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dc.contributor.authorNègre, Lucille
dc.contributor.authorStunitz, Holger
dc.contributor.authorRaimbourg, Hugues
dc.contributor.authorLee, Amicia
dc.contributor.authorPrécigout, Jacques
dc.contributor.authorPongrac, Petar
dc.contributor.authorJeřábek, Petr
dc.date.accessioned2021-07-02T17:53:59Z
dc.date.available2021-07-02T17:53:59Z
dc.date.issued2021-04-17
dc.description.abstractQuartzite samples of high purity with a grain size of ~200 μm have been experimentally deformed by coaxial shortening in a solid medium apparatus at 900 °C and at confining pressures ranging from 0.6 to 2 GPa. Most samples have been shortened by ~30% with 0.1 wt% added H<sub>2</sub>O. The samples deformed dominantly by crystal plasticity (dislocation creep), and there is a systematic decrease of flow stress with increasing confining pressure. Strain rate stepping tests yield stress exponents of n ≈ 1.4. The strain determined from individual grain shapes matches that determined from bulk shortening. In addition to plastic strain, mode I cracks developed in all samples, principally in the grain boundary regions. Recrystallized material, visible through cathodoluminescence colours, forms by two mechanisms: (1) progressive subgrain rotation and (2) cracking, nucleating small new grains. After high-angle boundaries have been established, grain boundary migration takes place, and a distinction of new grains nucleation origin (subgrain rotation or cracking) is impossible. At higher pressure, there is more recrystallized material forming in the deformed samples, and it is inferred that the inverse pressure dependence of flow stress is caused by enhanced grain boundary migration at higher pressure, consistent with previous studies.en_US
dc.identifier.citationNègre, Stunitz H, Raimbourg H, Lee AL, Précigout J, Pongrac, Jeřábek P. Effect of pressure on the deformation of quartz aggregates in the presence of H2O . Journal of Structural Geology. 2021en_US
dc.identifier.cristinIDFRIDAID 1905983
dc.identifier.doi10.1016/j.jsg.2021.104351
dc.identifier.issn0191-8141
dc.identifier.issn1873-1201
dc.identifier.urihttps://hdl.handle.net/10037/21712
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalJournal of Structural Geology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy, petrology, geochemistry: 462en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi, petrologi, geokjemi: 462en_US
dc.titleEffect of pressure on the deformation of quartz aggregates in the presence of H2Oen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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