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dc.contributor.author
Fosdick, Julie C.
dc.contributor.author
VanderLeest, R. A.
dc.contributor.author
Bostelmann, J. E.
dc.contributor.author
Leonard, J. S.
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Ugalde, R.
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Oyarzún, J. L.
dc.contributor.author
Griffin, Miguel
dc.date.available
2022-10-17T18:42:29Z
dc.date.issued
2020-09
dc.identifier.citation
Fosdick, Julie C.; VanderLeest, R. A.; Bostelmann, J. E.; Leonard, J. S.; Ugalde, R.; et al.; Revised timing of cenozoic atlantic incursions and changing hinterland sediment sources during southern patagonian orogenesis; Geoscienceworld; Lithosphere; 2020; 1; 9-2020; 1-18
dc.identifier.issn
1941-8264
dc.identifier.uri
http://hdl.handle.net/11336/173599
dc.description.abstract
New detrital zircon U-Pb geochronology data from the Cenozoic Magallanes-Austral Basin in Argentina and Chile ~51° S establish a revised chronostratigraphy of Paleocene-Miocene foreland synorogenic strata and document the rise and subsequent isolation of hinterland sources in the Patagonian Andes from the continental margin. The upsection loss of zircons derived from the hinterland Paleozoic and Late Jurassic sources between ca. 60 and 44Ma documents a major shift in sediment routing due to Paleogene orogenesis in the greater Patagonian-Fuegian Andes. Changes in the proportion of grains from hinterland thrust sheets, comprised of Jurassic volcanics and Paleozoic metasedimentary rocks, provide a trackable signal of long-term shifts in orogenic drainage divide and topographic isolation due to widening of the retroarc fold-thrust belt. The youngest detrital zircon U-Pb ages confirm timing of Maastrichtian-Eocene strata but require substantial age revisions for part of the overlying Cenozoic basinfill during the late Eocene and Oligocene. The upper Río Turbio Formation, previously mapped as middle to late Eocene in the published literature, records a newly recognized latest Eocene-Oligocene (37-27Ma) marine incursion along the basin margin. We suggest that these deposits could be genetically linked to the distally placed units along the Atlantic coast, including the El Huemul Formation and the younger San Julián Formation, via an eastward deepening within the foreland basin system that culminated in a basin-wide Oligocene marine incursion in the Southern Andes. The overlying Río Guillermo Formation records onset of tectonically generated coarse-grained detritus ca. 24.3Ma and a transition to the first fully nonmarine conditions on the proximal Patagonian platform since Late Cretaceous time, perhaps signaling a Cordilleran-scale upper plate response to increased plate convergence and tectonic plate reorganization.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geoscienceworld
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Cenozoic Magallanes-Austral Basin
dc.subject
U-Pb geochronology
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Río Turbio Formation
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Timing of Cenozoic Atlantic Incursions
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Geociencias multidisciplinaria
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Revised timing of cenozoic atlantic incursions and changing hinterland sediment sources during southern patagonian orogenesis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-09-16T20:44:37Z
dc.identifier.eissn
1947-4253
dc.journal.volume
2020
dc.journal.number
1
dc.journal.pagination
1-18
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Fosdick, Julie C.. University of Connecticut; Estados Unidos
dc.description.fil
Fil: VanderLeest, R. A.. University of Connecticut; Estados Unidos
dc.description.fil
Fil: Bostelmann, J. E.. Universidad de Chile; Chile
dc.description.fil
Fil: Leonard, J. S.. Arizona State University; Estados Unidos
dc.description.fil
Fil: Ugalde, R.. Universidad Mayor; Chile
dc.description.fil
Fil: Oyarzún, J. L.. Parque Geo-paleontológico la Cumbre-baguales; Chile
dc.description.fil
Fil: Griffin, Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
dc.journal.title
Lithosphere
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.2113/2020/8883099
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/lithosphere/article/2020/1/8883099/590463/Revised-Timing-of-Cenozoic-Atlantic-Incursions-and
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