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Extreme isotopic heterogeneity in Samoan clinopyroxenes constrains sediment recycling

Author

Listed:
  • Jenna V. Adams

    (University of California Santa Barbara)

  • Matthew G. Jackson

    (University of California Santa Barbara
    University of California Santa Barbara, Department of Earth Science)

  • Frank J. Spera

    (University of California Santa Barbara)

  • Allison A. Price

    (University of California Santa Barbara)

  • Benjamin L. Byerly

    (University of California Santa Barbara
    Thermo Fisher Scientific)

  • Gareth Seward

    (University of California Santa Barbara)

  • John M. Cottle

    (University of California Santa Barbara)

Abstract

Lavas erupted at hotspot volcanoes provide evidence of mantle heterogeneity. Samoan Island lavas with high 87Sr/86Sr (>0.706) typify a mantle source incorporating ancient subducted sediments. To further characterize this source, we target a single high 87Sr/86Sr lava from Savai’i Island, Samoa for detailed analyses of 87Sr/86Sr and 143Nd/144Nd isotopes and major and trace elements on individual magmatic clinopyroxenes. We show the clinopyroxenes exhibit a remarkable range of 87Sr/86Sr—including the highest observed in an oceanic hotspot lava—encompassing ~30% of the oceanic mantle’s total variability. These new isotopic data, data from other Samoan lavas, and magma mixing calculations are consistent with clinopyroxene 87Sr/86Sr variability resulting from magma mixing between a high silica, high 87Sr/86Sr (up to 0.7316) magma, and a low silica, low 87Sr/86Sr magma. Results provide insight into the composition of magmas derived from a sediment-infiltrated mantle source and document the fate of sediment recycled into Earth’s mantle.

Suggested Citation

  • Jenna V. Adams & Matthew G. Jackson & Frank J. Spera & Allison A. Price & Benjamin L. Byerly & Gareth Seward & John M. Cottle, 2021. "Extreme isotopic heterogeneity in Samoan clinopyroxenes constrains sediment recycling," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21416-9
    DOI: 10.1038/s41467-021-21416-9
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