Tectonic plates in 3D mantle convection model with stress-history-dependent rheology
نویسندگان
چکیده
منابع مشابه
Self-Consistent Generation of Tectonic Plates in Time- Dependent, Three-Dimensional Mantle Convection Simulations. Part 1: Pseudo-Plastic Yielding
Presented here are the first three-dimensional simulations of mantle convection to display self-consistently-generated plate tectonic-like behavior which is continuous in space and time. Plate behavior arises through a reasonable material description of silicate deformation, with a simple yield stress being sufficient to give first-order plate-like behavior. Toroidal:poloidal ratios are within ...
متن کاملSelf-Consistent Generation of Tectonic Plates in Time- Dependent, Three-Dimensional Mantle Convection Simulations, Part 2: Strain Weakening and Asthenosphere
In a previous paper (“Part 1”) it was shown that a combination of temperature-dependent viscosity and visco-plastic yielding is sufficient to give rudimentary plate tectonic-like behavior in three-dimensional models of mantle convection. Here, the calculations are extended to include two complexities which have been suggested as important in localizing deformation at plate boundaries: strain we...
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[1] The scaling of plate tectonic convection is investigated by simulating thermal convection with pseudoplastic rheology and strongly temperature‐dependent viscosity. The effect of mantle melting is also explored with additional depth‐dependent viscosity. Heat flow scaling can be constructed with only two parameters, the internal Rayleigh number and the lithospheric viscosity contrast, the lat...
متن کاملMulti-scale dynamics and rheology of mantle flow with plates
[1] Fundamental issues in our understanding of plate and mantle dynamics remain unresolved, including the rheology and state of stress of plates and slabs; the coupling between plates, slabs and mantle; and the flow around slabs. To address these questions, models of global mantle flow with plates are computed using adaptive finite elements, and compared to a variety of observational constraint...
متن کاملRole of temperature-dependent viscosity and surface plates in spherical shell models of mantle convection
Layered viscosity, temperature-dependent viscosity, and surface plates have an important effect on the scale and morphology of structure in spherical models of mantle convection. We find that long-wavelength structures can be produced either by a layered viscosity with a weak upper mantle or temperature-dependent viscosity even in the absence of surface plates, corroborating earlier studies. Ho...
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ژورنال
عنوان ژورنال: Earth, Planets and Space
سال: 2020
ISSN: 1880-5981
DOI: 10.1186/s40623-020-01195-1