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Oxygen isotope evidence against bulk recycled sediment in the mantle sources of Pitcairn Island lavas

Nature volume 377, pages 138–141 (1995)Cite this article

Abstract

THE hypothesis that subducted sediments survive dehydration and/or melting in subduction zones to become long-lived geo-chemical reservoirs in the mantle has gained support in recent years1–3. Evidence for such reservoirs is found in the geochemistry of ocean island basalts (OIBs), some of which have isotopic and trace-element characteristics plausibly associated with ancient sedimentary components. In particular, the EM1 mantle end-member has been identified, principally on the basis of strontium, neodymium and lead isotopes, and has been proposed to carry a large sediment fraction3–5. Oxygen isotopes should be sensitive indicators of subducted sediment in the sources of OIBs because minerals that interact with water at low temperatures near the Earth's surface (during weathering, for example) become enriched in 18O relative to 16O (ref. 6). We report here the 18O:16O ratios of phenocrysts from basalts from Pitcairn Island (southeast Pacific Ocean), which, together with the nearby Pitcairn seamounts, contain among the most extreme EM1 signatures known. We find the oxygen isotope ratios of the phenocrysts to be indistinguishable from the average for mantle peridotite. These results show that the end-member EM1 signature can be produced in the absence of substantial (>l-2%) recycled sediment in the mantle.

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Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, 91125, USA

    John M. Eiler, Kenneth A. Farley & Edward M. Stolper

  2. Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin, 53706, USA

    John W. Valley

  3. Department of Terrestrial Magnetism, Carnegie Institute of Washington, 5241 Broad Branch Road, NW, Washington, DC, 20015, USA

    Eric H. Hauri

  4. Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093, USA

    Harmon Craig

Authors
  1. John M. Eiler
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  2. Kenneth A. Farley
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  4. Edward M. Stolper
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  5. Eric H. Hauri
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  6. Harmon Craig
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Eiler, J., Farley, K., Valley, J. et al. Oxygen isotope evidence against bulk recycled sediment in the mantle sources of Pitcairn Island lavas. Nature 377, 138–141 (1995). https://doi.org/10.1038/377138a0

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