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Science 29 August 2003:
Vol. 301. no. 5637, pp. 1190 - 1191
DOI: 10.1126/science.1088835
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Perspectives

GEOPHYSICS:
Mantle Flow Revisited

Misha Bystricky

Seismic data from Earth's mantle have been interpreted in terms of high-strain deformation and recrystallization of mantle minerals, allowing conclusions about mantle flow to be drawn. In his Perspective, Bystricky argues that new data reported by Holtzman et al. necessitate a reinterpretation of these flow patterns in partially molten or hydrated regions. Earlier laboratory studies have been performed on dry olivine (the most common mantle mineral), but the new results show that partially molten and hydrated olivine shows very different flow behavior. This may be particularly important near ocean ridges and in subduction zones.

The author is at the Geologisches Institut, ETH Zürich, Sonneggstrasse 5, CH-8092 Zürich, Switzerland. E-mail: misha{at}erdw.ethz.ch

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Science. ISSN 0036-8075 (print), 1095-9203 (online)