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dc.contributor.authorSayab, Mohammad
dc.contributor.authorMiettinen, Arttu
dc.contributor.authorAerden, Domingo
dc.contributor.authorKarell, Fredrik
dc.date.accessioned2017-09-27T11:11:31Z
dc.date.available2019-10-01T21:35:43Z
dc.date.issued2017
dc.identifier.citationSayab, M., Miettinen, A., Aerden, D., & Karell, F. (2017). Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography. <i>Journal of Structural Geology</i>, <i>103</i>, 1-16. <a href="https://doi.org/10.1016/j.jsg.2017.09.002" target="_blank">https://doi.org/10.1016/j.jsg.2017.09.002</a>
dc.identifier.otherCONVID_27202451
dc.identifier.otherTUTKAID_74892
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/55465
dc.description.abstractWe applied X-ray computed microtomography (μ-CT) in combination with anisotropy of magnetic susceptibility (AMS) analysis to study metamorphic rock fabrics in an oriented drill core sample of pyrite-pyrrhotite-quartz-mica schist. The sample is extracted from the Paleoproterozoic Martimo metasedimentary belt of northern Finland. The μ-CT resolves the spatial distribution, shape and orientation of 25,920 pyrrhotite and 153 pyrite grains localized in mm-thick metapelitic laminae. Together with microstructural analysis, the μ-CT allows us to interpret the prolate symmetry of the AMS ellipsoid and its relationship to the deformation history. AMS of the sample is controlled by pyrrhotite porphyroblasts that grew syntectonically during D1 in subhorizontal microlithons. The short and intermediate axes (K3 and K2) of the AMS ellipsoid interchanged positions during a subsequent deformation (D2) that intensely crenulated S1 and deformed pyrrhotite, while the long axes (K1) maintained a constant position parallel to the maximum stretching direction. However, it is likely that all the three AMS axes switched, similar to the three principal axes of the shape ellipsoid of pyrite porphyroblasts from D1 to D2. The superposition of D1 and D2 produced a type-2 fold interference pattern.
dc.language.isoeng
dc.publisherPergamon Press
dc.relation.ispartofseriesJournal of Structural Geology
dc.subject.othermicrotomography
dc.subject.otherAMS
dc.subject.othermicrotectonics
dc.subject.othermagnetic fabric
dc.subject.otherpyrrhotite
dc.titleOrthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201709273844
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2017-09-27T06:15:38Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange1-16
dc.relation.issn0191-8141
dc.relation.numberinseries0
dc.relation.volume103
dc.type.versionacceptedVersion
dc.rights.copyright© 2017 Elsevier Ltd. This is a final draft version of an article whose final and definitive form has been published by Pergamon Press. Published in this repository with the kind permission of the publisher.
dc.rights.accesslevelopenAccessfi
dc.subject.ysorasitus
jyx.subject.urihttp://www.yso.fi/onto/yso/p23890
dc.relation.doi10.1016/j.jsg.2017.09.002


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