Results 211 to 220 of about 25,796 (267)

Mechanisms of melt extraction during lower crustal partial melting

Journal of Metamorphic Geology, 2020
AbstractProgressive vapour‐absent partial melting of a closed rock system increases melt pressure due to an expansion in the volume of the mineral plus melt assemblage. For a locally closed system, we quantify the melt pressure increase per increment of partial melting of a metapelite using phase equilibria modelling and combine it with Mohr–Coulomb ...
Michael A. Etheridge, Nathan R. Daczko, Timothy Chapman, Catherine A. Stuart   +3 more
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Partial‐melt electrical conductivity: Influence of melt composition

Journal of Geophysical Research: Solid Earth, 1999
The electrical conductivity of a partial melt is influenced by many factors, including melt conductivity, crystalline conductivity, and melt fraction, each of which is influenced by temperature. We have performed measurements of bulk conductivity as a function of temperature of an Fo80‐basalt partial melt between 684° and 1244°C at controlled oxygen ...
Jeffery J. Roberts, James A. Tyburczy
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Partial melting, partial melt extraction and partial back reaction in anatectic migmatites

Lithos, 2001
Abstract Anatectic migmatites commonly show both prograde (entropy producing) and retrograde reactions between minerals and melt. The final textures, mineral modes and mineral chemistries are affected by four successive processes: (i) prograde partial melting and small-scale segregation into melt-rich domains and restitic domains; (ii) partial melt ...
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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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Underplating and Partial Melting: Implications for Melt Generation and Extraction

Science, 1989
The quantitative assessment of underplating and concomitant partial melting of continental crust requires the use of geologically reasonable melt fraction distributions as a function of temperature. Conductive modeling indicates that simple underplating of metapelite by basalt can yield magma bodies with melt fractions above the rheological limit of ...
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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

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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