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.
- Steven L. Goldstein
- Gad Soffer
- Peter J. Michael
