Results 181 to 190 of about 92,567 (225)
Regional controls on magma ascent and storage in volcanic arcs
Geochemistry, Geophysics, Geosystems, 2014 Understanding the controls for magma ascent and storage depth is important for volcanic hazard assessment. Regional differences in the depths of magma storage between volcanic arcs suggest that the settings of subduction zones and of overriding plates ...
Estelle Chaussard, Falk Amelung
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Understanding which parameters control shallow ascent of silicic effusive magma [PDF]
Geochemistry, Geophysics, Geosystems, 2014 The estimation of the magma ascent rate is key to predicting volcanic activity and relies on the understanding of how strongly the ascent rate is controlled by different magmatic parameters. Linking potential changes of such parameters to monitoring data
Jürgen Neuberg, Mark E Thomas
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Ascent of magma in a deformable vent
Journal of Geophysical Research: Solid Earth, 1986The ascent of magma in a deformable cylindrical vent is analyzed to reveal the character and extent of mechanical disturbances in vent geometry and associated effects on the magma ascent process. Both magma and surrounding country rock are assumed to behave as Newtonian fluids.
Yoshiaki Ida, Mineo Kumazawa
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The ascent of felsic magmas in dykes
Lithos, 1994Abstract The results of a thermal and fluid-dynamical analysis are presented that allow geologists to estimate the critical dyke or fracture width ( w c ) necessary for the transport of felsic magma through the crust without control by solidification.
Nick Petford +2 more
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Formation and ascent of granitic magmas
Geologische Rundschau, 1991New results obtained by the investigation of liquidus and solidus phase relationships in the haplogranite system Qz-Ab-Or are used to discuss the evolution of magmas during their ascent in the crust. It is assumed that the magmas are formed at 720°C, 820°C, 920°C and at a depth corresponding to a pressure of 8 kbar.
Johannes, Wilhelm, Holtz, François
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Modelling the ascent of picritic lunar magmas
2021<p>Quantifying the volatile content of the lunar interior is valuable for understanding the formation, thermal evolution, and magmatic evolution of the Earth and Moon. Petrological modelling and geochemical measurements have been used to study the volatile composition of the lunar interior.
Marissa Lo +4 more
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Stepwise accumulation and ascent of magmas
Journal of Metamorphic Geology, 2001AbstractOne of the currently popular theories on magma ascent is that it mainly occurs by propagating hydrofractures (dykes) and that magma viscosity is the primary rate‐controlling factor. This theory is based on mathematical models for single hydrofractures under idealised conditions.
Bons, Paul D. +2 more
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Coupling magma ascent models with volatile diffusion chronometry
Earth and Planetary Science LettersInternational audienceOne of the biggest challenges in volcanology is assessing the role of magma properties (volatile budgets, storage depths, and ascent rates) in controlling eruption explosivity.
Fidel Costa, Olivier Bernard
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Reviews in Mineralogy and Geochemistry, 2008
Volcanoes can erupt explosively, generating high columns of ash and occasional pyroclastic flows, or they can erupt slowly forming lava flows and domes. This variation reflects significant differences in mass eruption rate (e.g., Wilson et al. 1980). Mass eruption rates in turn are controlled by the rates of magma ascent through the volcanic conduit ...
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Volcanoes can erupt explosively, generating high columns of ash and occasional pyroclastic flows, or they can erupt slowly forming lava flows and domes. This variation reflects significant differences in mass eruption rate (e.g., Wilson et al. 1980). Mass eruption rates in turn are controlled by the rates of magma ascent through the volcanic conduit ...
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Analogue modelling of segregation and ascent of magma
Journal of the Virtual Explorer, 2001Paul D. Bons, Marlina A.
Bons, Paul D. +2 more
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