Patagonian aridification at the onset of the mid-Miocene Climatic Optimum

Autores
Trayler, Robin B.; Kohn, Matthew J.; Bargo, María Susana; Cuitiño, José Ignacio; Kay, Richard F.; Stromberg, Caroline Anna Elisabet; Vizcaíno, Sergio Fabián
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fossil-rich sediments of the Santa Cruz Formation, Patagonia, Argentina, span the initiation of the Miocene Climatic Optimum (MCO), the most recent period of warm and wet conditions in the Cenozoic. These conditions drove the expansion of tropical and subtropical ecosystems to much higher latitudes, with the fossiliferous Santa Cruz Formation recording one of the southernmost examples. We collected new carbon and oxygen isotope compositions of herbivore tooth enamel from fossils ~17.4 to 16.4 Ma in age to investigate ecological and climatic changes across the initiation of the MCO. Enamel δ13C values are consistent with a C3-dominated ecosystem with moderate precipitation and a mix of wooded and more open areas. Serially sampled teeth reveal little zoning in δ13C and δ18O values, suggesting little seasonal variation in water and plant isotope compositions or seasonal changes in diet. Carbon isotope-based estimates of mean annual precipitation (MAP) are consistent with aridification, with MAP decreasing from ~1,000 ± 235 mm/yr at 17.4 Ma to ~525 ± 105 mm/yr at the start of the climatic optimum (~16.9 Ma). This decrease corresponds to increasing global temperatures, as indicated by marine proxy records, and was followed by a rebound to ~840 ± 270 mm/yr by ~16.4 Ma. In comparison to a modern mean annual temperature (MAT) in the region of ~8°C, oxygen isotopes indicate high MAT (at least 20°C) at the onset of the MCO at 16.9 Ma and a significant increase in MAT to ~25°C by 16.4 Ma.
Fil: Trayler, Robin B.. University of California Merced. Department of Life and Environmental Sciences; Estados Unidos. Boise State University. Department of Geosciences; Estados Unidos
Fil: Kohn, Matthew J.. Boise State University. Department of Geosciences; Estados Unidos
Fil: Bargo, María Susana. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Kay, Richard F.. University of Duke; Estados Unidos
Fil: Stromberg, Caroline Anna Elisabet. University of Washington; Estados Unidos
Fil: Vizcaíno, Sergio Fabián. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
MIOCENE
MMCO
PRECIPITATION
SANTA CRUZ FORMATION
SOUTH AMERICA
TEMPERATURE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/117601
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Patagonian aridification at the onset of the mid-Miocene Climatic OptimumTrayler, Robin B.Kohn, Matthew J.Bargo, María SusanaCuitiño, José IgnacioKay, Richard F.Stromberg, Caroline Anna ElisabetVizcaíno, Sergio FabiánMIOCENEMMCOPRECIPITATIONSANTA CRUZ FORMATIONSOUTH AMERICATEMPERATUREhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Fossil-rich sediments of the Santa Cruz Formation, Patagonia, Argentina, span the initiation of the Miocene Climatic Optimum (MCO), the most recent period of warm and wet conditions in the Cenozoic. These conditions drove the expansion of tropical and subtropical ecosystems to much higher latitudes, with the fossiliferous Santa Cruz Formation recording one of the southernmost examples. We collected new carbon and oxygen isotope compositions of herbivore tooth enamel from fossils ~17.4 to 16.4 Ma in age to investigate ecological and climatic changes across the initiation of the MCO. Enamel δ13C values are consistent with a C3-dominated ecosystem with moderate precipitation and a mix of wooded and more open areas. Serially sampled teeth reveal little zoning in δ13C and δ18O values, suggesting little seasonal variation in water and plant isotope compositions or seasonal changes in diet. Carbon isotope-based estimates of mean annual precipitation (MAP) are consistent with aridification, with MAP decreasing from ~1,000 ± 235 mm/yr at 17.4 Ma to ~525 ± 105 mm/yr at the start of the climatic optimum (~16.9 Ma). This decrease corresponds to increasing global temperatures, as indicated by marine proxy records, and was followed by a rebound to ~840 ± 270 mm/yr by ~16.4 Ma. In comparison to a modern mean annual temperature (MAT) in the region of ~8°C, oxygen isotopes indicate high MAT (at least 20°C) at the onset of the MCO at 16.9 Ma and a significant increase in MAT to ~25°C by 16.4 Ma.Fil: Trayler, Robin B.. University of California Merced. Department of Life and Environmental Sciences; Estados Unidos. Boise State University. Department of Geosciences; Estados UnidosFil: Kohn, Matthew J.. Boise State University. Department of Geosciences; Estados UnidosFil: Bargo, María Susana. