Late cenozoic tectonics and paleomagnetism of North Cauca Basin intrusions, Colombian Andes: Dual rotation modes

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dc.citation.journalTitleTectonophysics
dc.contributor.authorMacDonald, WD
dc.contributor.authorEstrada, JJ
dc.contributor.authorSierra, GM
dc.contributor.authorGonzalez, H
dc.contributor.departmentUniversidad EAFIT. Departamento de Cienciasspa
dc.contributor.researchgroupGeología Ambiental y Tectónicaspa
dc.creatorMacDonald, WD
dc.creatorEstrada, JJ
dc.creatorSierra, GM
dc.creatorGonzalez, H
dc.date.accessioned2021-03-26T21:25:55Z
dc.date.available2021-03-26T21:25:55Z
dc.date.issued1996-09-15
dc.description.abstractFurther paleomagnetic results are reported from 18 sites in Late Tertiary hypabyssal igneous rocks adjacent to the Romeral fault system which forms the eastern boundary of the North Cauca Basin. The paleomagnetic directions in these massive igneous intrusions are distributed in vertical planes parallel to the adjacent Romeral suture zone. Two modes of rotation, involving non-coherent rotations about horizontal rotation axes and coherent rotations about vertical rotation axes, can explain the observed remanence patterns. The paleovectors have been rotated variably (non-coherently), both upwards and downwards, through up to nearly 90°, about horizontal axes which are perpendicular to the prevailing structural trend. These horizontal axis rotations are believed to be associated with shear gradients operating on rough projections or "asperities" on otherwise approximately lenticular bodies. These give rise to torques which cause variable horizontal axis rotation along splay faults of the Romeral and adjacent systems. In addition, the north segment of the zone of intrusions has been rotated coherently, i.e. through uniform angles, of about 30° counterclockwise, about vertical axes relative to the southern zone. The change in declination trend corresponds to a major change in trend of the Romeral suture zone. The vertical-axis rotations are believed to represent regional-scale kinking of vertical lenti-laminar fault panels of crust accreted to the paleocontinental margin along the Romeral suture. It is hypothesized that oblique transpression has pressed the zone of intrusions into the Caldas Re-entrant in the paleocontinental margin.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1526
dc.identifier.doi10.1016/0040-1951(95)00184-0
dc.identifier.issn00401951
dc.identifier.issn18793266
dc.identifier.otherWOS;A1996VQ39000003
dc.identifier.otherSCOPUS;2-s2.0-0030423466
dc.identifier.urihttp://hdl.handle.net/10784/27225
dc.languageeng
dc.language.isoengeng
dc.publisherELSEVIER SCIENCE BV
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0030423466&doi=10.1016%2f0040-1951%2895%2900184-0&partnerID=40&md5=99ecd624e4d5ca047af57a9daa772f14
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0040-1951
dc.sourceTectonophysics
dc.subjectblock rotationeng
dc.subjectCainozoiceng
dc.subjectpalaeomagnetismeng
dc.subjecttectonicseng
dc.subjectColombia, Andes, North Cauca Basineng
dc.titleLate cenozoic tectonics and paleomagnetism of North Cauca Basin intrusions, Colombian Andes: Dual rotation modeseng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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