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- W4322007070 abstract "It is well-established that the mantle exerts a strong control on the geodynamic processes and their expressions observed at the surface. One of the key components in mantle-surface interaction is rheology, yet, the details of this rheological coupling remain not well understood. This is particularly true for large to global scales, which are difficult to assess in the field or in the lab. For instance, rheological inheritance is thought to influence the onset location of plate boundaries and their subsequent evolution. But the originating physical processes and timescales over which such rheological inheritance applies are still debated. Moreover, differences in the rheological coupling between mantle and surface are expected to change first-order surface observables, such as topography.Here, we use numerical geodynamic models of whole-mantle convection to test the sensitivity of surface tectonics to different rheological assumptions, for instance in terms of deformation mechanisms at play and rheological inheritance. We show that the self-consistent generation of plate tectonics from mantle convection is altered by the use of a composite rheology (with co-existing diffusion and dislocation creep), by the consideration of mantle grain-size evolution, as well as by simple parameterisations of rheological memory such as strain-weakening. Using a set of quantitative diagnostics, we also demonstrate how such rheological complexities affect surface topography." @default.
- W4322007070 created "2023-02-26" @default.
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- W4322007070 date "2023-05-15" @default.
- W4322007070 modified "2023-10-16" @default.
- W4322007070 title "Mantle controls on geodynamic processes and their surface expressions: a global approach" @default.
- W4322007070 doi "https://doi.org/10.5194/egusphere-egu23-6948" @default.
- W4322007070 hasPublicationYear "2023" @default.
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