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; ArgentinaFil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; ArgentinaFil: Kay, Richard F.. University of Duke; Estados UnidosFil: Stromberg, Caroline Anna Elisabet. University of Washington; Estados UnidosFil: Vizcaíno, Sergio Fabián. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaJohn Wiley & Sons Inc2020-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/117601Trayler, Robin B.; Kohn, Matthew J.; Bargo, María Susana; Cuitiño, José Ignacio; Kay, Richard F.; et al.; Patagonian aridification at the onset of the mid-Miocene Climatic Optimum; John Wiley & Sons Inc; Paleoceanography and Paleoclimatology; 35; 9; 9-2020; 1-562572-4525CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/10.1029/2020PA003956info:eu-repo/semantics/altIdentifier/doi/10.1029/2020PA003956info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:03:31Zoai:ri.conicet.gov.ar:11336/117601instacron: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:34982025-10-15 15:03:31.806CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
title Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
spellingShingle Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
Trayler, Robin B.
MIOCENE
MMCO
PRECIPITATION
SANTA CRUZ FORMATION
SOUTH AMERICA
TEMPERATURE
title_short Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
title_full Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
title_fullStr Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
title_full_unstemmed Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
title_sort Patagonian aridification at the onset of the mid-Miocene Climatic Optimum
dc.creator.none.fl_str_mv Trayler, Robin B.
Kohn, Matthew J.
Bargo, María Susana
Cuitiño, José Ignacio
Kay, Richard F.
Stromberg, Caroline Anna Elisabet
Vizcaíno, Sergio Fabián
author Trayler, Robin B.
author_facet Trayler, Robin B.
Kohn, Matthew J.
Bargo, María Susana
Cuitiño, José Ignacio
Kay, Richard F.
Stromberg, Caroline Anna Elisabet
Vizcaíno, Sergio Fabián
author_role author
author2 Kohn, Matthew J.
Bargo, María Susana
Cuitiño, José Ignacio
Kay, Richard F.
Stromberg, Caroline Anna Elisabet
Vizcaíno, Sergio Fabián
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv MIOCENE
MMCO
PRECIPITATION
SANTA CRUZ FORMATION
SOUTH AMERICA
TEMPERATURE
topic MIOCENE
MMCO
PRECIPITATION
SANTA CRUZ FORMATION
SOUTH AMERICA
TEMPERATURE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Fossil-rich sediments of the Santa Cruz Formation, Patagonia, Argentina, span the initiation of the Miocene Climatic Optimum (MCO), the most recent period of warm and wet conditions in the Cenozoic. These conditions drove the expansion of tropical and subtropical ecosystems to much higher latitudes, with the fossiliferous Santa Cruz Formation recording one of the southernmost examples. We collected new carbon and oxygen isotope compositions of herbivore tooth enamel from fossils ~17.4 to 16.4 Ma in age to investigate ecological and climatic changes across the initiation of the MCO. Enamel δ13C values are consistent with a C3-dominated ecosystem with moderate precipitation and a mix of wooded and more open areas. Serially sampled teeth reveal little zoning in δ13C and δ18O values, suggesting little seasonal variation in water and plant isotope compositions or seasonal changes in diet. Carbon isotope-based estimates of mean annual precipitation (MAP) are consistent with aridification, with MAP decreasing from ~1,000 ± 235 mm/yr at 17.4 Ma to ~525 ± 105 mm/yr at the start of the climatic optimum (~16.9 Ma). This decrease corresponds to increasing global temperatures, as indicated by marine proxy records, and was followed by a rebound to ~840 ± 270 mm/yr by ~16.4 Ma. In comparison to a modern mean annual temperature (MAT) in the region of ~8°C, oxygen isotopes indicate high MAT (at least 20°C) at the onset of the MCO at 16.9 Ma and a significant increase in MAT to ~25°C by 16.4 Ma.
