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dc.contributor.authorPongrac, Petar
dc.contributor.authorJeřábek, Petr
dc.contributor.authorStunitz, Holger
dc.contributor.authorRaimbourg, Hugues
dc.contributor.authorRacek, Martin
dc.contributor.authorJollands, Michael C.
dc.contributor.authorGies, Nils
dc.contributor.authorLueder, Mona
dc.contributor.authorLexa, Ondrej
dc.contributor.authorNègre, Lucille
dc.date.accessioned2024-10-02T10:27:28Z
dc.date.available2024-10-02T10:27:28Z
dc.date.issued2024-07-31
dc.description.abstractIn order to identify relations between mechanical behavior, deformation mechanisms, microstructural properties, and H<sub>2</sub>O distribution, Tana‐quartzite samples with added H<sub>2</sub>O ranging from 0 to 0.5 wt.% were deformed by axial shortening at constant displacement rates, at 900°C and 1 GPa, reaching up to ∼30% bulk strain. Samples with lower quantities of added H<sub>2</sub>O (0.1 and 0.2 wt.%) were in average ∼30 MPa weaker than the as‐is samples with no added H<sub>2</sub>O. In contrast, samples with more than 0.2 wt.% added H<sub>2</sub>O revealed more variable mechanical behavior, showing either weaker or stronger trend. The weaker samples showed strain localization in their central parts in the vicinity of the thermocouple, that is, the hottest parts of the samples, whereas the stronger samples showed localization in their upper, slightly colder parts. Bulk deformation is accommodated by crystal plasticity and dissolution‐precipitation processes. Distribution of H<sub>2</sub>O in our samples revealed systematic decrease of H<sub>2</sub>O content in the interiors of original grains, caused by increasing strain and H<sub>2</sub>O draining into grain boundary regions. With increasing content of added H<sub>2</sub>O, the quartz recrystallization gradually changes from subgrain‐rotation‐dominated to crack‐induced nucleation, along with increasing quantity of melt/fluid pockets. The unexpected strain localization in the upper parts of stronger samples most likely results from mode‐1‐cracking that led to drainage of grain boundaries (GB) due to the crack dilatancy effect, and inhibited dissolution‐precipitation in the hottest part of the samples next to the thermocouple. The locus of deformation isthen shifted to colder regions where more H<sub>2</sub>O is available along GB.en_US
dc.identifier.citationPongrac P, Jeřábek P, Stunitz H, Raimbourg H, Racek M, Jollands, Gies N, Lueder, Lexa O, Nègre L. Mechanical Impact of Heterogeneously Distributed H<sub>2</sub>O on Quartz Deformation. Journal of Geophysical Research (JGR): Solid Earth. 2024;198(8)en_US
dc.identifier.cristinIDFRIDAID 2284673
dc.identifier.doi10.1029/2023JB027566
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.urihttps://hdl.handle.net/10037/34967
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalJournal of Geophysical Research (JGR): Solid Earth
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleMechanical Impact of Heterogeneously Distributed H2O on Quartz Deformationen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)