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Related Experiment Video

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Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research
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A quantitative link between recycling and osmium isotopes.

Alexander V Sobolev1, Albrecht W Hofmann, Gerhard Brügmann

  • 1V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Street 19, 119991, Moscow, Russia. sobolev@geokhi.ru

Science (New York, N.Y.)
|July 26, 2008
PubMed
Summary

Recycled ocean crust in Iceland

Area of Science:

  • Geochemistry
  • Isotope Geochemistry
  • Petrology

Background:

  • Recycled subducted ocean crust is a key component in mantle source regions.
  • Previous studies have used elevated 187Os/188Os ratios and trace element compositions (high Ni, low Mn) to identify recycled crust.
  • The link between these tracers and their implications for mantle sources remain debated.

Purpose of the Study:

  • To investigate the relationship between osmium isotopes and trace elements in Icelandic lavas.
  • To strengthen the model of recycled crust contributing to mantle sources.
  • To estimate the osmium isotopic composition of recycled crust and mantle peridotite.

Main Methods:

  • Analysis of Quaternary lavas from Iceland.
  • Osmium (Os) isotope ratio measurements (187Os/188Os).

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  • Trace element analysis (Nickel, Manganese).

    • Main Results:

    • Demonstrated a direct link between elevated 187Os/188Os and high Ni/low Mn contents in Icelandic lavas.
    • Estimated the osmium isotopic composition of the recycled crustal component.
    • Constrained the composition of the peridotitic end-member to resemble present-day oceanic mantle.

    Conclusions:

    • The findings strengthen the model of recycled ocean crust influencing mantle composition.
    • Icelandic lavas are partly derived from an ancient crustal component (1.1–1.8 billion years old).
    • The study provides insights into the long-term evolution of Earth's mantle.