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Boron and oxygen isotope evidence for recycling of subducted components over the past 2.5 Gyr

Author

Listed:
  • Simon Turner

    (GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia)

  • Sonia Tonarini

    (Istituto di Geoscienze e Georisorse, Via Moruzzi 1, 56147 Pisa, Italy)

  • Ilya Bindeman

    (University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA
    Present address: Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA.)

  • William P. Leeman

    (National Science Foundation, 4201 Wilson Blvd, Arlington, Virginia 22230, USA)

  • Bruce F. Schaefer

    (School of Geosciences, Monash University, PO Box 28E, Clayton, Victoria 3800, Australia)

Abstract

Mantle recycling The volcanic and seismological activity of the Earth are indicative of its active interior and the recycling of surface oceanic plates through the mantle, but the nature and timescales of this process are not well understood. To help constrain the extent of such deep recycling, Turner et al. analysed the oxygen, niobium, boron and osmium isotope content of basalts from the Azores Islands. The results suggest that some of this material derives from melt- and fluid-depleted lithospheric mantle that is at least 2.5 billion years old, whereas other Azores basalts are thought to contain a contribution from melt-enriched basalt some 3 billion years old. It seems likely that both components derive from an Archaean oceanic plate that was subducted and stored at depth, until thermal buoyancy caused it to rise beneath the Azores islands some 3 billion years later.

Suggested Citation

  • Simon Turner & Sonia Tonarini & Ilya Bindeman & William P. Leeman & Bruce F. Schaefer, 2007. "Boron and oxygen isotope evidence for recycling of subducted components over the past 2.5 Gyr," Nature, Nature, vol. 447(7145), pages 702-705, June.
    • Handle: RePEc:nat:nature:v:447:y:2007:i:7145:d:10.1038_nature05898
    DOI: 10.1038/nature05898
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