Results 221 to 230 of about 921,071 (254)
On the Mechanical Effects of Poroelastic Crystal Mush in Classical Magma Chamber Models [PDF]
Journal of Geophysical Research: Solid Earth, 2018 AbstractImproved constraints on the mechanical behavior of magma chambers is essential for understanding volcanic processes; however, the role of crystal mush on the mechanical evolution of magma chambers has not yet been systematically studied. Existing magma chamber models typically consider magma chambers to be isolated melt bodies surrounded by ...
Adam Soule, Yang Liao, Meghan Jones
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Timescales of storage and recycling of crystal mush at Krafla Volcano, Iceland [PDF]
Contributions To Mineralogy and Petrology, 2016 Processes in upper-crustal magma reservoirs such as recharge, magma mixing, recycling of previously crystallized material, and eruption affect both the physical state and the chemical composition of magmas. A growing body of evidence shows that crystals in intermediate or silicic volcanic rocks preserve records of these processes that may be obscured ...
Neil R Banerjee, Kari Cooper
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Direct observation of deformation processes in crystal mushes
Journal of Structural Geology, 1996Abstract Isothermal microstructural development in deforming, melt-bearing crystal mushes is studied using synkinematic microscopy and a polyphase, thiocyanate system. The aim of the work is to contribute to the basis for understanding the origin of microstructures in rocks which have undergone melt-present deformation.
Y. Park, W.D. Means
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Evaluation of crystal mush extraction models to explain crystal-poor rhyolites
Journal of Volcanology and Geothermal Research, 2014Abstract Mush models have become the new paradigm for explaining crystal-poor rhyolites in a variety of settings. Despite this general acceptance, there are cases where this model is problematic. Rhyolites from two specific areas are used to highlight examples where mush extraction models are inconsistent with erupted compositions.
Martin J Streck
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Lubrication effects on magmatic mush dynamics [PDF]
Journal of Volcanology and Geothermal Research, 2019 International audienceSilicic magma bodies are formed by repeated injections of mobile magma and reside as a crystal-rich mush. Numerical studies of open-system events have revealed the complexity of mixing and rheological behavior.
Alexandre Carrara +2 more
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Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes [PDF]
American Mineralogist, 2017 Many plutons preserve evidence of magma mixing between hydrous mafic magmas and resident felsic crystal-rich mushes. To investigate water transfer processes in such systems following thermal equilibration, we conducted 24 h experiments to establish the ...
Jon Blundy, Mattia Pistone
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Zooming in on crystal mush: recent advances in volcano tomography
2021<p>The lack of direct seismological evidence for large molten magma chambers is considered to be one of the most important arguments in support of the mush paradigm. However, most published melt fraction estimates based on interpretation of seismological data are associated with large uncertainties because of two limitations: i) inherent ...
Michele Paulatto +7 more
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An experimental study of melt migration in crystal-rich mushes
2022<p>Increasingly, volcanologists model mature volcanic systems as being fed by stratified magma reservoirs, that is, small lenses of eruptible magma suspended within a larger volume of non-eruptible, crystal-rich mush. Erupted lavas record geochemical evidence for long-term deep storage of distinct magma bodies followed by their ascent and
Amy Ryan +3 more
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Bubble migration in a compacting crystal-liquid mush
Contributions to Mineralogy and Petrology, 2016Recent theoretical models have suggested that bubbles are unlikely to undergo significant migration in a compaction crystal mush by capillary invasion while the system remains partly molten. To test this, experiments of bubble migration during compaction in a crystal-liquid mush were modeled using deformable foam crystals in corn syrup in a volumetric ...
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Silicic magmas, crystal mushes, granitic plutons and rhyolitic eruptions
2023A crystallising magma must necessarily pass through a mushy (crystal-dominated) state before it fully solidifies. Similarly, partially melted magma source regions start out as solid-liquid mixtures, albeit with different initial conditions and physical behaviours to melt crystallisation.
John Clemens, Scott Bryan, Nick Petford
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