Comparison of brittle- and viscous creep in quartzites: Implications for semi-brittle flow of rocks

dc.contributor.author Reber, Jacqueline
dc.contributor.author Pec, Matej
dc.contributor.author Reber, Jacqueline
dc.contributor.department Geological and Atmospheric Sciences
dc.date 2018-06-18T21:53:30.000
dc.date.accessioned 2020-06-30T04:04:17Z
dc.date.available 2020-06-30T04:04:17Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2018
dc.date.embargo 2019-05-29
dc.date.issued 2018-01-01
dc.description.abstract <p>The co-existence and interaction between brittle and viscous deformation processes contributes to the integrated strength of the crust and results in a wide range of energy-release mechanisms ranging from earthquakes to creep. Here, we compare flow laws derived for quartz-rich rocks deforming by brittle creep, wet dislocation power-law creep and dissolution-precipitation creep. We investigate theoretically the conditions when both brittle and viscous processes contribute significantly to deformation provided that all processes act independently and in parallel. Utilizing a comprehensive data set for deformation experiments in quartz-rich rocks, we find that the transition between deformation mechanisms is strongly dependent on input variables such as initial flaw size and grain size. The transition can occur abruptly or over hundreds of MPa in differential stress and hundreds of degrees Kelvin at a constant strain rate. The transition is strongly dependent on grain-size and confining pressure. Limitations to this work are first that all three flow laws are poorly constrained by experimental data for conditions relevant for the comparison. Secondly, a need exists for new experiments to infill the knowledge gaps between high-temperature and low-temperature deformation experiments and deriving quantitative flow laws for low-temperature plasticity and high-temperature brittle creep.</p>
dc.description.comments <p>This is a manuscript of an article published as Reber, Jacqueline E., and Matej Pec. "Comparison of brittle-and viscous creep in quartzites: Implications for semi-brittle flow of rocks." 113 <em>Journal of Structural Geology</em> (2018): 90-99. DOI: <a href="http://dx.doi.org/10.1016/j.jsg.2018.05.022" target="_blank">10.1016/j.jsg.2018.05.022</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ge_at_pubs/253/
dc.identifier.articleid 1262
dc.identifier.contextkey 12245424
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ge_at_pubs/253
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/38196
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ge_at_pubs/253/2018_Reber_ComparisonBrittle.pdf|||Fri Jan 14 22:58:08 UTC 2022
dc.source.uri 10.1016/j.jsg.2018.05.022
dc.subject.disciplines Earth Sciences
dc.subject.disciplines Geology
dc.subject.disciplines Tectonics and Structure
dc.title Comparison of brittle- and viscous creep in quartzites: Implications for semi-brittle flow of rocks
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5ee7cf94-4acc-41e7-b521-585d50f69510
relation.isOrgUnitOfPublication 29272786-4c4a-4d63-98d6-e7b6d6730c45
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