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

Mar 10, 2017 Climb in the mantle Results

In a paper just isued in Science Advances, we propose a new creep mechanism which accounts for the flow of bridgmanite in the lower mantle

Under pressure, the usual creep mechanisms where plastic strain is produced by dislocation glide are strongly inhibited. In this paper, we propose a new creep mechanism where strain results from dislocation climb powered by emission and absorption of vacancies. We show that this mechanism named "pure climb creep" can account for the strain-rates in the lower mantle.

 

 

We suggest that pure climb creep is the dominant mechanism for bridgmanite in the lower mantle and also probably for silicaes in planetary interiors.

 

F. Boioli, P. Carrez, P. Cordier, B. Devincre, K. Gouriet, P. Hirel, A. Kraych, S. Ritterbex (2016) Pure climb creep mechanism drives flow in the Earth’s lower mantle. Science Advances, 3, e1601958, doi: 10.1126/sciadv.1601958