U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities

The early Miocene Santa Cruz Formation (SCF) in southern Patagonia hosts the Santacrucian South American Land Mammal Age (SALMA), whose age is known mainly from exposures along the Atlantic coast. Zircon U-Pb ages were obtained from intercalated tuffs from four inland sections of the SCF: 17.36 ± 0....

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Detalles Bibliográficos
Publicado: 2016
Materias:
Chronostratigraphy
Fossil mammals
Notohippidian
Santacrucian
chronostratigraphy
fauna
fossil record
geochronology
mammal
Miocene
sedimentation rate
uranium-lead dating
zircon
Argentina
Patagonia
Mammalia
Vertebrata
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v70_n_p198_Cuitino
http://hdl.handle.net/20.500.12110/paper_08959811_v70_n_p198_Cuitino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v70_n_p198_Cuitino
record_format dspace
spelling paper:paper_08959811_v70_n_p198_Cuitino2023-06-08T15:48:54Z U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities Chronostratigraphy Fossil mammals Notohippidian Santacrucian chronostratigraphy fauna fossil record geochronology mammal Miocene sedimentation rate uranium-lead dating zircon Argentina Patagonia Mammalia Vertebrata The early Miocene Santa Cruz Formation (SCF) in southern Patagonia hosts the Santacrucian South American Land Mammal Age (SALMA), whose age is known mainly from exposures along the Atlantic coast. Zircon U-Pb ages were obtained from intercalated tuffs from four inland sections of the SCF: 17.36 ± 0.63 Ma for the westernmost Río Bote locality, and 17.04 ± 0.55 Ma-16.32 ± 0.62 Ma for central Río Santa Cruz localities. All ages agree with the bounding age of underlying marine units and with equivalent strata in coastal exposures. New ages and available sedimentation rates imply time spans for each section of ~18.2 to 17.36 Ma for Río Bote and 17.45-15.63 Ma for central Río Santa Cruz (Burdigalian). These estimates support the view that deposition of the SCF began at western localities ~1 Ma earlier than at eastern localities, and that the central Río Santa Cruz localities expose the youngest SCF in southern Santa Cruz Province. Associated vertebrate faunas are consistent with our geochronologic synthesis, showing older (Notohippidian) taxa in western localities and younger (Santacrucian) taxa in central localities. The Notohippidian fauna (19.0-18.0 Ma) of the western localities is synchronous with Pinturan faunas (19.0-18.0 Ma), but older than Santacrucian faunas of the Río Santa Cruz (17.2-15.6 Ma) and coastal localities (18.0-16.2 Ma). The Santacrucian faunas of the central Río Santa Cruz localities temporally overlap Colloncuran (15.7 Ma), Friasian (16.5 Ma), and eastern Santacrucian faunas. © 2016 Elsevier Ltd. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v70_n_p198_Cuitino http://hdl.handle.net/20.500.12110/paper_08959811_v70_n_p198_Cuitino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chronostratigraphy
Fossil mammals
Notohippidian
Santacrucian
chronostratigraphy
fauna
fossil record
geochronology
mammal
Miocene
sedimentation rate
uranium-lead dating
zircon
Argentina
Patagonia
Mammalia
Vertebrata
spellingShingle Chronostratigraphy
Fossil mammals
Notohippidian
Santacrucian
chronostratigraphy
fauna
fossil record
geochronology
mammal
Miocene
sedimentation rate
uranium-lead dating
zircon
Argentina
Patagonia
Mammalia
Vertebrata
U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
topic_facet Chronostratigraphy
Fossil mammals
Notohippidian
Santacrucian
chronostratigraphy
fauna
fossil record
geochronology
mammal
Miocene
sedimentation rate
uranium-lead dating
zircon
Argentina
Patagonia
Mammalia
Vertebrata
description The early Miocene Santa Cruz Formation (SCF) in southern Patagonia hosts the Santacrucian South American Land Mammal Age (SALMA), whose age is known mainly from exposures along the Atlantic coast. Zircon U-Pb ages were obtained from intercalated tuffs from four inland sections of the SCF: 17.36 ± 0.63 Ma for the westernmost Río Bote locality, and 17.04 ± 0.55 Ma-16.32 ± 0.62 Ma for central Río Santa Cruz localities. All ages agree with the bounding age of underlying marine units and with equivalent strata in coastal exposures. New ages and available sedimentation rates imply time spans for each section of ~18.2 to 17.36 Ma for Río Bote and 17.45-15.63 Ma for central Río Santa Cruz (Burdigalian). These estimates support the view that deposition of the SCF began at western localities ~1 Ma earlier than at eastern localities, and that the central Río Santa Cruz localities expose the youngest SCF in southern Santa Cruz Province. Associated vertebrate faunas are consistent with our geochronologic synthesis, showing older (Notohippidian) taxa in western localities and younger (Santacrucian) taxa in central localities. The Notohippidian fauna (19.0-18.0 Ma) of the western localities is synchronous with Pinturan faunas (19.0-18.0 Ma), but older than Santacrucian faunas of the Río Santa Cruz (17.2-15.6 Ma) and coastal localities (18.0-16.2 Ma). The Santacrucian faunas of the central Río Santa Cruz localities temporally overlap Colloncuran (15.7 Ma), Friasian (16.5 Ma), and eastern Santacrucian faunas. © 2016 Elsevier Ltd.
title U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
title_short U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
title_full U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
title_fullStr U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
title_full_unstemmed U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
title_sort u-pb geochronology of the santa cruz formation (early miocene) at the río bote and río santa cruz (southernmost patagonia, argentina): implications for the correlation of fossil vertebrate localities
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v70_n_p198_Cuitino
http://hdl.handle.net/20.500.12110/paper_08959811_v70_n_p198_Cuitino
_version_ 1768545792192151552

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