Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pepi..179...87h&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 179, Issue 1-2, p. 87-95.
Physics
1
Scientific paper
Even though the garnet phase is the second most abundant phase in the upper-mantle and transition-zone, no previous studies have directly measured the effect of majorite content on the strength of garnet under mantle conditions. Here we report the results of constant strain-rate and stress-relaxation experiments on garnets in the pyrope-majorite solid solution which constrain the strength of majoritic containing garnets relative to pyrope as a function of majorite content and temperature. We find that at temperatures below 650 °C both pure pyrope and majoritic garnets have the same strength. Conversely, above 650 °C we find that majoritic garnets are initially stronger than pure pyrope but weaken with increasing temperature and majorite content and with significant majorite contents are weaker than pyrope above approximately 800 °C. We develop a flow law for the entire pyrope-majorite solid solution as a function of temperature and majorite content.
Brodholt John P.
Dobson David P.
Hunt Simon A.
Li Li
Weidner Donald J.
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