Results 191 to 200 of about 92,567 (225)

Deformation driven magma ascent in stratified magma reservoirs: an experimental study

2021
<p>Mature volcanic systems (e.g., Yellowstone, USA; Campi Flegrei, Italy) are fed by stratified magma reservoirs – small bodies of eruptible, crystal-poor silicic magma are suspended within a larger volume of non-eruptible, crystal-rich mush.
Amy Ryan, Mark Zimmerman, Lars Hansen
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Magma Ascent and the Pressurization of Mount Etna's Volcanic System

Science, 2003
After a period of deflation during the 1991–1993 flank eruption, Mount Etna underwent a rapid inflation. Seismicity and ground deformation show that since 1994, a huge volume of magma intruded beneath the volcano, producing from 1998 onward a series of eruptions at the summit and on the flank of the volcano.
Domenico, Patanè, Pasquale, De Gori, Claudio, Chiarabba, Alessandro, Bonaccorso   +3 more
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Magma Ascent in Conduits

2001
Intrusion of magma through crustal rock takes place along various types of conduits which are connected to magma reservoirs or magma supply networks of volcanic systems. Elastic stresses play a role in magma propagation only near the tips of fractures where the stress concentrations are high (Section 5.2.2).
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Decompression experiments as an insight into ascent rates of silicic magmas

Contributions to Mineralogy and Petrology, 2003
An experimental study of H2O exsolution, bubble growth and microlite crystallisation during ascent (decompression) of silicic magmas in the volcanic conduit is presented. Isobaric and decompression experiments were performed on a rhyolitic melt at 860 °C, NNO+1, H2O saturation, and pressures between 15 and 170 MPa. Two sets of decompression experiments
Martel, Caroline, Schmidt, Burkhard C.
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The influence of geometry on the ascent of magma in open fissures

Bulletin of Volcanology, 1990
During steady eruption, the flow conditions (emitted mass flux, exit velocity and exit pressure) depend on the geometry of the conduit in which the eruption occurs. This dependence is examined for the onedimensional, isothermal ascent of a homogeneous basaltic magma with an aqueous volatile phase and newtonian rheology.
Giberti, G., Wilson, L.
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Degassing of rhyolitic magma during ascent and emplacement

Journal of Geophysical Research: Solid Earth, 1988
The degassing history of a rhyolitic igneous system was documented from analyses of drill core samples through the extrusive and intrusive portions of Obsidian Dome and of surface samples of associated tephra. The initial volatile composition of the Inyo magma was estimated to be 4.0 wt % H2O, 500 ppm F, 800 ppm Cl, and 80 ppm S.
H. R. Westrich, H. W. Stockman, J. C. Eichelberger   +2 more
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The nature, ascent and emplacement of granitic magmas

Journal of the Geological Society, 1979
The address is a wide-ranging commentary on the physical aspects of granitic magma and deals especially with the mode of emplacement. Recommendations on the nomenclature of plutons and batholiths involve both a description of the actual shape and their modeling by experimental and salt-diapir analogues. The nature of granitic crystal-mushes, wet or dry,
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An empirical scaling of shear-induced outgassing during magma ascent: Intermittent magma ascent causes effective outgassing

Earth and Planetary Science Letters, 2012
Abstract Outgassing, which changes the distribution of volcanic gases in magmas, is one of the most important processes to determine the eruption styles. Shear deformation of ascending bubbly magmas at the vicinity of the volcanic conduit wall has been considered as an efficient mechanism of outgassing.
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Two-dimensional simulations of magma ascent in volcanic conduits

International Journal for Numerical Methods in Fluids, 1999
Summary: We present a two-dimensional model for magma ascent in volcanic conduits. The model accounts for magma rheology, heat flux to the surrounding country rock, planar and axisymmetric geometries, and for the flow in mushy region by means of a continuum mixture formulation that does not require to track the liquid-solid interface.
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Ascent and eruption of basaltic magma on the Earth and Moon

Journal of Geophysical Research: Solid Earth, 1981
Geological and physical observations and constraints are applied to the development of a model of the ascent and emplacement of basaltic magma on the earth and moon. Mathematical models of the nature and motion of gas/liquid mixtures are developed and show that gas exsolution from terrestrial and lunar magmas commonly only occurs at shallow depths ...
Wilson, L., Head, James W.
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