Crustal contaminants in the Permian Oslo Rift, South Norway: constraints from Precambrian geochemistry

Tom Andersen*, Trine Lise Knudsen

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    During the late Paleozoic Oslo rifting event, the SW part of the Baltic Shield was penetrated by mantle-derived magmas from a depleted lithospheric or sublithospheric source. Along the way to their final emplacement, these magmas may have interacted with a heterogeneous continental crust, consisting of a mosaic of continental terranes, each with its unique composition and internal crustal history. Information on radiogenic isotope ratios and trace element distributions in the Precambrian terranes surrounding the rift can be used to define characteristic crustal components. These components may be used as endmembers in petrogenetic modelling of the Oslo Rift magmatic system. Based on available data, six endmember components can be identified, and (semi) quantitatively characterized in terms of Sr, Nd and Pb isotopes and selected trace elements. Data on the distribution of rock-types along the rift flanks allow estimates to be made of the relative importance of the components in different parts of the rift. Combining these data with petrological information may allow a realistic understanding of crust-magma interaction in the Oslo Rift magmatic system. (C) 2000 Elsevier Science B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)247-264
    Number of pages18
    JournalLithos
    Volume53
    Issue number3-4
    DOIs
    Publication statusPublished - 2000

    Keywords

    • Baltic shield
    • Continental crust
    • Magma contamination
    • Proterozoic
    • Radiogenic isotopes
    • Trace elements

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