Pb isotope geochemistry of the Fen carbonatite complex, S.E. Norway: age and petrogenetic implications

Tom Andersen*, Paul N. Taylor

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)

    Abstract

    Eighteen samples of carbonatites and associated silicate rocks from the Fen complex, southeast Norway, define a whole-rock Pb/Pb isochron (MSWD 3.63) with an age of 539 ± 14 Ma and a single-stage model μ value of 8.15. The samples show an extreme range of 206Pb/204Pb from 18.9 to 226, which correlates with the abundance of apatite in the rocks. The isochron plots above the Pb isotope growth curve for depleted mantle, but a composite of local crustal rocks has a composition which coincides with the Fen isochron. These features are interpreted as evidence of significant crustal contamination taking place during differentiation of carbonatite magma in the middle to shallow crust.

    Original languageEnglish
    Pages (from-to)209-215
    Number of pages7
    JournalGeochimica et Cosmochimica Acta
    Volume52
    Issue number1
    DOIs
    Publication statusPublished - 1988

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