Results 101 to 110 of about 822 (141)

Rheology of the upper mantle and the mantle wedge: A view from the experimentalists

2003
In 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
openaire   +1 more source

Mantle rheology, convection and rotational dynamics

Physics of the Earth and Planetary Interiors, 1993
Abstract 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, Ctirad Matyska, David A. Yuen, Andrei V. Malevsky, Helmut Harder   +4 more
openaire   +1 more source

Diffusion Creep in Perovskite: Implications for the Rheology of the Lower Mantle

Science, 1992
High-temperature creep experiments on polycrystalline perovskite (CaTiO 3 ), an analog of (Mg,Fe)SiO 3 perovskite of the lower mantle, suggest that (grain size-sensitive) diffusion creep is important in the lower mantle and show that creep rate is enhanced by the transformation from the ...
S, Karato, P, Li
openaire   +2 more sources

Laboratory Constraints on the Rheology of the Upper Mantle

Reviews in Mineralogy and Geochemistry, 2002
The dynamics of convection and the mechanical behavior of the lithosphere are controlled by the rheology of upper mantle rocks. For this reason, experimental and theoretical studies on the rheology of olivine aggregates have been fields of active research for at least the last 35 years. In this short-course paper, I briefly review some experimental and
openaire   +1 more source

The Microphysical Approach to Mantle Rheology

1991
The rheology of the mantle can be estimated from geophysical observables related to the Earth’s response to changes in surface load and lateral density differences, and from theoretical and experimental knowledge on creep mechanisms in polycrystalline silicates (microphysical approach).
openaire   +1 more source

Geothermal models and mantle rheology in Australia

Tectonophysics, 1989
Abstract Geothermal models can be constructed for Australia consistent with seismic refraction data. Variations in velocity can be assumed to coincide with variations in thermal conductivity and heat production for discrete blocks representing a complex geological section.
openaire   +1 more source

Mantle devolatilization and rheology in the framework of planetary evolution

AIP Conference Proceedings, 1995
We 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
openaire   +1 more source

Rheology of the Earth's mantle: A historical review

Gondwana Research, 2010
Abstract 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
openaire   +1 more source

Diffusion creep, dislocation creep, and mantle rheology

Physics of the Earth and Planetary Interiors, 1984
Abstract Viscosity-depth profiles in the Earth's mantle are estimated on the basis of microrheological equations for ultrabasic silicates, the preliminary reference Earth model (PREM), and two assumed geotherms (one with, and one without, a lower mantle upper thermal boundary layer).
G. Ranalli, B. Fischer
openaire   +1 more source

Mantle rheology from a geodynamical standpoint

La Rivista del Nuovo Cimento, 1982
D. Yuen, R. Sabadini, E. Boschi
openaire   +2 more sources