Results 231 to 240 of about 1,472 (257)
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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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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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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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Quantification of Flow Patterns in Sheared Tonalite Crystal-melt Mush
Journal of the Geological Society of India, 2010Abstract Fractal-geometry-based analysis techniques offer simple and efficient ways for analyzing magmatic fabrics that are otherwise difficult to describe quantitatively. This study shows an application of two different methods on flow patterns observed in a syntectonic magmatic body injected into the lower crust. XZ and YZ rock cuts
Axel Gerik +2 more
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Lithos, 2020
Abstract The crustal generation of the Paleo-Tethys orogenic belt in the southeastern Tibetan Plateau is a major unresolved geological problem. The Changning-Menglian suture in the southeastern Tibetan Plateau represents a remnant of the Paleo-Tethys Ocean.
Feng Cong +7 more
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Abstract The crustal generation of the Paleo-Tethys orogenic belt in the southeastern Tibetan Plateau is a major unresolved geological problem. The Changning-Menglian suture in the southeastern Tibetan Plateau represents a remnant of the Paleo-Tethys Ocean.
Feng Cong +7 more
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The permeability of magma mush assembled from anisotropic tabular crystals
2021<p>The extraction of melt from a mush in a magma reservoir is of wide interest. All models for melt extraction from a mush require knowledge of mush permeability, and yet this remains poorly constrained. This permeability is typically calculated using the Kozeny-Carman model or variants thereof, which require a priori knowledge of the ...
Eloïse Bretagne +4 more
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Crystal rotation and growth during grain flow in a deforming crystal mush
1997Crystal motions during noncoaxial grain flow are described in an experimental ammonium-based polyphase crystal-melt system of low melt fraction (
Y. Park, W. D. Means
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Rheology of volatile-bearing crystal mushes: Mobilization vs. viscous death
Chemical Geology, 2013Abstract The rheology of volatile-bearing crystal mushes was constrained by deformation experiments on hydrous (2.52 wt.% H2O) haplogranitic magmas containing quartz crystals (solid fraction of 0.55 to 0.65) and gas-pressurized CO2-rich bubbles (bubble fraction of 0.09–0.10), under simple shear using a HT–HP Paterson-type rock deformation apparatus ...
Pistone, Mattia +4 more
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Consequences of crystal shape and fabric on anisotropic permeability in magmatic mush
Contributions to Mineralogy and Petrology, 2008Crystals that form an interconnected porous network can become preferentially oriented both prior to and during compaction of magmatic mush. This introduces anisotropy in the melt pore-space that can reduce permeability in the direction of compaction and in turn decrease melt flux and compaction rate. Using a number of grain-scale numerical models, the
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The origin and micromechanics of the preferential orientation of crystals in mush
Goldschmidt2023 abstracts, 2023Alexandre Carrara, George Bergantz
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