Results 161 to 170 of about 293,215 (210)

The Influence of Partial Melt on Mantle Convection

2012
The thermo-chemical evolution of a one-plate planet like Mars strongly influences its atmospheric evolution via volcanic outgassing, which is linked to the production of partial melt in the mantle. In earlier thermal evolution and convection models melt production has been considered by the release and consumption of latent heat, the formation of crust
Tilman Spohn, Ana-Catalina Plesa, Ana-Catalina Plesa   +2 more
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Experimental deformation of partially-melted granite

Contributions to Mineralogy and Petrology, 1979
An account is given of the experimental deformation of partially-melted granite with melt fractions up to 25% at 800 °C and 300 MPa confining pressure in constant strainrate tests between 10−3 and 10−6 S−1, creep tests and cycling tests. Microscopic study reveals that under these conditions most of the uniform deformation prior to macroscopic shear ...
Paterson, M. S., Molen, I. van der
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Partial Melting and Deformation

Reviews in Mineralogy and Geochemistry, 2002
The physical properties of partially molten rocks are directly coupled to the grain-scale as well as the broader scale distribution of the melt phase. At the grain scale, if melt forms isolated pockets in a silicate matrix, its influence on plastic flow is generally relatively minor.
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The influence of partial melting and melt migration on the rheology of the continental crust

Journal of Geodynamics, 2016
Abstract The presence of melt during deformation produces a drastic change in the rheological behavior of the continental crust; rock strength is decreased even for melt fractions as low as ∼7%. At pressure/temperature conditions typical of the middle to lower crust, melt-bearing systems may play a critical role in the process of strain localization ...
Geane Carolina G. Cavalcante, Gustavo Viegas, Marcos Egydio da Silva, Carlos José Archanjo   +3 more
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Partial melting of crustal rocks

Engineering Geology, 1989
Abstract Shales and graywackes were first metamorphosed at 650°C and then partially melted at 700 and 750°C at 2, 4, 6, and 8 kilobars in the presence of 0.75m NaCl−0.45m KCl and 0.225m CaCl2−0.750m NaCl solutions. In experiments with shales,KK+Na ratio in the decreases with increasing pressure at 650 and 700°C; however, at 750°C this ratio is equal ...
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Partial melting of metagreywackes, Part II. Compositions of minerals and melts

Contributions to Mineralogy and Petrology, 1997
A series of experiments on the fluid-absent melting of a quartz-rich aluminous metagreywacke has been carried out. In this paper, we report the chemical composition of the phases present in the experimental charges as determined by electron microprobe.
Jean-Marc Montel, Daniel Vielzeuf
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Criteria for the recognition of partial melting

Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 1999
Abstract Partial melting changes rocks from single phase (solid) to two phase (solid+melt) systems. The bulk viscosity decreases as the melt fraction increases and this effect raises the rate of deformation and heat transfer, as well as causing crustal differentiation.
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Importance of the ‘shape’ of the melting regime during partial melting of the mantle

Nature, 1985
The amount of melt formed in individual stream lines of upper mantle rocks passing through a partial melting regime increases from zero at the edge to a maximum at the central axis. Relationships between aggregated liquid compositions from such melting regimes and the source mantle should be obained by integration of the appropriate equations for ...
M. J. O'Hara, M. J. O'Hara
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Partial Melting

2016
Partial melting is the transformation of some fraction of the mass of a solid rock into a liquid as a result of decompression, heat input, or addition of a flux. The resulting liquid is called magma and becomes lava if it erupts from a volcano. The understanding that partial, rather than complete, melting is the norm in natural systems is essential to ...
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Attenuation in partially melted material

Journal of Geophysical Research, 1968
Expressions for the complex moduli are derived for two models that simulate the structure of partially melted material. In one model, isolated lens-shaped inclusions of melt form the liquid phase, whereas in the other model the liquid phase is a continuous film of melt surrounding approximately spherical solid grains.
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