Results 241 to 250 of about 2,366,156 (316)
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On the rheology of the upper mantle
Reviews of Geophysics, 1973Mechanisms permitting the steady state deformation of crystalline solids are critically reviewed, and an approximate constitutive relationship is derived for fluid phase transport in a partial melt. (Fluid phase transport has a linear stress dependence and an inverse squared grain size dependence.) A set of rheologic material constants for olivine ...
R. L. Stocker, M. F. Ashby
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1967
Publisher Summary The term “mantle” signifies the region of the earth that extends from the Mohorovicic discontinuity (lower boundary of the crustal layers) down to the central core. The “upper mantle” delimits the outer part of the earth's mantle and can be regarded as a spheroidal shell lying from the Mohorovicic discontinuity to a depth of nearly ...
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Publisher Summary The term “mantle” signifies the region of the earth that extends from the Mohorovicic discontinuity (lower boundary of the crustal layers) down to the central core. The “upper mantle” delimits the outer part of the earth's mantle and can be regarded as a spheroidal shell lying from the Mohorovicic discontinuity to a depth of nearly ...
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The electrical conductivity of upper-mantle rocks: water content in the upper mantle
Physics and Chemistry of Minerals, 2007The electrical conductivity of upper-mantle rocks—dunite, pyroxenite, and lherzolite—was measured at ∼2–3 GPa and ∼1,273–1,573 K using impedance spectra within a frequency range of 0.1–106 Hz. The oxygen fugacity was controlled by a Mo–MoO2 solid buffer.
Duojun Wang +3 more
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Thermodynamics of the Upper Mantle
Geophysical Journal of the Royal Astronomical Society, 2010Summary An analysis is made of the energy input from the upper mantle to the crust since Palaeozoic times under the Japanese islands. It is argued that significant changes in this rate have occurred. These changes in energy input are interpreted in terms of unsteady mantle convection. The effect of the C layer on convection is discussed.
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Earth’s Structure, Upper Mantle
2011The upper mantle is defined as that part of the mantle between the crust and the phase transition of γ-olivine to perovskite. The total mass of the upper mantle is 1.06 × 1024 kg, about a quarter of the total mass of the mantle. Its volume, 2.95 × 1011 km3, is a third of the total volume of the mantle. Until the discovery of a major transition near 660-
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Contributions to Mineralogy and Petrology, 1969
Despite several lines of indirect evidence, there has hitherto been little unambiguous evidence of a volatile bearing phase in the upper mantle. Mica has been found as a primary phase in several specimens of peridotite and one specimen of garnet lherzolite from the Lashaine volcano, northern Tanzania.
Dawson, J. B., Powell, D. G.
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Despite several lines of indirect evidence, there has hitherto been little unambiguous evidence of a volatile bearing phase in the upper mantle. Mica has been found as a primary phase in several specimens of peridotite and one specimen of garnet lherzolite from the Lashaine volcano, northern Tanzania.
Dawson, J. B., Powell, D. G.
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Eos, Transactions American Geophysical Union, 1964
The Upper Mantle Project was proposed in 1960 as an international scientific program, in which the attention of geophysisists would be directed toward the Earth's interior—in particular toward the outermost 1000 km of the Earth's radius, or that part of the Earth whose processes most influence the development of the Earth's crust.
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The Upper Mantle Project was proposed in 1960 as an international scientific program, in which the attention of geophysisists would be directed toward the Earth's interior—in particular toward the outermost 1000 km of the Earth's radius, or that part of the Earth whose processes most influence the development of the Earth's crust.
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Journal of Geodynamics, 1995
The mineralogy of the upper mantle is reviewed in the context of the petrology of xenolith suites entrained in alkali basalts and kimberlites. Low pressure (spinel) and high pressure (garnet) lherzolites (olivine + clinopyroxene + orthopyroxene) are the most abundant fertile (i.e.
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The mineralogy of the upper mantle is reviewed in the context of the petrology of xenolith suites entrained in alkali basalts and kimberlites. Low pressure (spinel) and high pressure (garnet) lherzolites (olivine + clinopyroxene + orthopyroxene) are the most abundant fertile (i.e.
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Eos, Transactions American Geophysical Union, 1966
The International Upper Mantle Project (UMP) is one of the main programs of the International Council of Scientific Unions (ICSU). The UMP is coordinated by the International Upper Mantle Committee, an IUGG Committee set up jointly by the International Union of Geodesy and Geophysics and the International Union of Geological Sciences, with rules ...
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The International Upper Mantle Project (UMP) is one of the main programs of the International Council of Scientific Unions (ICSU). The UMP is coordinated by the International Upper Mantle Committee, an IUGG Committee set up jointly by the International Union of Geodesy and Geophysics and the International Union of Geological Sciences, with rules ...
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