Neodymium isotope systematics of the mantle beneath the Baltic shield

evidence for depleted mantle evolution since the Archaean

T. Andersen*, B. Sundvoll

*Corresponding author for this work

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    More than 300 published and unpublished Nd isotopic analyses of mantle derived rocks from the Baltic shield have been compiled. The rocks range in age from Archaean to Phanerozoic. Within any given age-interval, the mantle derived rocks range in ε{lunate}Nd(t) from depleted mantle values at or above the growth curves of the global depleted mantle reservoirs of DePaolo (1981) and DePaolo et al. (1991) to negative values. Initial neodymium isotopic compositions below the De Paolo curve are best explained by interaction between depleted mantle derived magmas and local crustal contaminants. The data now available lend no support to the existence of isolated, less depleted or undepleted mantle domains beneath the Baltic Shield, as was suggested by Mearns et al. (1986) and Valbracht (1991a, b).

    Original languageEnglish
    Pages (from-to)235-243
    Number of pages9
    JournalLithos
    Volume35
    Issue number3-4
    DOIs
    Publication statusPublished - 1995

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