Late Cretaceous–early Eocene counterclockwise rotation of the Fueguian Andes and evolution of the Patagonia–Antarctic Peninsula system

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dc.contributor.authorPoblete, F.
dc.contributor.authorRoperch, P.
dc.contributor.authorArriagada, C.
dc.contributor.authorRuffet, G.
dc.contributor.authorRamírez de Arellano, C.
dc.contributor.authorHervé, F.
dc.contributor.authorPoujol, M.
dc.date.accessioned2023-11-21T18:56:42Z
dc.date.available2023-11-21T18:56:42Z
dc.date.issued2016-02
dc.descriptionIndexación: Scopus.es
dc.description.abstractThe southernmost Andes of Patagonia and Tierra del Fuego present a prominent arc-shaped structure: the Patagonian Bend. Whether the bending is a primary curvature or an orocline is still matter of controversy. New pa leomagnetic data have been obtained south of the Beagle Channel in 39 out of 61 sites. They have been drilled in Late Jurassic and Early Cretaceous sediments and interbedded volcanics and in mid-Cretaceous to Eocene intrusives of the Fuegian Batholith. The anisotropy of magnetic susceptibility was measured at each site and the influence of mag netic fabric on the characteristic remanent magnetizations (ChRM) in plutonic rocks was corrected using inverse tensors of anisotropy of remanent magnetizations. Normal polarity secondary magnetizations with west-directed declination were obtained in the sediments and they did not pass the fold test. These characteristic directions are similar to those recorded by mid Cretaceous intrusives suggesting a remagnetization event during the normal Cre taceous superchron and describe a large (N90°) counterclockwise rotation. Late Cretaceous to Eocene rocks of the Fueguian Batholith, record decreasing counterclockwise rotations of 45° to 30°. These paleomagnetic results are interpreted as evidence of a large counterclockwise rotation of the Fueguian Andes related to the closure of the Rocas Verdes Basin and the formation of the Darwin Cordillera during the Late Cretaceous and Paleocene. The tectonic evolution of the Patagonian Bend can thus be described as the formation of a progressive arc from an oroclinal stage during the closure of the Rocas Verdes basin to a mainly primary arc during the final stages of deformation of the Magallanes fold and thrust belt. Plate reconstructions show that the Antarctic Peninsula would have formed a continuous margin with Patagonia between the Early Cretaceous and the Eocene, and acted as a non-rotational rigid block facilitating the development of the Patagonian Bend. © 2015 Elsevier B.V. All rights reserved.es
dc.description.urihttps://www-sciencedirect-com.recursosbiblioteca.unab.cl/science/article/pii/S004019511500654X?via%3Dihub
dc.identifier.citationTectonophysics. Volume 668-669, Pages 15 - 34. 8 February 2016es
dc.identifier.doi10.1016/j.tecto.2015.11.025
dc.identifier.issn0040-1951
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/54012
dc.language.isoenes
dc.publisherElsevier B.V.es
dc.subjectPatagonian Oroclinees
dc.subjectFuegian Andeses
dc.subjectAntarctic Peninsulaes
dc.subjectPaleomagnetismes
dc.subjectTectonicses
dc.subjectPlate tectonicses
dc.titleLate Cretaceous–early Eocene counterclockwise rotation of the Fueguian Andes and evolution of the Patagonia–Antarctic Peninsula systemes
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