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- W1997091312 abstract "Abstract The Turtle Bay Suite comprises an assemblage of mafic, two-pyroxene granulites (noritic and monzonoritic) and interlayered felsic granulites, which are exposed in the southern part of the ∼1 Ga Natal Metamorphic Province. Whereas monzonoritic and enderbitic rocks with over 70 % modal plagioclase occur, no true anorthosites are represented, in contrast to other Mid- to Late Proterozoic high grade terranes. The suite is geochemically sub-alkaline. The mafic rocks resemble continental tholeiites, whereas the felsic rocks exhibit a more transitional, calc-alkaline character. Despite the apparent systematic variation of many “immobile” elements throughout the suite, trace element ratios and REE patterns suggest that the mafic and felsic rocks were derived from two genetically unrelated sources. Basic feldspathic monzonorites can be modelled as plagioclaserich cumulates from mafic magmas, but these are geochemically distinct from the highly fractionated enderbitic rocks. It is concluded, by analogy with other Proterozoic norite-mangerite-charnockite suites, that the mafic rocks crystallised from mantle-derived magmas which were emplaced into the granulite facies lower crust. This initiated limited partial melting of the crustal rocks to produce anhydrous, tonalitic melts from which enderbites and highly fractionated charnockites evolved. Thermobarometry from compositions of orthopyroxene and clinopyroxene pairs and co-existing olivine-orthopyroxene-clinopyroxene-quartz suggest that the Turtle Bay Suite was metamorphosed under granulite grade conditions of ∼850°C and ∼6 kb." @default.
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- W1997091312 date "1992-08-01" @default.
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- W1997091312 title "The petrology of the Turtle Bay Suite: a mafic-felsic granulite association from southern Natal, South Africa" @default.
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- W1997091312 doi "https://doi.org/10.1016/0899-5362(92)90068-n" @default.
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