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

C. J. Adams; H. J. Campbell; W. L. Griffin

doi:10.1016/j.chemgeo.2005.03.007

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 journal › Article › peer-review

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 language	English
Pages (from-to)	67-82
Number of pages	16
Journal	Chemical Geology
Volume	220
Issue number	1-2
DOIs	https://doi.org/10.1016/j.chemgeo.2005.03.007
Publication status	Published - 12 Jul 2005

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title = "Isotopic microanalysis of seawater strontium in biogenic calcite to assess subsequent rehomogenisation during metamorphism",

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.",

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AU - Adams, C. J.

AU - Campbell, H. J.

AU - Griffin, W. L.

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AB - 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.

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

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