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dc.contributor.authorWiest, Johannes
dc.contributor.authorFossen, Haakon
dc.contributor.authorJacobs, Joachim
dc.date.accessioned2021-03-18T09:28:25Z
dc.date.available2021-03-18T09:28:25Z
dc.date.created2020-11-28T13:18:10Z
dc.date.issued2020
dc.identifier.issn0191-8141
dc.identifier.urihttps://hdl.handle.net/11250/2734088
dc.description.abstractThe formation of low-angle detachments involves exhumation of previously ductile material and fault zone weakening. To better understand this relationship, we studied a deeply eroded metamorphic core complex, which formed in the core of the Bergen Arcs (W Norway) during Caledonian post-orogenic collapse. Multi-scale structural mapping in the Øygarden Complex constrains three structural levels characterized by localized shear (Upper Unit), distributed deformation (Middle Unit) and a migmatite double-dome (Lower Unit). All levels show retrogressive E-W stretching accompanied by extension-parallel recumbent folding, albeit, with opposing shear senses at upper and middle/lower levels. The systematic comparison of 23 shear zones constrains the ductile-to-brittle structural evolution. Initially, high temperatures and partial melting controlled pervasive deep crustal flow and ductile doming. During retrogressive shearing, lithological heterogeneity controlled strain localization and channelized fluid flow causing retrograde phyllosilicate growth. This established a feedback loop of fluid-flow, fabric weakening and progressive shear localization. The interconnection of inherited and newly formed weak, phyllosilicate-rich layers promoted the formation of bivergent detachments that rapidly exhumed a dome of previously ductile crust. Retrogressive weakening in a kilometer-wide ductile-to-brittle ‘processing zone’ may be essential for the formation of continental detachments.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleShear zone evolution during core complex exhumation – Implications for continental detachmentsen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2020 The Authors.en_US
dc.source.articlenumber104139en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.1016/j.jsg.2020.104139
dc.identifier.cristin1853645
dc.source.journalJournal of Structural Geologyen_US
dc.identifier.citationJournal of Structural Geology. 2020, 140, 104139.en_US
dc.source.volume140en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal