Results 51 to 60 of about 5,696 (230)
P and S Wave Anisotropic Tomography of the Banda Subduction Zone
Geophysical Research Letters, 2023 In subduction zones with slab‐slab interactions, the pattern of mantle convection is very complex and still unclear. In this study, we jointly invert a large number of P and S wave arrival time data of local earthquakes for 3‐D isotropic and anisotropic ...
Yuanyuan Hua, Dapeng Zhao, Yi‐Gang Xu
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Mixing properties of thermal convection in the earth's mantle [PDF]
, 1996 The structure of mantle convection will greatly influence the generation and the survival of compositional heterogeneities. Conversely, geochemical observations can be used to obtain information about heterogeneities in the mantle and then, with ...
Mantle dynamics & theoretical geophysics +2 more
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Geochemistry, Geophysics, GeosystemsThe compositional evolution of the Earth's mantle is the result of mantle differentiation and thermal evolution. Partial melting of mantle materials produces geochemical heterogeneities, allows for degassing and depends on the thermal state of the mantle,
Nicolas Récalde +4 more
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A seismological study of the mantle beneath Iceland [PDF]
, 2000 Iceland has long been thought to be underlain by a thermal upwelling, or plume, rising from deep within the mantle. This study tests this hypothesis, by a) seeking evidence for a plume in the lower mantle in azimuth anomalies at the NORSAR array and b ...
Pritchard, Matthew James +1 more
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On the Role of Rheological Memory for Convection‐Driven Plate Reorganizations
Geophysical Research Letters, 2022 Understanding the temporal variability of plate tectonics is key to unraveling how mantle convection transports heat, and one critical factor for the formation and evolution of plate boundaries is rheological “memory,” that is, the persistence of weak ...
L. Fuchs, T. W. Becker
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Energy balance of mantle convection [PDF]
, 1968 A calculation of the thermodynamic efficiency of a convecting upper mantle with finite strength is extended to the lower mantle by appealing to the non-equilibrium ellipticity for a value of strength.
Stacey, F. D.
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On the evolution of the water ocean in the plate-mantle system
Progress in Earth and Planetary Science, 2018 Here, we investigate a possible scenario of surface seawater evolution in the numerical simulations of surface plate motion driven by mantle dynamics, including thermo-chemical convection and water migration, from the early to present-day Earth to ...
Takashi Nakagawa +3 more
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Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites [PDF]
, 2006 Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e.
Lesher, C. M. +25 more
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Geochemistry, Geophysics, GeosystemsMineral phase transitions can either hinder or accelerate mantle flow. In the present day, the formation of the bridgmanite + ferropericlase assemblage from ringwoodite at 660 km depth has been found to cause weak and intermittent layering of mantle ...
Ranpeng Li +4 more
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Tectonic plates in 3D mantle convection model with stress-history-dependent rheology
Earth, Planets and Space, 2020 Plate tectonics is a key feature of the dynamics of the Earth’s mantle. By taking into account the stress-history-dependent rheology of mantle materials, we succeeded in realistically producing tectonic plates in our numerical model of mantle convection ...
Takehiro Miyagoshi +2 more
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