The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks

The present study is based on a series of two-dimensional simple shear numerical simulations of two-phase non-linear viscous materials used to investigate the mechanical behaviour of two-phase aggregates representing partially molten rocks. These simulations couple viscoplastic deformation with dyna...

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Authors: Llorens, Maria-Gema, Gómez Rivas, Enrique, Ganzhorn, A.-C., Griera i Artigas, Albert, Steinbach, F., Roessiger, J., Labrousse, L., Walte, N., Weikusat, I., Bons, Paul D.
Format: article
Status:Versión aceptada para publicación
Publication Date:2018
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/162485
Online Access:https://hdl.handle.net/2445/162485
Access Level:Open access
Keyword:Cristal·lització
Reologia
Microestructura
Crystallization
Rheology
Microstructure
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spelling The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocksLlorens, Maria-GemaGómez Rivas, EnriqueGanzhorn, A.-C.Griera i Artigas, AlbertSteinbach, F.Roessiger, J.Labrousse, L.Walte, N.Weikusat, I.Bons, Paul D.Cristal·litzacióReologiaMicroestructuraCrystallizationRheologyMicrostructureThe present study is based on a series of two-dimensional simple shear numerical simulations of two-phase non-linear viscous materials used to investigate the mechanical behaviour of two-phase aggregates representing partially molten rocks. These simulations couple viscoplastic deformation with dynamic recrystallisation (DRX). The aim of these simulations is to investigate the competition between deformation and recrystallisation, and how they affect the mechanical behaviour and resulting microstructures of the deforming material. We systematically vary the melt to solid rock ratio, the dihedral angle of melt and the ratio of DRX vs. deformation. The results show that the amount of DRX and the dihedral angle have a first-order impact on the bulk rheology and the melt distribution in the aggregate. The numerical results allow defining two regimes, depending on the relative contribution of deformation and DRX: (1) a deformation-dominated regime at high strain rates (i.e., with a low ratio of recrystallisation vs. viscoplastic deformation) and (2) a recrystallisation-dominated regime at low strain rates (i.e., with a high ratio of recrystallisation vs. viscoplastic deformation). The first case results in systems bearing large connected melt pockets whose viscous flow controls the deformation of the aggregate, while disconnected smaller melt pockets develop in models where dynamic recrystallisation dominates. The results of this study allow us to better understand the development of connected melt pockets, which may focus melt flow. The distribution of the melt phase plays a key role in the formation of larger-scale melt-enriched shear bands, which in turn has a direct influence on large-scale convective mantle flow.Elsevier Ltd2020202020182020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion24 p.application/pdfhttps://hdl.handle.net/2445/162485Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jsg.2018.10.013Journal of Structural Geology, 2018, vol. 118, p. 223-235https://doi.org/10.1016/j.jsg.2018.10.013cc-by-nc-nd (c) Elsevier Ltd, 2018http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1624852026-05-29T05:05:01Z
dc.title.none.fl_str_mv The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
title The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
spellingShingle The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
Llorens, Maria-Gema
Cristal·lització
Reologia
Microestructura
Crystallization
Rheology
Microstructure
title_short The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
title_full The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
title_fullStr The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
title_full_unstemmed The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
title_sort The effect of dynamic recrystallisation on the rheology and microstructures of partially molten rocks
dc.creator.none.fl_str_mv Llorens, Maria-Gema
Gómez Rivas, Enrique
Ganzhorn, A.-C.
Griera i Artigas, Albert
Steinbach, F.
Roessiger, J.
Labrousse, L.
Walte, N.
Weikusat, I.
Bons, Paul D.
author Llorens, Maria-Gema
author_facet Llorens, Maria-Gema
Gómez Rivas, Enrique
Ganzhorn, A.-C.
Griera i Artigas, Albert
Steinbach, F.
Roessiger, J.
Labrousse, L.
Walte, N.
Weikusat, I.
Bons, Paul D.
author_role author
author2 Gómez Rivas, Enrique
Ganzhorn, A.-C.
Griera i Artigas, Albert
Steinbach, F.
Roessiger, J.
Labrousse, L.
Walte, N.
Weikusat, I.
Bons, Paul D.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Cristal·lització
Reologia
Microestructura
Crystallization
Rheology
Microstructure
topic Cristal·lització
Reologia
Microestructura
Crystallization
Rheology
Microstructure
description The present study is based on a series of two-dimensional simple shear numerical simulations of two-phase non-linear viscous materials used to investigate the mechanical behaviour of two-phase aggregates representing partially molten rocks. These simulations couple viscoplastic deformation with dynamic recrystallisation (DRX). The aim of these simulations is to investigate the competition between deformation and recrystallisation, and how they affect the mechanical behaviour and resulting microstructures of the deforming material. We systematically vary the melt to solid rock ratio, the dihedral angle of melt and the ratio of DRX vs. deformation. The results show that the amount of DRX and the dihedral angle have a first-order impact on the bulk rheology and the melt distribution in the aggregate. The numerical results allow defining two regimes, depending on the relative contribution of deformation and DRX: (1) a deformation-dominated regime at high strain rates (i.e., with a low ratio of recrystallisation vs. viscoplastic deformation) and (2) a recrystallisation-dominated regime at low strain rates (i.e., with a high ratio of recrystallisation vs. viscoplastic deformation). The first case results in systems bearing large connected melt pockets whose viscous flow controls the deformation of the aggregate, while disconnected smaller melt pockets develop in models where dynamic recrystallisation dominates. The results of this study allow us to better understand the development of connected melt pockets, which may focus melt flow. The distribution of the melt phase plays a key role in the formation of larger-scale melt-enriched shear bands, which in turn has a direct influence on large-scale convective mantle flow.
publishDate 2018
dc.date.none.fl_str_mv 2018
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/162485
url https://hdl.handle.net/2445/162485
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.jsg.2018.10.013
Journal of Structural Geology, 2018, vol. 118, p. 223-235
https://doi.org/10.1016/j.jsg.2018.10.013
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier Ltd, 2018
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier Ltd, 2018
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 24 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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