@misc{10481/85018,
year = {2023},
month = {8},
url = {https://hdl.handle.net/10481/85018},
abstract = {Earth's upper mantle rheology controls lithosphere-asthenosphere coupling and thus surface
tectonics. Rock deformation experiments and seismic anisotropy measurements indicate that composite
rheology (co-existing diffusion and dislocation creep) occurs in the Earth's uppermost mantle, potentially
affecting convection and surface tectonics. Here, we investigate how the spatio-temporal distribution of
dislocation creep in an otherwise diffusion-creep-controlled mantle impacts the planform of convection
and the planetary tectonic regime as a function of the lithospheric yield strength in numerical models of
mantle convection self-generating plate-like tectonics. The low upper-mantle viscosities caused by zones of
substantial dislocation creep produce contrasting effects on surface dynamics. For strong lithosphere (yield
strength > 35 MPa), the large lithosphere-asthenosphere viscosity contrasts promote stagnant-lid convection.
In contrast, the increase of upper mantle convective vigor enhances plate mobility for lithospheric strength
<35 MPa. For the here-used model assumptions, composite rheology does not facilitate the onset of plate-like
behavior at large lithospheric strength.},
organization = {Norwegian
Research Council funding to the Centre
for Earth Evolution and Dynamics
(223272) and to TR (PLATONICS,
276032)},
organization = {CNRSINSU-
PNP and UCBL-BQR fundings},
organization = {Computations were performed on Stallo
and Saga Uninett Sigma2 facilities
(nn9010k, ns9010k)},
publisher = {Wiley},
title = {Effects of Composite Rheology on Plate-Like Behavior in Global-Scale Mantle Convection},
doi = {10.1029/2023GL104146},
author = {Arnould, Maëlis and Rolf, Tobias and Cabeza Córdoba, Antonio Manjón},
}