Fil: Trayler, Robin B.. University of California Merced. Department of Life and Environmental Sciences; Estados Unidos. Boise State University. Department of Geosciences; Estados Unidos
Fil: Kohn, Matthew J.. Boise State University. Department of Geosciences; Estados Unidos
Fil: Bargo, María Susana. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
Fil: Kay, Richard F.. University of Duke; Estados Unidos
Fil: Stromberg, Caroline Anna Elisabet. University of Washington; Estados Unidos
Fil: Vizcaíno, Sergio Fabián. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Fossil-rich sediments of the Santa Cruz Formation, Patagonia, Argentina, span the initiation of the Miocene Climatic Optimum (MCO), the most recent period of warm and wet conditions in the Cenozoic. These conditions drove the expansion of tropical and subtropical ecosystems to much higher latitudes, with the fossiliferous Santa Cruz Formation recording one of the southernmost examples. We collected new carbon and oxygen isotope compositions of herbivore tooth enamel from fossils ~17.4 to 16.4 Ma in age to investigate ecological and climatic changes across the initiation of the MCO. Enamel δ13C values are consistent with a C3-dominated ecosystem with moderate precipitation and a mix of wooded and more open areas. Serially sampled teeth reveal little zoning in δ13C and δ18O values, suggesting little seasonal variation in water and plant isotope compositions or seasonal changes in diet. Carbon isotope-based estimates of mean annual precipitation (MAP) are consistent with aridification, with MAP decreasing from ~1,000 ± 235 mm/yr at 17.4 Ma to ~525 ± 105 mm/yr at the start of the climatic optimum (~16.9 Ma). This decrease corresponds to increasing global temperatures, as indicated by marine proxy records, and was followed by a rebound to ~840 ± 270 mm/yr by ~16.4 Ma. In comparison to a modern mean annual temperature (MAT) in the region of ~8°C, oxygen isotopes indicate high MAT (at least 20°C) at the onset of the MCO at 16.9 Ma and a significant increase in MAT to ~25°C by 16.4 Ma.
publishDate 2020
dc.date.none.fl_str_mv 2020-09
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/11336/117601
Trayler, Robin B.; Kohn, Matthew J.; Bargo, María Susana; Cuitiño, José Ignacio; Kay, Richard F.; et al.; Patagonian aridification at the onset of the mid-Miocene Climatic Optimum; John Wiley & Sons Inc; Paleoceanography and Paleoclimatology; 35; 9; 9-2020; 1-56
2572-4525
CONICET Digital
CONICET
url http://hdl.handle.net/11336/117601
identifier_str_mv Trayler, Robin B.; Kohn, Matthew J.; Bargo, María Susana; Cuitiño, José Ignacio; Kay, Richard F.; et al.; Patagonian aridification at the onset of the mid-Miocene Climatic Optimum; John Wiley & Sons Inc; Paleoceanography and Paleoclimatology; 35; 9; 9-2020; 1-56
2572-4525
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/10.1029/2020PA003956
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020PA003956
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons Inc
publisher.none.fl_str_mv John Wiley & Sons Inc
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 13.22299

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