Results 171 to 180 of about 180,659 (212)
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On the rheology of the upper mantle
Reviews of Geophysics, 1973Mechanisms permitting the steady state deformation of crystalline solids are critically reviewed, and an approximate constitutive relationship is derived for fluid phase transport in a partial melt. (Fluid phase transport has a linear stress dependence and an inverse squared grain size dependence.) A set of rheologic material constants for olivine ...
R. L. Stocker, M. F. Ashby
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Rheology of the Earth's mantle: A historical review
Gondwana Research, 2010Abstract Historical development of our understanding of rheological properties of the Earth's mantle is reviewed. Rheological properties of the Earth's mantle control most of the important geological processes such as the style of mantle convection (e.g., stagnant lid versus plate tectonics) and the nature of thermal evolution. However, inferring the
Shun-Ichiro Karato
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A model of dislocation-controlled rheology for the mantle
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1981Abstract The dislocation microstructure of mantle materials can account simultaneously for long-term steady-state creep, and for stress wave attenuation at seismic frequencies. The hypothesis that a single microstructural model explains therheology for characteristic times ranging from 1 to 1010 seconds can be used to restrict the ...
Minster, J. B., Anderson, D. L.
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Multi‐scale dynamics and rheology of mantle flow with plates [PDF]
Journal of Geophysical Research, 2012 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 ...
Georg Stadler +2 more
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Physics of the Earth and Planetary Interiors, 1981
Abstract The rheology of the lower mantle of the Earth is examined from the viewpoint of solid state physics. Recent developments in high-pressure research suggest that the lower mantle contains a considerable amount of (Mg, Fe)O with Fe/Mg + Fe = 0.2–0.3.
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Abstract The rheology of the lower mantle of the Earth is examined from the viewpoint of solid state physics. Recent developments in high-pressure research suggest that the lower mantle contains a considerable amount of (Mg, Fe)O with Fe/Mg + Fe = 0.2–0.3.
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2023
Earth’s upper mantle rheology controls lithosphere-asthenosphere coupling and thus its surface tectonics. Although rock deformation experiments and seismic anisotropy measurements indicate that dislocation creep can occur in the Earth's uppermost mantle, the role of composite rheology (including both diffusion and dislocation creep) on global-
Maelis Arnould +2 more
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Earth’s upper mantle rheology controls lithosphere-asthenosphere coupling and thus its surface tectonics. Although rock deformation experiments and seismic anisotropy measurements indicate that dislocation creep can occur in the Earth's uppermost mantle, the role of composite rheology (including both diffusion and dislocation creep) on global-
Maelis Arnould +2 more
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RHEOLOGY OF PARTIALLY MOLTEN MANTLE ROCKS
Annual Review of Earth and Planetary Sciences, 1996▪ Abstract Over the past decade, significant progress has been made in understanding the rheological properties of partially molten mantle rocks. Laboratory experiments demonstrate that a few percent of melt can have an unexpectedly large effect on viscosity both in the diffusional creep regime and in the dislocation creep regime.
David L. Kohlstedt, Mark E. Zimmerman
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Rheology of the upper mantle and the mantle wedge: A view from the experimentalists
2003In this manuscript we review experimental constraints for the viscosity of the upper mantle. We first analyze experimental data to provide a critical review of flow law parameters for olivine aggregates and single crystals deformed in the diffusion creep and dislocation creep regimes under both wet and dry conditions.
Greg Hirth, David Kohlstedt
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Mantle rheology, convection and rotational dynamics
Physics of the Earth and Planetary Interiors, 1993Abstract We have examined theoretically the effects of mantle convection on Earth rotational dynamics for both viscoelastic and viscous mantles. Strategies for numerical computations are proposed. A linear Maxwell viscoelastic rheology accounting for finite deformations associated with mantle convection is considered. For both rheologies the two sets
Jiří Moser +4 more
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Mantle devolatilization and rheology in the framework of planetary evolution
AIP Conference Proceedings, 1995We investigate the thermal history of an Earth‐like planet with the help of a parameterized mantle convection model including the volatile exchange. The weakening of mantle silicates by dissolved water is described by a functional relationship between creep rate and water fugacity.
S. Franck, Ch. Bounama
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