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• W2046751981 endingPage "249" @default.
• W2046751981 startingPage "230" @default.
• W2046751981 abstract "In the Münchberg Massif in the Variscan foldbelt of southern Germany two varieties of eclogite are known which are intercalated with amphibolite-facies meta-igneous and meta-sedimentary rocks: a dark kyanite-free and a lighter colored kyanite-bearing type. Kyanite-free eclogites, which are discussed here, have a major and trace element composition which suggests derivation from ocean-floor basalts with melt to cumulate compositions. Internal SmNd isochrons (clinopyroxene-amphibole-garnet) and one RbSr isochron (clinopyroxene-amphibole-mica) yield eclogitization ages in the range of 380 to 395 Ma. Thus, the age of eclogitization is only marginally higher ( < 15 Ma) than the age of amphibolite-facies metamorphism in the Münchberg Massif as derived from KAr ages of amphiboles and micas from metasediments and meta-igneous rocks. A seven point whole-rock SmNd isochron for one eclogite body results in an age of480 ± 23Ma with an initialεNd of8.7 ± 0.6 and is likely to record the age of igneous formation of the eclogite protoliths. Sr isotopic compositions back-calculated to that time are anomalously high and variable if compared to Nd isotopes. This can be explained by alteration with an aqueous or fluid phase with high87Sr86Sr, most likely seawater, either during igneous formation in an oceanic rift environment or subduction-related eclogitization. In addition, some eclogites show a marked enrichment of incompatible, immobile elements and plot far below the whole-rock SmNd isochron. These features are ascribed to the presence of an evolved crustal component, probably acquired during extrusion of the basaltic protoliths by mixing with country-rock gneisses." @default.
• W2046751981 created "2016-06-24" @default.
• W2046751981 creator A5032266173 @default.
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• W2046751981 date "1990-08-01" @default.
• W2046751981 modified "2023-10-06" @default.
• W2046751981 title "Geochemistry and evolution of MORB-type eclogites from the Münchberg Massif, southern Germany" @default.
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• W2046751981 doi "https://doi.org/10.1016/0012-821x(90)90113-c" @default.
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