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- W2078441144 abstract "A Sm-Nd mineral isochron of 1932 ± 45 Ma on a Kiruna greenstone is defined by greenschist facies metamorphic minerals, apparently older than the regional Svecokarelian metamorphism (< 1880 Ma). However, this age agrees within error with U-Pb zircon ages of 1909 ± 1617 Ma on quartz-bearing prophyries which overlie but are, in part, intercalated with basic volcanics. If these basic volcanics, following previous studies, are considered to be contemporary with the Kiruna greenstones, the present data suggest that eruption of both basic and acid volcanics and associated hydrothermal metamorphism took place over a short time interval close to 1.9 Ga. The greenstone sample is depleted in light rare-earths and has high initial 145Nd/144Nd indicating a source in which such depletion has existed for a long time. In contrast, an albite diabase sample with a somewhat younger mineral age (1.80 ± 0.08 Ga) is light rare earth enriched and has a correspondingly low initial Nd isotopic composition." @default.
- W2078441144 created "2016-06-24" @default.
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- W2078441144 date "1984-10-01" @default.
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- W2078441144 title "Sm-Nd and U-Pb dating of Early Proterozoic mafic-felsic volcanism in Northernmost Sweden" @default.
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- W2078441144 doi "https://doi.org/10.1016/0301-9268(84)90015-9" @default.
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