New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages

Autores
Krause, Javier Marcelo; Clyde, William C.; Ibañez Mejía, Mauricio; Schmitz, Mark D.; Barnum, Timothy; Bellosi, Eduardo Sergio; Wilf, Peter
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Río Chico Group in the San Jorge Basin of central Patagonia (Argentina) preserves some of South America’s most significant Paleogene records of biotic and climatic change. Three of its constituent formations, the Peñas Coloradas, Las Flores, and KoluelKaike, host vertebrate faunas referred to the “Carodnia faunal zone,” the Itaboraian South American Land Mammal Age (SALMA), and the Riochican SALMA. However, the precise absolute ages of these units, and thus their associated faunas and paleoclimate records, are poorly resolved. Herein, we report new paleomagnetic and geochronologic results from these formations in south-central Chubut Province, Argentina. U-Pb dating of four volcanic ashes, using both laser ablation– multicollector–inductively coupled plasma– mass spectrometry and high-resolution chemical abrasion–isotope dilution–thermal ionization mass spectrometry, indicates ages of igneous crystallization of 51.403  ± 0.037 (0.045) [0.071]  Ma for a level within the middle Las Flores Formation and 46.714  ± 0.012 (0.026) [0.057]  Ma, 44.579  ± 0.013 (0.026) [0.054] Ma, and 42.856 ± 0.017 (0.027) [0.054] Ma for levels in the lower, middle, and upper Koluel-Kaike Formation, respectively. Combining these with previous isotopic ages in our new magnetostratigraphic framework, we correlate the Peñas Coloradas Formation to chrons C27n-26r (ca. 62.5 to ca. 61.6 Ma; late Danian) and the section from the middle Las Flores to the uppermost Koluel-Kaike to chrons C23n to C19r (ca. 51.4–42.2 Ma; mid Ypresian–late Lutetian). We combine these data with other recently published chronostratigraphic results from Paleogene units in Patagonia to better constrain the ages of noteworthy Paleogene plant and mammal fossil sites in Patagonia and to develop a revised temporal calibration of the Las Flores, Vacan, and “Sapoan” faunas.
Fil: Krause, Javier Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Clyde, William C.. University of New Hampshire; Estados Unidos
Fil: Ibañez Mejía, Mauricio. Massachusetts Institute of Technology; Estados Unidos. University of Rochester; Estados Unidos
Fil: Schmitz, Mark D.. Boise State University; Estados Unidos
Fil: Barnum, Timothy. University of New Hampshire; Estados Unidos
Fil: Bellosi, Eduardo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
Materia
Paleogene
Chronostratigraphy
Salma
Central Patagonia
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/40835
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/40835
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal AgesKrause, Javier MarceloClyde, William C.Ibañez Mejía, MauricioSchmitz, Mark D.Barnum, TimothyBellosi, Eduardo SergioWilf, PeterPaleogeneChronostratigraphySalmaCentral Patagoniahttps://purl.org/becyt/ford/4.3https://purl.org/becyt/ford/4The Río Chico Group in the San Jorge Basin of central Patagonia (Argentina) preserves some of South America’s most significant Paleogene records of biotic and climatic change. Three of its constituent formations, the Peñas Coloradas, Las Flores, and KoluelKaike, host vertebrate faunas referred to the “Carodnia faunal zone,” the Itaboraian South American Land Mammal Age (SALMA), and the Riochican SALMA. However, the precise absolute ages of these units, and thus their associated faunas and paleoclimate records, are poorly resolved. Herein, we report new paleomagnetic and geochronologic results from these formations in south-central Chubut Province, Argentina. U-Pb dating of four volcanic ashes, using both laser ablation– multicollector–inductively coupled plasma– mass spectrometry and high-resolution chemical abrasion–isotope dilution–thermal ionization mass spectrometry, indicates ages of igneous crystallization of 51.403  ± 0.037 (0.045) [0.071]  Ma for a level within the middle Las Flores Formation and 46.714  ± 0.012 (0.026) [0.057]  Ma, 44.579  ± 0.013 (0.026) [0.054] Ma, and 42.856 ± 0.017 (0.027) [0.054] Ma for levels in the lower, middle, and upper Koluel-Kaike Formation, respectively. Combining these with previous isotopic ages in our new magnetostratigraphic framework, we correlate the Peñas Coloradas Formation to chrons C27n-26r (ca. 62.5 to ca. 61.6 Ma; late Danian) and the section from the middle Las Flores to the uppermost Koluel-Kaike to chrons C23n to C19r (ca. 51.4–42.2 Ma; mid Ypresian–late Lutetian). We combine these data with other recently published chronostratigraphic results from Paleogene units