Results 251 to 260 of about 90,165 (312)

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 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 ...
Paul D. Asimow, Asimow, Paul D.
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Partial melting and melt migration in the acapulcoite-lodranite parent body [PDF]

Geochimica et Cosmochimica Acta, 1997
We review petrologic evidence that the acapulcoites and lodranites formed by < 1 vol% to probably 20 vol% whole rock partial melting of a chondritic precursor material. At low degrees of partial melting, only Fe,Ni---FeS cotectic melting occurred.
McCoy, Timothy J., Keil, K., Muenow, D. W., Wilson, L.   +3 more
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Partial melting in an upwelling mantle column

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2008
Decompression melting of hot upwelling rock in the mantle creates a region of partial melt comprising a porous solid matrix through which magma rises buoyantly.
Ian J Hewitt, A C Fowler
exaly   +3 more sources

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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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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 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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Partial melting and flow of orogens

Tectonophysics, 2001
Abstract A comparison of large orogenic belts formed at convergent plate boundaries indicates that orogenic evolution comprises a period of crustal thickening followed by the formation of a continental plateau and commonly syn- to post-convergence extension and thinning of the previously thickened crust.
Olivier Vanderhaeghe, Christian Teyssier
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