Results 171 to 180 of about 552,470 (226)
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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
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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.
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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.
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Melting Temperatures in the Earth's Mantle
Tectonophysics, 1972Abstract In common with most recent investigators, we assume that olivine in the upper mantle goes through a phase change to spinel. Spinel at higher pressures breaks down to a post-spinel phase, possibly a mixture of the oxides, periclase and stishovite.
George C. Kennedy, Gary H. Higgins
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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,
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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,
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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
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Partial melting in the upper mantle
Physics of the Earth and Planetary Interiors, 1970The low velocity zone in tectonic and oceanic regions is too pronounced to be the effect of high temperature gradients alone. Partial melting is consistent with the low velocity, low Q and abrupt boundaries of this region of the upper mantle and is also consistent with measured heat flow values.
Anderson, Don L., Sammis, Charles
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Experimental Definition of Mantle Melting and Implications for Mantle Dynamics
Mineralogical Magazine, 1994The natural sampling of the Earth's Mantle by xenoliths or by magmas gives evidence for the presence of carbon and hydrogen within the upper mantle and extending into the Transition Zone. Models of accretion and studies of subduetion respectively provide arguments for degassing of primitive C-H species from the upper mantle and for re-cycling of ...
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Partial Melting and Melt Segregation in a Convecting Mantle
2000Various causes for mantle melting (decompression, heating or release of water) combined with current estimates of upper mantle temperatures and the state of stress in the lithosphere suggest that in many regions the asthenosphere might be partially molten, but melts may not always be able to rise to the surface.
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Early crust building enhanced on the Moon’s nearside by mantle melting-point depression
Nature Geoscience, 2020S. Elardo +3 more
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Melting and Mantle Sources in the Azores
2018The Azores archipelago is geochemically distinct amongst the oceanic intraplate volcanoes in that it has trace element and radiogenic Sr–Nd–Pb–Hf isotope signatures that cover much of the global variation observed in Ocean Island Basalts. Thus, it is the prime example of an intraplate melting anomaly preserving the compositional heterogeneity of the ...
Christoph Beier +2 more
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