Vis enkel innførsel

dc.contributor.authorStunitz, Holger
dc.contributor.authorRaimbourg, H.
dc.contributor.authorNègre, L.
dc.contributor.authorPrécigout, J.
dc.contributor.authorJollands, M.
dc.contributor.authorPongrac, P.
dc.contributor.authorJeřabek, P.
dc.contributor.authorGies, N.
dc.contributor.authorLüder, M.
dc.description.abstractDeformation experiments were carried out on pure quartzite samples (>99% quartz) with a grain size of ∼200 μm from Tana, Northern Norway. Deformation conditions were 900 °C, 0.1 wt% H2O added, strain rate ∼1 × 10<sup>−6</sup> s<sup>−1</sup> at variable confining pressures from 600 to 2000 MPa. Detailed FTIR measurements of H<sub>2</sub>O indicate that the H<sub>2</sub>O content in the grain boundary region is higher than that inside quartz grains. Hydrostatic treatment and deformation at the chosen temperature and pressure conditions lead to further H<sub>2</sub>O loss from grain interiors and H<sub>2</sub>O increase in the grain boundary region. Varying the confining pressure does not have an observable effect on the H<sub>2</sub>O transfer from grains to the grain boundary region. The 3585 cm<sup>−1</sup> absorption band increases systematically with increasing confining pressure. As this band is associated with OH in dislocations, the increase may indicate an increased dislocation density with increasing pressure. The triplet of 3317, 3375 and 3438 cm<sup>−1</sup> associated with Al-content in quartz increases in the grain boundary region indicating an exchange of H<sup>+</sup> together with Al<sup>3+</sup> for Si4<sup>+</sup>. The Al and H exchange suggest dissolution-precipitation processes in the grain boundary region facilitating the movement of the quartz grain boundaries (grain boundary migration). The H2O in the grain boundary region will be important for enhancing grain boundary migration and thus recrystallization processes during deformationen_US
dc.identifier.citationStunitz, Raimbourg, Nègre, Précigout, Jollands, Pongrac, Jeřabek, Gies, Lüder. Evolution of H<inf>2</inf>O content in deforming quartz aggregates: An experimental study. Journal of Structural Geology. 2024;178en_US
dc.identifier.cristinIDFRIDAID 2242606
dc.relation.journalJournal of Structural Geology
dc.rights.holderCopyright 2024 The Author(s)en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleEvolution of H<inf>2</inf>O content in deforming quartz aggregates: An experimental studyen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US

Tilhørende fil(er)


Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel

Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)