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dc.date.accessioned2018-09-13T12:39:02Z
dc.date.available2019-07-04T22:46:59Z
dc.date.created2018-01-25T15:05:43Z
dc.date.issued2017
dc.identifier.citationAdamuszek, Marta Dabrowski, Marcin . Sheath folds as a strain gauge in simple shear. Journal of Structural Geology. 2017, 102, 21-36
dc.identifier.urihttp://hdl.handle.net/10852/64709
dc.description.abstractWe investigate initiation and evolution of sheath folds developing in multilayer sequences around slip surfaces in simple shear. The slip surface is initially circular and oriented at 135° to the shearing direction. The flow perturbation around the rotating and deforming slip surface initiates the growth of deflections of the layers, which serves as precursors for the sheath structure. The influence of the perturbed flow on the fold growth decreases with strain as the structure is moved away from the slip surface. For γ > 10, the sheath fold evolution is dominated by a passive simple shear. We describe the fold geometry using: 1) interlimb angle (α), 2) apical angle (β), and 3) aspect ratio of the eye-structures in the section normal to the shearing direction at the fold base (Ryz). We show that the fold shapes developing in different interfaces can be characterized by a unique combination of the three parameters depending on strain magnitude. We present three strain gauge diagrams, which can be used to decipher strain from sheath folds based on any combination of two out of three parameters (α, β, Ryz). We approximate the late evolution of the modelled sheath folds by analysing the passive deformation of cone structures in simple shear. We show that Ryz is asymptotically proportional to the square root of strain magnitude.en_US
dc.languageEN
dc.publisherPergamon Press
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleSheath folds as a strain gauge in simple shearen_US
dc.typeJournal articleen_US
dc.creator.authorAdamuszek, Marta
dc.creator.authorDabrowski, Marcin
cristin.unitcode185,15,22,20
cristin.unitnameGEO Physics of Geological processes
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.cristin1551999
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Structural Geology&rft.volume=102&rft.spage=21&rft.date=2017
dc.identifier.jtitleJournal of Structural Geology
dc.identifier.volume102
dc.identifier.startpage21
dc.identifier.endpage36
dc.identifier.doihttp://dx.doi.org/10.1016/j.jsg.2017.06.008
dc.identifier.urnURN:NBN:no-67241
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0191-8141
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/64709/1/manuscript_revised_with_figures.pdf
dc.type.versionAcceptedVersion


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