Results 301 to 310 of about 2,132,392 (379)

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 ...
Nathan R. Daczko, Nathan R. Daczko, Catherine A. Stuart, Michael A. Etheridge, Timothy Chapman, Timothy Chapman   +5 more
openaire   +3 more sources

Underplating and Partial Melting: Implications for Melt Generation and Extraction [PDF]

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 ...
openaire   +2 more sources

Sulfide partial melting and chalcopyrite disease: An experimental study

American Mineralogist, 2018
Speckling of sphalerite with micrometer-sized blebs of chalcopyrite is usually referred to as “chalcopyrite disease.” Fe-rich sphalerites are particularly prone to chalcopyrite disease.
Boddepalli Govindarao, K. Pruseth, B. Mishra   +2 more
semanticscholar   +1 more source

Partial melting in the upper mantle

Physics of the Earth and Planetary Interiors, 1970
The 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
openaire   +3 more sources

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
openaire   +2 more sources

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 ...
James A. Tyburczy, Jeffery J. Roberts
openaire   +2 more sources

Partial melting and melt migration in the acapulcoite-lodranite parent body

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, 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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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
openaire   +2 more sources