in Patagonia to better constrain the ages of noteworthy Paleogene plant and mammal fossil sites in Patagonia and to develop a revised temporal calibration of the Las Flores, Vacan, and “Sapoan” faunas.Fil: Krause, Javier Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Clyde, William C.. University of New Hampshire; Estados UnidosFil: Ibañez Mejía, Mauricio. Massachusetts Institute of Technology; Estados Unidos. University of Rochester; Estados UnidosFil: Schmitz, Mark D.. Boise State University; Estados UnidosFil: Barnum, Timothy. University of New Hampshire; Estados UnidosFil: Bellosi, Eduardo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Wilf, Peter. State University of Pennsylvania; Estados UnidosGeological Society of America2017-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/40835Krause, Javier Marcelo; Clyde, William C.; Ibañez Mejía, Mauricio; Schmitz, Mark D.; Barnum, Timothy; et al.; New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages; Geological Society of America; Geological Society Of America Bulletin; 129; 7-8; 7-2017; 886-9030016-7606CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1130/B31561.1info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/gsabulletin/article/129/7-8/886/208095/New-age-constraints-for-early-Paleogene-strata-ofinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:04:39Zoai:ri.conicet.gov.ar:11336/40835instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:04:40.288CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
title New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
spellingShingle New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
Krause, Javier Marcelo
Paleogene
Chronostratigraphy
Salma
Central Patagonia
title_short New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
title_full New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
title_fullStr New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
title_full_unstemmed New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
title_sort New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages
dc.creator.none.fl_str_mv Krause, Javier Marcelo
Clyde, William C.
Ibañez Mejía, Mauricio
Schmitz, Mark D.
Barnum, Timothy
Bellosi, Eduardo Sergio
Wilf, Peter
author Krause, Javier Marcelo
author_facet Krause, Javier Marcelo
Clyde, William C.
Ibañez Mejía, Mauricio
Schmitz, Mark D.
Barnum, Timothy
Bellosi, Eduardo Sergio
Wilf, Peter
author_role author
author2 Clyde, William C.
Ibañez Mejía, Mauricio
Schmitz, Mark D.
Barnum, Timothy
Bellosi, Eduardo Sergio
Wilf, Peter
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Paleogene
Chronostratigraphy
Salma
Central Patagonia
topic Paleogene
Chronostratigraphy
Salma
Central Patagonia
purl_subject.fl_str_mv https://purl.org/becyt/ford/4.3
https://purl.org/becyt/ford/4
dc.description.none.fl_txt_mv The Río Chico Group in the San Jorge Basin of central Patagonia (Argentina) preserves some of South America’s most significant Paleogene records of biotic and climatic change. Three of its constituent formations, the Peñas Coloradas, Las Flores, and KoluelKaike, host vertebrate faunas referred to the “Carodnia faunal zone,” the Itaboraian South American Land Mammal Age (SALMA), and the Riochican SALMA. However, the precise absolute ages of these units, and thus their associated faunas and paleoclimate records, are poorly resolved. Herein, we report new paleomagnetic and geochronologic results from these formations in south-central Chubut Province, Argentina. U-Pb dating of four volcanic ashes, using both laser ablation– multicollector–inductively coupled plasma– mass spectrometry and high-resolution chemical abrasion–isotope dilution–thermal ionization mass spectrometry, indicates ages of igneous crystallization of 51.403  ± 0.037 (0.045) [0.071]  Ma for a level within the middle Las Flores Formation and 46.714  ± 0.012 (0.026) [0.057]  Ma, 44.579  ± 0.013 (0.026) [0.054] Ma, and 42.856 ± 0.017 (0.027) [0.054] Ma for levels in the lower, middle, and upper Koluel-Kaike Formation, respectively. Combining these with previous isotopic ages in our new magnetostratigraphic framework, we correlate the Peñas Coloradas Formation to chrons C27n-26r (ca. 62.5 to ca. 61.6 Ma; late Danian) and the section from the middle Las Flores to the uppermost Koluel-Kaike to chrons C23n to C19r (ca. 51.4–42.2 Ma; mid Ypresian–late Lutetian). We combine these data with other recently published chronostratigraphic results from Paleogene units in Patagonia to better constrain the ages of noteworthy Paleogene plant and mammal fossil sites in Patagonia and to develop a revised temporal calibration of the Las Flores, Vacan, and “Sapoan” faunas.
