Results 231 to 240 of about 921,071 (254)

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, Fabian B. Wadsworth, Katherine J. Dobson, Jérémie Vasseur, Jason P. Coumans   +4 more
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Origin of the Triassic Lincang granites in the southeastern Tibetan Plateau: Crystallization from crystal mush

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, Fu-Yuan Wu, Wen-Chang Li, Chuan-Long Mou, Xiao-Ming Huang, Bao-Di Wang, Fang-Yang Hu, Zhi-Min Peng   +7 more
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Crystal-mush compaction in the Cohassett flood-basalt flow, Hanford, Washington

Journal of Volcanology and Geothermal Research, 2005
Abstract 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
exaly   +2 more sources

Crystal rotation and growth during grain flow in a deforming crystal mush

1997
Crystal 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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Quantification of Flow Patterns in Sheared Tonalite Crystal-melt Mush

Journal of the Geological Society of India, 2010
Abstract 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, Jörn H. Kruhl, Alfredo Caggianelli   +2 more
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Consequences of crystal shape and fabric on anisotropic permeability in magmatic mush

Contributions to Mineralogy and Petrology, 2008
Crystals 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
openaire   +1 more source

Rheology of volatile-bearing crystal mushes: Mobilization vs. viscous death

Chemical Geology, 2013
Abstract 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, Caricchi, Luca, Ulmer, Peter, Reusser, Eric, Ardia, Paola   +4 more
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The origin and micromechanics of the preferential orientation of crystals in mush

Goldschmidt2023 abstracts, 2023
Alexandre Carrara, George Bergantz
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The crystal-scale characteristics of crystal mushes: crystal shape as a record of dynamic magmatic processes

All magmas transition through a crystal mush stage during solidification, and long-lived crystal mushes are thought to be common in crustal magmatic systems. The efficacy of many crystal mush processes depends primarily on the permeability and porosity of the mush, and thus on the shape and size of crystals in the mush framework.
Madeleine Humphreys, Amanda Lindoo, Richard Brooker, Eshbal Geifman, Charlotte Gordon, Ed Llewellin, Martin Mangler, Fabian Wadsworth   +7 more
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Continuous mixing of crystal mush and replenished magma in the ongoing Unzen eruption

Geology, 1995
Zoning profiles of magnetite phenocrysts in the successively effused dacite of the ongoing Unzen eruption from 1991 wereanalyzed to estimate the time scale of magma mixing. The dacite was formed by mixing of relatively high- and low-temperature ( T ) end-member magmas.
openaire   +1 more source