muscovitic composition with increase metamorphic is not sustained; range believed to rise pressure temperature, ratio Fe+3 : Fe+2 also increases. Greenschist facies chlorites usually ripidolites, those from quartz-albite-phengite-chlorite schists richer aluminium than actinolite schists, poorer chloritoid schists. Reactions type carbonates = products CO2 H2O suggested, which epidote, form c...
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