Results 231 to 240 of about 10,162 (248)
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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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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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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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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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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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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.
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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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Crystal-mush compaction in the Cohassett flood-basalt flow, Hanford, Washington
Journal of Volcanology and Geothermal Research, 2005Abstract The 40-m-thick central part of the Cohassett flow, which was probably emplaced by inflation of an earlier more Ti-rich flow, exhibits textural evidence of crystal-mush compaction during solidification. Although most of the crystallization started in the roof zone as water circulated through fractures in the crust, plumes of dense crystal ...
Anthony R. Philpotts +1 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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Mixing between granitic and dioritic crystal mushes, Guernsey, Channel Islands, UK
Lithos, 1996Abstract The contact zone between the Cobo Granite and Bordeaux Diorite Complex of Guernsey (Channel Islands, UK) displays numerous features which result from the interaction of these two penecontemporaneously emplaced intermediate to felsic magmas. Initial interaction resulted in the formation of chilled mafic enclaves in granite magma.
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