Mathematics – Logic
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.296...23c&link_type=abstract
Earth and Planetary Science Letters, Volume 296, Issue 1-2, p. 23-33.
Mathematics
Logic
7
Scientific paper
Deformation experiments were conducted in a Griggs-type apparatus to constrain the rheology of antigorite serpentinite at high temperatures and pressures. Samples deformed at temperatures of 400-625 °C and pressures of 0.85-1.5 GPa experienced semi-brittle deformation resulting in localization on faults at 5% to 25% strain; samples deformed at 300 °C exhibited transitional behavior. The stresses measured for our samples are in good agreement with recent experiments conducted in the Deformation-DIA apparatus. However, our results indicate that steady state ductile flow is not achieved, in contrast with interpretations based on the Deformation-DIA experiments. Extrapolation of our data to geologic conditions suggests that serpentinites may be weak enough during localized frictional sliding to account for slab-wedge decoupling inferred from geologic observations. Experiments conducted above the thermal stability of antigorite, at 700 °C and 1.5 GPa, show evidence for distributed deformation; this observation does not support the hypothesis that intermediate depth earthquakes result directly from dehydration embrittlement. In addition, samples exhibit velocity strengthening from 300 to 700 °C, a frictional behavior that inhibits earthquake nucleation.
Chernak Linda J.
Hirth Greg
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