Does partial melting reduce the creep strength of the upper mantle?

Details Does partial melting reduce the creep strength of the upper mantle? Does partial melting reduce the creep strength of the upper mantle?

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..309k&link_type=abstract

Nature, Volume 319, Issue 6051, pp. 309-310 (1986).

Physics

33

Scientific paper

The seismic low-velocity zone has been thought to correspond to a zone of partial melting that significantly reduces the creep strength, making it possible for the plates to decouple from the underlying mantle1,2. This view is examined here in light of recent experimental results which show that water has more effect on the creep strength of olivine3-6 than does partial melting7,8 and that the former depends on the fugacity of water5,6. When there is a limited amount of water, partial melting will result in depletion of water from olivine, and therefore have a hardening, rather than a softening, effect.

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