Results 221 to 230 of about 59,876 (275)
Some of the next articles are maybe not open access.
Science, 2007
GEOCHEMISTRY During Earth's history, heavy metals gradually decoupled from silicate rocks and sank toward the core, which became differentiated from the overlying mantle. Signatures of this process can be traced in the distribution of highly siderophile elements (Re and the platinum group elements Os, Ir, Ru, Pt, and Pd) that are chemically associated ...
openaire +1 more source
GEOCHEMISTRY During Earth's history, heavy metals gradually decoupled from silicate rocks and sank toward the core, which became differentiated from the overlying mantle. Signatures of this process can be traced in the distribution of highly siderophile elements (Re and the platinum group elements Os, Ir, Ru, Pt, and Pd) that are chemically associated ...
openaire +1 more source
Transcrystalline Melt Migration and Earth's Mantle
Science, 2006Plate tectonics and volcanism involve the formation, migration, and interaction of magma and gas. Experiments show that melt inclusions subjected to a thermal gradient migrate through olivine crystals, under the kinetic control of crystal-melt interface mechanisms.
Pierre, Schiano +3 more
openaire +2 more sources
Earth and Planetary Science Letters, 1989
Abstract The attainment of equilibrium between basalt and residual peridotite depends on the relative magnitudes of melt segregation rate and solid residue re-equilibration rate. Garnets and pyroxenes (and perhaps spinels) require at least 103 years to equilibrate with melt by volume inter-diffusion.
openaire +1 more source
Abstract The attainment of equilibrium between basalt and residual peridotite depends on the relative magnitudes of melt segregation rate and solid residue re-equilibration rate. Garnets and pyroxenes (and perhaps spinels) require at least 103 years to equilibrate with melt by volume inter-diffusion.
openaire +1 more source
Olivine flotation in mantle melt
Earth and Planetary Science Letters, 1993Abstract Molten komatiite and peridotite have been compressed in an octahedral multi-anvil device up to 10 GPa. Densities of the melts were measured at pressure intervals in the range 7 to 10 GPa by observing sinking and floating San Carlos olivines and synthetic forsterite marker spheres.
Carl B. Agee, David Walker
openaire +1 more source
Science, 1999
Most of Earth9s volume is silicate mantle, hidden from view by a layer of surface crust. A large geophysical experimental collaboration called MELT (mantle electromagnetic and tomography) has in recent years sought to detect and map a region of mantle partial melting to better understand its behavior. As Buck discusses in his Perspective,
openaire +1 more source
Most of Earth9s volume is silicate mantle, hidden from view by a layer of surface crust. A large geophysical experimental collaboration called MELT (mantle electromagnetic and tomography) has in recent years sought to detect and map a region of mantle partial melting to better understand its behavior. As Buck discusses in his Perspective,
openaire +1 more source
Science, 2017
Laboratory measurements suggest that the mantle is 60 K hotter than previously ...
openaire +3 more sources
Laboratory measurements suggest that the mantle is 60 K hotter than previously ...
openaire +3 more sources
Platinum group elements in mantle melts and mantle samples
Lithos, 2015Abstract A large data compilation has been assembled of platinum group element (PGE) analyses in mantle melts and mantle rocks, the latter including an assortment of xenoliths and obducted mantle massifs. The degree of correlation has been investigated among the PGEs and with other major element variables such as Al2O3, TiO2 and Mg number, and the ...
Stephen J. Barnes +2 more
openaire +1 more source
Mantle flow, melting, and dehydration of the Iceland mantle plume
Earth and Planetary Science Letters, 1999Abstract Recent studies have shown that the extraction of water from the mantle due to partial melting beneath mid-ocean ridges may increase the viscosity of the residuum by 2–3 orders of magnitude. We examine this rheological effect on mantle flow and melting of a ridge-centered mantle plume using three-dimensional numerical models. Results indicate
Ito, Garrett +3 more
openaire +2 more sources
Redox control during mantle/melt interaction
Geochimica et Cosmochimica Acta, 1992We have investigated redox systematics in the upper mantle under continents and ocean islands, using data on olivine, orthopyroxene, and spinel from both spinel lherzolites and coexisting pyroxenite xenoliths. Calculated ƒo2 values at 15 kb for continental xenoliths range from QFM−5.3 to QFM+0.8, with median values (M) of QFM−0.5 for volatile-free ...
H.E.F. Amundsen, E.-R. Neumann
openaire +1 more source
Nature, 1995
OCEANIC ridges are the dominant sites of energy and mass transfer from the Earth's interior to the crust, hydrosphere and atmosphere, but many key processes beneath ridges remain poorly understood. One outstanding problem is how partial melts in the asthenosphere concentrate into channels - initially, melts must leave their source by intergranular ...
openaire +2 more sources
OCEANIC ridges are the dominant sites of energy and mass transfer from the Earth's interior to the crust, hydrosphere and atmosphere, but many key processes beneath ridges remain poorly understood. One outstanding problem is how partial melts in the asthenosphere concentrate into channels - initially, melts must leave their source by intergranular ...
openaire +2 more sources