RheoMan: a five-year, ERC-funded (Advanced Grant), project to model the rheology of the Earth's mantle

Apr 19, 2015 Strength under pressure General

Marquardt & Miyagi show that that the strength of ferropericlase increases by a factor of three at pressures from 20 to 65 GPa

In their paper entitled "Slab stagnation in the shallow lower mantle linked to an increase in mantle viscosity" published in april 2015 in Nature Geoscience, Marquardt & Miyagi use synchrotron radial X-ray diffraction to measure in situ the deformation behaviour of ferropericlase at pressures of up to 96 GPa. They find a pressure induced strength increase compatible with the theoretical predictions of J. Amodeo:

 

 

See also the News & Views of P. Cordier on this paper