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dc.contributor.authorBijl, Peter-
dc.contributor.authorGuerstein, Raquel-
dc.contributor.authorSanmiguel Jaimes, Edgar-
dc.contributor.authorSluijs, Appy-
dc.contributor.authorCasadio, Silvio Alberto-
dc.contributor.authorValencia, Víctor-
dc.contributor.authorAmenábar, Cecilia-
dc.contributor.authorEncinas, Alfonso-
dc.date.accessioned2021-09-06T17:14:37Z-
dc.date.available2021-09-06T17:14:37Z-
dc.date.issued2021-
dc.identifier.citationBijl, P. K., Guerstein, G. R., Jaimes, E. A. S., Sluijs, A., Casadio, S., Valencia, V., Amenábar, C. & Encinas, A. (2021). Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow. Andean Geology; 48 (2); 185-218.es_ES
dc.identifier.issn0718-7106es_ES
dc.identifier.otherhttp://www.andeangeology.cl/index.php/revista1/article/view/V48n2-3339es_ES
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/7529-
dc.description.abstractThe tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallowmarine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a continuous surface-water connection between the south Pacific and the South Atlantic throughout the late Cretaceous-early Paleogene.es_ES
dc.format.extentp. 185-218es_ES
dc.language.isoenes_ES
dc.publisherServicio Nacional de Geología y Mineríaes_ES
dc.relation.urihttp://www.andeangeology.cl/index.php/revista1/indexes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleCampanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflowes_ES
dc.typeArticuloes_ES
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)-
dc.description.filiationFil: Bijl, Peter. Department of Earth Sciences, Laboratory of Palaeobotany and Palynology, Utrecht University. The Netherlands.es_ES
dc.description.filiationFil: Guerstein, Raquel. Departamento de Geología, Universidad Nacional del Sur-Instituto Geológico del Sur, CONICET. Argentina.es_ES
dc.description.filiationFil: Sanmiguel Jaimes, Edgar. Universidad Andres Bello, Facultad de Ingenieria, Autopista Concepción-Talcahuano. Chile.es_ES
dc.description.filiationFil: Sluijs, Appy. Department of Earth Sciences, Laboratory of Palaeobotany and Palynology, Utrecht University. The Netherlands.es_ES
dc.description.filiationFil: Casadio, Silvio. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationFil: Valencia, Víctor. School of the Environment, Washington State University. USA.es_ES
dc.description.filiationFil: Amenábar, Cecilia. Instituto Antártico Argentino-Instituto de Estudios Andinos Don Pablo Groeber-CONICET-Dpto. Ciencias Geológicas, Universidad de Buenos Aires. Argentina.es_ES
dc.description.filiationFil: Encinas, Alfonso. Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción. Chile.es_ES
dc.subject.keywordDinoflagellate Cystses_ES
dc.subject.keywordBiostratigraphyes_ES
dc.subject.keywordRadiometric Datinges_ES
dc.subject.keywordDrake Passagees_ES
dc.subject.keywordPaleoceanographyes_ES
dc.subject.keywordEndemismes_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.materiaCiencias Exactas y Naturaleses_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.relation.journalissue48 (2)es_ES
dc.description.reviewtruees_ES
dc.description.resumen-es_ES
dc.identifier.doihttp://dx.doi.org/10.5027/andgeoV48n2-3339-
dc.relation.journalTitleAndean Geologyes_ES
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