The return of subducted continental crust in Samoan lavas

Matthew G. Jackson (), Stanley R. Hart, Anthony A. P. Koppers, Hubert Staudigel, Jasper Konter, Jerzy Blusztajn, Mark Kurz and Jamie A. Russell
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Matthew G. Jackson: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution Joint Program
Stanley R. Hart: Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543-1525, USA
Anthony A. P. Koppers: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0225, USA
Hubert Staudigel: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0225, USA
Jasper Konter: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0225, USA
Jerzy Blusztajn: Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543-1525, USA
Mark Kurz: Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543-1525, USA
Jamie A. Russell: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0225, USA

Nature, 2007, vol. 448, issue 7154, 684-687

Abstract: Earth to ocean Plate tectonics injects chemically enriched oceanic crust and sediments into the mantle at subduction zones. Vigorous mantle mixing dilutes and destroys the chemical signature of these materials, so that if they return to the surface in mantle plumes, they are hard to recognize. The discovery of remarkably enriched 87Sr/86Sr and 143Nd/144Nd isotope signatures in submarine Samoan lavas will help clarify matters. The data provide clear evidence for the presence of recycled upper continental crust in the Samoan mantle and also support the idea that recycled continental material is involved in the formation of one of the mantle's isotopically distinct geochemical reservoirs, the so-called enriched mantle 'EM2' component.

Date: 2007
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DOI: 10.1038/nature06048

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