Results 141 to 150 of about 2,155,550 (190)
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The transport of xenoliths in magmas
Earth and Planetary Science Letters, 1977Abstract Field measurements of the rheology of Hawaiian and Etnean lavas have shown that, on eruption, they behave as Bingham liquids with yield strengths in the range 70–450 N/m 2 . Ultramafic nodules entrained in a Bingham liquid cannot settle unless the stress they impose on the liquid exceeds approximately 5–7 times its yield strength ...
R.S.J. Sparks +2 more
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Dike transport of granitoid magmas
Geology, 1993Thermal and fluid-dynamical analyses suggest that for viscosities and density contrasts spanning the range considered typical for many calc-alkalic granitoids, dike ascent is a viable mechanism for the transport of large volumes of granitoid melt through the continental crust.
Nick Petford +2 more
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Illegitimate magmas of the Galápagos: Insights into mantle mixing and magma transport
Geology, 1999Roughly 1–2% of the flows erupted from flank vents of the western Galapagos shield volcanoes have anomalous compositions. We call these illegitimate magmas because of their uncertain parentage. Because some illegitimate magmas are compositionally indistinguishable from lavas of an adjacent volcano and erupt from the flank facing the adjacent volcano ...
Dennis Geist +3 more
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A reverse energy cascade for crustal magma transport
Nature Geoscience, 2017The controls on magma transport in the crust are poorly known. Field analysis and numerical modelling of magmatic intrusions preserved in North America suggest that surface transfer of magma increases in warming crust as the magmatic system ages.
Leif Karlstrom +2 more
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Logarithmic Schrödinger-like equation as a model for magma transport
Europhysics Letters (EPL), 2003We show that, under a suitable assumption on the pressure tensor, the mass and momentum balance equations of hydrodynamical theory, introduced in the early 1980s by many authors to describe matrix separation, yield the equations of the Madelung fluid that are equivalent to the Schrodinger-like equation with logarithmic nonlinearity.
DE MARTINO, Salvatore +3 more
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Granitic magma transport by fracture propagation
Tectonophysics, 1992Granitic magmas commonly ascend tens of kilometres from their source terranes to upper crustal emplacement levels, or to the Earth's surface. Apart from its obvious bearing on the interpretation of the geology and geochemistry of felsic igneous rocks, the magma ascent mechanism critically affects any modelling of the metamorphic evolution of the upper ...
J.D. Clemens, C.K. Mawer
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Granite magma formation, transport and emplacement in the Earth's crust
Nature, 2000The origin of granites was once a question solely for petrologists and geochemists. But in recent years a consensus has emerged that recognizes the essential role of deformation in the segregation, transport and emplacement of silica-rich melts in the continental crust.
N, Petford +3 more
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Lunar magma transport phenomena
Geochimica et Cosmochimica Acta, 1992An outline of magma transport theory relevant to the evolution of a possible Lunar Magma Ocean and the origin and transport history of the later phase of mare basaltic volcanism is presented. A simple model is proposed to evaluate the extent of fractionation as magma traverses the cold lunar lithosphere.
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Magma transport beneath mid-ocean ridges
2021<p>Melt transport beneath the lithosphere is elusive. With a distinct viscosity and density from the surrounding mantle, magmatic melt moves on a different time scale as the surrounding mantle. To resolve the temporal scale necessary to accurately capture melt transport in the mantle, the model simulations become numerically expensive ...
Shi Sim +3 more
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