1. Andreas Stracke is in the Institute of Isotope Geochemistry and Mineral Resources, ETH Zürich, Clausiusstrasse 25, 8092 Zürich, Switzerland.
   e-mail: stracke@erdw.ethz.ch

Abstract

Extraction of the continental crust has left the Earth's mantle depleted in certain elements. Some rocks from the Arctic Ocean floor suggest that the extent of depletion and heterogeneity in the Earth's mantle may be greater than we thought.

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