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Nature 392, 650-653 (16 April 1998) | doi:10.1038/33531
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Mantle mineralogy: Olivine emerges from isolation
Craig R. Bina1
Near a depth of 410 km, the speeds at which seismic waves travel in Earth's mantle rise sharply, an observation long attributed to high-pressure transformation of the mineral olivine to wadsleyite. However, seismological studies of this '410-km discontinuity' reveal wave-speed increases that are smaller and more abrupt than expected from extrapolation of the laboratory behaviour of these minerals to mantle conditions.
- Craig R. Bina is in the Department of Geological Sciences, Northwestern University, Evanston, Illinois 60208-2150, USA.
e-mail: Email: craig@earth.nwu.edu
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