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Rheological changes in melts and magmas induced by crystallization and strain rate
Language
English
Obiettivo Specifico
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
S1/354 (2022)
ISSN
1631-0713
Publisher
Centre Mersenne pour l’édition scientifique ouverte
Pages (printed)
227-248
Issued date
2022
Abstract
This review highlights the rheological and phase proportions variation induced by cooling
events from superliquidus temperature (melt) to subliquidus temperatures. It provides a comprehensive view of the rheological response of magmatic systems undergoing dynamic cooling and shear
deformation. The two main parameters which are of importance to model the rheological properties
of such crystallizing systems and which are simultaneously poorly investigated so far are crystallization and strain rates. The response to relatively high deformation rates results in shear thinning behavior in partly crystallized systems under variable shear rate and it should be considered in magmatic processes. Due to the sluggish crystallization of SiO2-rich melts, data are mainly available for
mafic systems, which does not allow a general reappraisal. An attempt to model available literature
data for less evolved systems in dynamic scenarios and a comparison with MELTS algorithm approach
(thermodynamic equilibrium conditions) is provided. Since there are difficulties in comparing experimental data gained using different methodologies, we focus mainly on data obtained with the concentric cylinder technique. This highlights the fact that a general experimental protocol is needed in
order to compare and model viscosity data to predict the dynamic rheological evolution for volcanic
rocks.
events from superliquidus temperature (melt) to subliquidus temperatures. It provides a comprehensive view of the rheological response of magmatic systems undergoing dynamic cooling and shear
deformation. The two main parameters which are of importance to model the rheological properties
of such crystallizing systems and which are simultaneously poorly investigated so far are crystallization and strain rates. The response to relatively high deformation rates results in shear thinning behavior in partly crystallized systems under variable shear rate and it should be considered in magmatic processes. Due to the sluggish crystallization of SiO2-rich melts, data are mainly available for
mafic systems, which does not allow a general reappraisal. An attempt to model available literature
data for less evolved systems in dynamic scenarios and a comparison with MELTS algorithm approach
(thermodynamic equilibrium conditions) is provided. Since there are difficulties in comparing experimental data gained using different methodologies, we focus mainly on data obtained with the concentric cylinder technique. This highlights the fact that a general experimental protocol is needed in
order to compare and model viscosity data to predict the dynamic rheological evolution for volcanic
rocks.
Type
article
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CRGEOS_2022__354_S1_227_0.pdf
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Open Access published article
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