Fil: Krause, Javier Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Clyde, William C.. University of New Hampshire; Estados Unidos
Fil: Ibañez Mejía, Mauricio. Massachusetts Institute of Technology; Estados Unidos. University of Rochester; Estados Unidos
Fil: Schmitz, Mark D.. Boise State University; Estados Unidos
Fil: Barnum, Timothy. University of New Hampshire; Estados Unidos
Fil: Bellosi, Eduardo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
description The Río Chico Group in the San Jorge Basin of central Patagonia (Argentina) preserves some of South America’s most significant Paleogene records of biotic and climatic change. Three of its constituent formations, the Peñas Coloradas, Las Flores, and KoluelKaike, host vertebrate faunas referred to the “Carodnia faunal zone,” the Itaboraian South American Land Mammal Age (SALMA), and the Riochican SALMA. However, the precise absolute ages of these units, and thus their associated faunas and paleoclimate records, are poorly resolved. Herein, we report new paleomagnetic and geochronologic results from these formations in south-central Chubut Province, Argentina. U-Pb dating of four volcanic ashes, using both laser ablation– multicollector–inductively coupled plasma– mass spectrometry and high-resolution chemical abrasion–isotope dilution–thermal ionization mass spectrometry, indicates ages of igneous crystallization of 51.403  ± 0.037 (0.045) [0.071]  Ma for a level within the middle Las Flores Formation and 46.714  ± 0.012 (0.026) [0.057]  Ma, 44.579  ± 0.013 (0.026) [0.054] Ma, and 42.856 ± 0.017 (0.027) [0.054] Ma for levels in the lower, middle, and upper Koluel-Kaike Formation, respectively. Combining these with previous isotopic ages in our new magnetostratigraphic framework, we correlate the Peñas Coloradas Formation to chrons C27n-26r (ca. 62.5 to ca. 61.6 Ma; late Danian) and the section from the middle Las Flores to the uppermost Koluel-Kaike to chrons C23n to C19r (ca. 51.4–42.2 Ma; mid Ypresian–late Lutetian). We combine these data with other recently published chronostratigraphic results from Paleogene units in Patagonia to better constrain the ages of noteworthy Paleogene plant and mammal fossil sites in Patagonia and to develop a revised temporal calibration of the Las Flores, Vacan, and “Sapoan” faunas.
publishDate 2017
dc.date.none.fl_str_mv 2017-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/40835
Krause, Javier Marcelo; Clyde, William C.; Ibañez Mejía, Mauricio; Schmitz, Mark D.; Barnum, Timothy; et al.; New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages; Geological Society of America; Geological Society Of America Bulletin; 129; 7-8; 7-2017; 886-903
0016-7606
CONICET Digital
CONICET
url http://hdl.handle.net/11336/40835
identifier_str_mv Krause, Javier Marcelo; Clyde, William C.; Ibañez Mejía, Mauricio; Schmitz, Mark D.; Barnum, Timothy; et al.; New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages; Geological Society of America; Geological Society Of America Bulletin; 129; 7-8; 7-2017; 886-903
0016-7606
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1130/B31561.1
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/gsabulletin/article/129/7-8/886/208095/New-age-constraints-for-early-Paleogene-strata-of
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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