Structure and internal deformation of thrust sheets in the Sawtooth Range, Montana: insights from anisotropy of magnetic susceptibility

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dc.contributor.authorMcCarthy, Dave J.
dc.contributor.authorMeere, Patrick A.
dc.contributor.authorPetronis, Michael S.
dc.contributor.funderIrish Research Council for Science, Engineering and Technologyen
dc.date.accessioned2022-02-16T17:29:23Z
dc.date.available2022-02-16T17:29:23Z
dc.date.issued2020-01
dc.date.updated2022-02-16T17:15:06Z
dc.description.abstractGeological strain analysis of sedimentary rocks is commonly carried out using clast-based techniques. In the absence of valid strain markers, it can be difficult to identify the presence of an early tectonic fabric development and resulting layer parallel shortening (LPS). In order to identify early LPS, we carried out anisotropy of magnetic susceptibility (AMS) analyses on Mississippian limestones from the Sawtooth Range of Montana. The Sawtooth Range is an arcuate zone of north-trending, closely spaced, west-dipping, imbricate thrust sheets that place Mississippian Madison Group carbonates above Cretaceous shales and sandstones. This structural regime is part of the cordilleran mountain belt of North America, which resulted from accretion of allochthonous terrains to the western edge of the North American continent.Although the region has a general east-west increase in thrust displacement and related brittle deformation, a similar trend in penetrative deformation or the distribution of tectonic fabrics is not observed in the field or in the AMS results. The range of magnetic fabrics identified in each thrust sheet ranges from bedding controlled depositional fabrics to tectonic fabrics at a high angle to bedding.en
dc.description.sponsorshipIrish Research Council for Science, Engineering and Technology (Embark scholarship)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMcCarthy, D. J., Meere, P. A. and Petronis, M. S. (2020) 'Structure and internal deformation of thrust sheets in the Sawtooth Range, Montana: insights from anisotropy of magnetic susceptibility', in Bond, C. E. and Lebit, H. D. (eds.) Folding and Fracturing of Rocks: 50 Years of Research since the Seminal Text Book of J. G. Ramsay. Geological Society, London, Special Publications, 487, pp. 189-208. doi: 10.1144/SP487.6en
dc.identifier.doi10.1144/SP487.6en
dc.identifier.endpage208en
dc.identifier.isbn9781786204295
dc.identifier.isbn9781786204721
dc.identifier.issn0305-8719
dc.identifier.journaltitleGeological Society, London, Special Publicationsen
dc.identifier.startpage189en
dc.identifier.urihttps://hdl.handle.net/10468/12577
dc.identifier.volume487en
dc.language.isoenen
dc.publisherGeological Society of Londonen
dc.relation.ispartofFolding and Fracturing of Rocks: 50 Years of Research since the Seminal Text Book of J. G. Ramsay
dc.relation.urihttps://sp.lyellcollection.org/content/487/1/189
dc.rights© 2020, Geological Society of London.en
dc.subjectRegional structureen
dc.subjectKinematic historyen
dc.subjectStrain variationen
dc.subjectRocky Mountainsen
dc.subjectWyoming Salienten
dc.subjectDisturbed belten
dc.subjectFinite strainen
dc.subjectFabricsen
dc.subjectForelanden
dc.subjectAMSen
dc.subjectTectonic fabricsen
dc.subjectSawtooth Rangeen
dc.subjectSevier fold and thrust belten
dc.titleStructure and internal deformation of thrust sheets in the Sawtooth Range, Montana: insights from anisotropy of magnetic susceptibilityen
dc.typeBook chapteren
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