Origin of a ‘Southern Hemisphere’ geochemical signature in the Arctic upper mantle

Steven L. Goldstein (), Gad Soffer, Charles H. Langmuir, Kerstin A. Lehnert, David W. Graham and Peter J. Michael
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Steven L. Goldstein: Lamont-Doherty Earth Observatory of Columbia University,
Gad Soffer: Lamont-Doherty Earth Observatory of Columbia University,
Charles H. Langmuir: Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA
Kerstin A. Lehnert: Lamont-Doherty Earth Observatory of Columbia University,
David W. Graham: College of Ocean and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA
Peter J. Michael: University of Tulsa, 600 South College Avenue Tulsa, Oklahoma 74104, USA

Nature, 2008, vol. 453, issue 7191, 89-93

Abstract: An abrupt mantle compositional boundary exists on the the Gakkel ridge, with basalts from west of the boundary displaying affinities to the 'Dupal' isotopic province, previously observed only in the Southern Hemisphere. It is concluded that the source of the Dupal signature is subcontinental lithospheric mantle that delaminated and became integrated into the convecting Arctic asthenosphere.

Date: 2008
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DOI: 10.1038/nature06919

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