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dc.contributor.authorTokle, L.
dc.contributor.authorHirth, G.
dc.contributor.authorStunitz, Holger
dc.date.accessioned2023-04-11T11:34:03Z
dc.date.available2023-04-11T11:34:03Z
dc.date.issued2023-03-13
dc.description.abstractWe conducted general shear experiments on synthetic mixtures of quartz and muscovite aggregates at 800 °C and 1.5 GPa with 0.1 wt% H<sub>2</sub>O added in the Griggs apparatus to investigate the role of muscovite content on the microstructural evolution and rheological properties of quartz aggregates. Muscovite content varied between 0, 5, 10 and 25% muscovite. Mechanically, the sample strengths decrease with an increase in muscovite content. At high strains muscovite grains align sub-parallel to the shear plane with C′- bands commonly observed in the muscovite-bearing samples. The presence of muscovite has significant influence on the amount of dynamic recrystallization in quartz; at high strains the pure quartz sample completely recrystallizes while only ∼5% of the quartz in the 25% muscovite sample is dynamically recrystallized at similar strains. The presence of muscovite also has a significant influence on crystallographic preferred orientations (CPO) and grain shape preferred orientations (SPO) of quartz at high strains. At high strains, muscovite is interpretated to deform primarily by basal glide and dissolution-precipitation creep. Finally, our mechanical results fit well with rheological mixing models, where we estimate aggregates with 25% muscovite may deform 1–2 orders of magnitude faster than pure quartz aggregates at conditions near the brittle-ductile transition.en_US
dc.identifier.citationTokle, Hirth, Stunitz. The effect of muscovite on the microstructural evolution and rheology of quartzite in general shear. Journal of Structural Geology. 2023;169en_US
dc.identifier.cristinIDFRIDAID 2139039
dc.identifier.doi10.1016/j.jsg.2023.104835
dc.identifier.issn0191-8141
dc.identifier.issn1873-1201
dc.identifier.urihttps://hdl.handle.net/10037/28947
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalJournal of Structural Geology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 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.titleThe effect of muscovite on the microstructural evolution and rheology of quartzite in general shearen_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)