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dc.contributor.author
Tokle, Leif
dc.contributor.author
Hirth, Greg
dc.date.accessioned
2021-07-29T14:28:44Z
dc.date.available
2021-07-29T14:25:06Z
dc.date.available
2021-07-29T14:28:44Z
dc.date.issued
2021-07
dc.identifier.issn
2169-9313
dc.identifier.issn
0148-0227
dc.identifier.issn
2169-9356
dc.identifier.other
10.1029/2020jb021475
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/498449
dc.identifier.doi
10.3929/ethz-b-000498449
dc.description.abstract
Relationships between the recrystallized grain size and stress are investigated for experimentally deformed water-added quartz aggregates. For stresses ≥100 MPa there is a variation in the measured recrystallized grain size for a given stress. This variation correlates with a change in the c-axis fabric in general shear experiments, where samples with larger recrystallized grain sizes for a given stress have dominantly prism <a> c-axis fabrics and samples with smaller recrystallized grain sizes for a given stress have dominantly basal <a> c-axis fabrics. The dislocation creep flow law also changes at conditions where these two c-axis fabrics form (Tokle et al., 2019, https://doi.org/10.1016/j.epsl.2018.10.017). Using the wattmeter model (Austin & Evans, 2007, https://doi.org/10.1130/G23244A.1), different piezometric relationships are quantified for samples that develop prism <a> and basal <a> c-axis fabrics, respectively. The wattmeter model is sensitive to grain growth kinetics; a new grain growth law for quartz is formulated based on reanalysis of microstructures in samples from previous work. The activation enthalpies and water fugacity exponents for our grain growth law and dislocation creep flow laws are the same within error, suggesting the recrystallized grain size versus stress relationships are nearly independent of temperature and water fugacity, consistent with laboratory observations. The wattmeters successfully predict the recrystallized grain size versus stress relationships of all quartzite samples from experiments with added water. These results support the use and extrapolation of the wattmeter model for both experimental and geologic conditions to investigate the stress state and grain size evolution of quartz rich rocks.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/4.0/
dc.title
Assessment of Quartz Grain Growth and the Application of the Wattmeter to Predict Quartz Recrystallized Grain Sizes
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 4.0 International
dc.date.published
2021-06-13
ethz.journal.title
Journal of Geophysical Research: Solid Earth
ethz.journal.volume
126
en_US
ethz.journal.issue
7
en_US
ethz.journal.abbreviated
J. geophys. res. Solid earth
ethz.pages.start
e2020JB021475
en_US
ethz.size
21 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::09636 - Behr, Whitney / Behr, Whitney
en_US
ethz.relation.isSupplementedBy
10.3929/ethz-b-000473283
ethz.date.deposited
2021-07-29T14:25:15Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-07-29T14:28:53Z
ethz.rosetta.lastUpdated
2021-07-29T14:28:53Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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