Isotopic microanalysis of seawater strontium in biogenic calcite to assess subsequent rehomogenisation during metamorphism

C. J. Adams, H. J. Campbell*, W. L. Griffin

*Corresponding author for this work

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Precise LAM-MC-ICPMS in situ microanalyses of 87Sr/ 86Sr ratios in biogenic calcite of the bivalve 'Atomodesma' are reported for 14 horizons in low-grade metasediments of late Early Permian to late Late Permian age in South Island, New Zealand. 'Atomodesma' shells (and associated skeletal echinoderm calcite) in zeolite and possibly to lower prehnite-pumpellyite mineral facies material yield isotopic data that are interpreted as primary seawater 87Sr/86Sr values. Data for higher metamorphic grade (probable upper prehnite-pumpellyite to lawsonite-albite facies) samples consistently show evidence of Sr isotopic homogenisation between 'Atomodesma' calcite and host matrix and thus seawater 87Sr/ 86Sr values are not retained in shell debris under any circumstances.

    Original languageEnglish
    Pages (from-to)67-82
    Number of pages16
    JournalChemical Geology
    Volume220
    Issue number1-2
    DOIs
    Publication statusPublished - 12 Jul 2005

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