High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia

The Baqueró Group is one of the most relevant units regarding the study of the early diversification of angiosperms in South America. Whereas the age of the upper part of the Group, namely the Punta del Barco Formation, has been recently dated at 114.67±0.18Ma, the rest of the unit still lacks preci...

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Autores principales: Perez Loinaze, V.S., Vera, E.I., Passalia, M.G., Llorens, M., Friedman, R., Limarino, C.O., Césari, S.N.
Formato: JOUR
Materias:
Angiosperms
Aptian
Baqueró Group
Cretaceous
Geochronology
Paleobotany
Palynology
Patagonia
age determination
angiosperm
fossil assemblage
geochronology
lithostratigraphy
paleobotany
palynology
precision
uranium-lead dating
zircon
Magnoliophyta
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v48_n_p97_PerezLoinaze
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v48_n_p97_PerezLoinaze
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spelling todo:paper_08959811_v48_n_p97_PerezLoinaze2023-10-03T15:43:10Z High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia Perez Loinaze, V.S. Vera, E.I. Passalia, M.G. Llorens, M. Friedman, R. Limarino, C.O. Césari, S.N. Angiosperms Aptian Baqueró Group Cretaceous Geochronology Paleobotany Palynology Patagonia age determination angiosperm Aptian fossil assemblage geochronology lithostratigraphy paleobotany palynology precision uranium-lead dating zircon Patagonia Magnoliophyta The Baqueró Group is one of the most relevant units regarding the study of the early diversification of angiosperms in South America. Whereas the age of the upper part of the Group, namely the Punta del Barco Formation, has been recently dated at 114.67±0.18Ma, the rest of the unit still lacks precise dating. In this contribution a CA-TIMS U-Pb zircon age of 118.23±0.09Ma for a tuff interlayered with fossiliferous rocks of the Anfiteatro de Ticó Formation (lower part of the Baqueró Group) is reported. This age constrains the duration of deposition of the Baqueró Group to approximately 4Ma and provides new evidence for the age interpretation of the previously described angiosperm flora and associated pollen assemblages from this unit, until now interpreted as early Aptian or possibly Barremian in age. The Aptian age of the Baqueró Group allows a better comparison between the paleofloras from this southernmost region. © 2013 Elsevier Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v48_n_p97_PerezLoinaze
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Angiosperms
Aptian
Baqueró Group
Cretaceous
Geochronology
Paleobotany
Palynology
Patagonia
age determination
angiosperm
Aptian
fossil assemblage
geochronology
lithostratigraphy
paleobotany
palynology
precision
uranium-lead dating
zircon
Patagonia
Magnoliophyta
spellingShingle Angiosperms
Aptian
Baqueró Group
Cretaceous
Geochronology
Paleobotany
Palynology
Patagonia
age determination
angiosperm
Aptian
fossil assemblage
geochronology
lithostratigraphy
paleobotany
palynology
precision
uranium-lead dating
zircon
Patagonia
Magnoliophyta
Perez Loinaze, V.S.
Vera, E.I.
Passalia, M.G.
Llorens, M.
Friedman, R.
Limarino, C.O.
Césari, S.N.
High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
topic_facet Angiosperms
Aptian
Baqueró Group
Cretaceous
Geochronology
Paleobotany
Palynology
Patagonia
age determination
angiosperm
Aptian
fossil assemblage
geochronology
lithostratigraphy
paleobotany
palynology
precision
uranium-lead dating
zircon
Patagonia
Magnoliophyta
description The Baqueró Group is one of the most relevant units regarding the study of the early diversification of angiosperms in South America. Whereas the age of the upper part of the Group, namely the Punta del Barco Formation, has been recently dated at 114.67±0.18Ma, the rest of the unit still lacks precise dating. In this contribution a CA-TIMS U-Pb zircon age of 118.23±0.09Ma for a tuff interlayered with fossiliferous rocks of the Anfiteatro de Ticó Formation (lower part of the Baqueró Group) is reported. This age constrains the duration of deposition of the Baqueró Group to approximately 4Ma and provides new evidence for the age interpretation of the previously described angiosperm flora and associated pollen assemblages from this unit, until now interpreted as early Aptian or possibly Barremian in age. The Aptian age of the Baqueró Group allows a better comparison between the paleofloras from this southernmost region. © 2013 Elsevier Ltd.
format JOUR
author Perez Loinaze, V.S.
Vera, E.I.
Passalia, M.G.
Llorens, M.
Friedman, R.
Limarino, C.O.
Césari, S.N.
author_facet Perez Loinaze, V.S.
Vera, E.I.
Passalia, M.G.
Llorens, M.
Friedman, R.
Limarino, C.O.
Césari, S.N.
author_sort Perez Loinaze, V.S.
title High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
title_short High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
title_full High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
title_fullStr High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
title_full_unstemmed High-precision U-Pb zircon age from the Anfiteatro de Ticó Formation: Implications for the timing of the early angiosperm diversification in Patagonia
title_sort high-precision u-pb zircon age from the anfiteatro de ticó formation: implications for the timing of the early angiosperm diversification in patagonia
url http://hdl.handle.net/20.500.12110/paper_08959811_v48_n_p97_PerezLoinaze
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