Results 71 to 80 of about 16,900 (220)

Low-degree mantle convection with strongly temperature- and depth-dependent viscosity in a three-dimensional spherical shell

, 2005
A series of numerical simulations of thermal convection of Boussinesq fluid with infinite Prandtl number, with Rayleigh number $10^7$, and with the strongly temperature- and depth- dependent viscosity in a three-dimensional spherical shell is carried out
Akira Kageyama, Breuer, Bunge, Bunge, Bunge, Davies, Hager, Hansen, Harder, Harder, Harder, Kageyama, Konopliv, Masaki Yoshida, McNamara, Phillips, Rappaport, Ratcliff, Ratcliff, Ratcliff, Reese, Schubert, Schubert, Sleep, Smith, Smith, Solomatov, Solomatov, Stemmer, Tackley, Tackley, Trompert, Wessel, Yoshida, Yoshida, Zhang, Zhong, Zhong, Zhong   +38 more
core   +1 more source

Genesis of crystalline crust and lithosphere of ancient platforms according to data on the hot heterogeneous accretion of the Earth

Литосфера, 2017
Compositions of gneisses from the Early Precambrian crystalline complexes of the Aldan shield and of mantle xenoliths from kimberlites plot along the magmatic fractionation trends.
Vladimir S. Shkodzinskii
doaj   +2 more sources

The origin and implications of primordial helium depletion in the Afar mantle plume

Communications Earth & Environment
Mantle plumes are responsible for the Earth’s largest volcanic provinces. In the prevailing paradigm, the deep mantle is less degassed than convecting shallow mantle, implying that plume-derived lavas have higher concentrations of primordial volatiles ...
Ugur Balci, Finlay M. Stuart, Jean-Alix Barrat, Antoniette G. Grima, Froukje M. van der Zwan   +4 more
doaj   +1 more source

Velocity Amplitudes in Global Convection Simulations: The Role of the Prandtl Number and Near-Surface Driving

, 2016
Several lines of evidence suggest that the velocity amplitude in global simulations of solar convection, U, may be systematically over-estimated. Motivated by these recent results, we explore the factors that determine U and we consider how these might ...
Ahlers, Augustson, Bercovici, Bridget O’Mara, Brun, Chandrasekhar, Chapman, Charbonneau, Clune, Davaille, Depassier, Deschamps, Deschamps, Fan, Featherstone, Gastine, Gastine, Gilman, Gilman, Glatzmaier, Gough, Greer, Guerrero, Hanasoge, Hanasoge, Hanasoge, Hotta, Hotta, Hotta, Jones, Karak, Kronbichler, Kyle C. Augustson, Käpylä, Lord, Mark S. Miesch, Miesch, Miesch, Nelson, Nicholas A. Featherstone, Nordlund, Racine, Romanowicz, Siggia, Spruit, Spruit, Yuen, Zhang   +47 more
core   +1 more source

A benchmark study on mantle convection in a 3-D spherical shell using CitcomS [PDF]

, 2008
As high-performance computing facilities and sophisticated modeling software become available, modeling mantle convection in a three-dimensional (3-D) spherical shell geometry with realistic physical parameters and processes becomes increasingly feasible.
Gurnis, Michael, McNamara, Allen, Moresi, Louis, Tan, Eh, Zhong, Shijie   +4 more
core   +1 more source

Volcanism by melt-driven Rayleigh-Taylor instabilities and possible consequences of melting for admittance ratios on Venus [PDF]

A large number of volcanic features exist on Venus, ranging from tens of thousands of small domes to large shields and coronae. It is difficult to reconcile all these with an explanation involving deep mantle plumes, since a number of separate arguments ...
Scott, D. R., Stevenson, D. J., Tackley, P. J.   +2 more
core   +1 more source

Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation [PDF]

, 2008
PRIMELT2.XLS software is introduced for calculating primary magma composition and mantle potential temperature (TP) from an observed lava composition. It is an upgrade over a previous version in that it includes garnet peridotite melting and it detects ...
Asimow, Paul D., Herzberg, C.
core   +2 more sources

Lawnmower Poetry and the Poetry of Lawnmowers

Critical Quarterly, EarlyView.
Francesca Gardner
wiley   +1 more source

A dynamic model of Venus's gravity field [PDF]

Unlike Earth, long wavelength gravity anomalies and topography correlate well on Venus. Venus's admittance curve from spherical harmonic degree 2 to 18 is inconsistent with either Airy or Pratt isostasy, but is consistent with dynamic support from mantle
Bills, B. G., Hager, B. H., Kiefer, W. S., Richards, M. A.   +3 more
core   +1 more source

Northward drift of the Azores plume in the Earth’s mantle

Nature Communications, 2019
Tectonic plate motions are often reconstructed based on the assumption that mantle plumes are fixed within the mantle. Here, the authors provide geochemical and geodynamic evidence to suggest that the asymmetry of the Azores thermal anomaly can be ...
Maëlis Arnould, Jérôme Ganne, Nicolas Coltice, Xiaojun Feng   +3 more
doaj   +1 more source