Results 231 to 240 of about 2,366,156 (316)

Bridging the gap between subduction dynamics and the long-term strength of the Sunda megathrust. [PDF]

Nat Commun
Capitanio FA, Gollapalli T, Munukutla R, Graciosa JC, Mohd Z, Beall A, Dal Zilio L.   +6 more
europepmc   +1 more source

Cenozoic evolution of earth's strongest geoid low illuminates mantle dynamics beneath Antarctica. [PDF]

Sci Rep
Glišović P, Forte AM.
europepmc   +1 more source

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Rheology of the Upper Mantle: A Synthesis

Science, 1993
Rheological properties of the upper mantle of the Earth play an important role in the dynamics of the lithosphere and asthenosphere. However, such fundamental issues as the dominant mechanisms of flow have not been well resolved. A synthesis of laboratory studies and geophysical and geological observations shows that transitions between diffusion and ...
S-I Karato, Patrick Wu
exaly   +5 more sources

Ferropericlase—a lower mantle phase in the upper mantle

Lithos, 2004
Experiments on compositions along the join MgO–NaA3+Si2O6 (A=Al, Cr, Fe3+) show that sodium can be incorporated into ferropericlase at upper mantle pressures in amounts commonly found in natural diamond inclusions. These results, combined with the observed mineral parageneses of several diamond inclusion suites, establish firmly that ferropericlase ...
Gerhard P Brey, Andrei Girnis, Thomas Stachel   +2 more
exaly   +2 more sources

Calcium isotope fractionation during magmatic processes in the upper mantle

Geochimica et Cosmochimica Acta, 2019
The Earth’s mantle has a complex history of partial melting and melt-peridotite reaction that have redistributed Ca and other elements between residues and melting products.
Chunfei Chen, W. Dai, Zaicong Wang, Yongsheng Liu, Ming Li, H. Becker, S. Foley   +6 more
semanticscholar   +1 more source

On the seismic discontinuities in the upper mantle

Physics of the Earth and Planetary Interiors, 1995
Abstract Mode conversions and reflections at upper-mantle seismic discontinuities may be contained in earthquake seismograms as weak secondary phases that often become visible only after special signal processing techniques are applied to the data. To extract fully the information these secondary phases carry about the three-dimensional structure of ...
Bock, G., Gossler, J., Hanka, W., Kind, R., Kosarev, G., Petersen, N., Stammler, K., Vinnik, L.   +7 more
openaire   +3 more sources

Metal saturation in the upper mantle

Nature, 2007
The oxygen fugacity f(O2)of the Earth's mantle is one of the fundamental variables in mantle petrology. Through ferric-ferrous iron and carbon-hydrogen-oxygen equilibria, f(O2) influences the pressure-temperature positions of mantle solidi and compositions of small-degree mantle melts.
Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Kamenetsky, V., Kuzmin, D.   +5 more
openaire   +3 more sources

Diamond Accumulation in the Upper Mantle

Nature, 1970
THE present high gradient of density in the upper mantle provides neutral buoyancy zones in which certain minerals may have been accumulated in the past or to which they may still be migrating. The necessary condition for progressive accumulation in such a zone is that the mineral concerned has opportunities of rising or sinking relative to its ...
openaire   +2 more sources

Phase Changes in the Upper Mantle

Science, 1967
The C-region of the upper mantle has two transition regions 75 to 90 kilometers thick. In western North America these start at depths of 365 kilometers and 620 kilometers and involve velocity increases of about 9 to 10 percent. The locations of these transition regions, their general shape, and their thicknesses are consistent with, first, the ...
openaire   +3 more sources

Processes in the upper mantle

Tectonophysics, 1965
Abstract All current tectonic hypotheses assign the cause of vertical crustal movements to processes within the earth. Some suppose an expansion and contraction of mantle material, probably caused by physical transitions (polymorphic, phase and electronic) and chemical reactions.
S.I. Subbotin, G.L. Naumchik, I.Sh. Rakhimova   +2 more
openaire   +1 more source