Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology

The revision of the stratigraphy of the Cerro Bayo in the Bajo Grande area (Argentinean Patagonia) and the new 206Pb/238U age of 116.85 ± 0.26 Ma constrain the dating of the Baqueró flora, one of the most abundant Aptian floras of southern Gondwana. This flora, preserved in the Baqueró Group, repres...

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Autores principales: Passalia, M.G., Llorens, M., Césari, S.N., Limarino, C.O., Perez Loinaze, V.S., Vera, E.I.
Formato: JOUR
Materias:
Aptian
Baqueró Group
Chubut Group
Cretaceous
Geochronology
Palynology
Patagonia
age determination
angiosperm
biome
flora
geochronology
Gondwana
lithofacies
palynology
stratigraphy
uranium-lead dating
volcanism
Magnoliophyta
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01956671_v60_n_p152_Passalia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01956671_v60_n_p152_Passalia2023-10-03T15:09:34Z Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology Passalia, M.G. Llorens, M. Césari, S.N. Limarino, C.O. Perez Loinaze, V.S. Vera, E.I. Aptian Baqueró Group Chubut Group Cretaceous Geochronology Palynology Patagonia age determination angiosperm biome Cretaceous flora geochronology Gondwana lithofacies palynology stratigraphy uranium-lead dating volcanism Patagonia Magnoliophyta The revision of the stratigraphy of the Cerro Bayo in the Bajo Grande area (Argentinean Patagonia) and the new 206Pb/238U age of 116.85 ± 0.26 Ma constrain the dating of the Baqueró flora, one of the most abundant Aptian floras of southern Gondwana. This flora, preserved in the Baqueró Group, represents an extinct biome that flourished ca. 118 Ma ago and was affected by increasing regional volcanism during the subsequent four millions years. The outcrops of the Cerro Bayo are characterized by fluvio-lacustrine deposits divided into three facies associations that include nine lithofacies. The first palynological record for the locality confirms the correlation of the lower part of the outcrops with the Anfiteatro de Ticó Formation (the oldest unit of the Baqueró Group). The new radiometric age and stratigraphy support recognition of the Bajo Tigre Formation (the middle unit of the Baqueró Group) in the area and date the earliest stage in angiosperm diversification in southern South America. Stratigraphic relationships among the Baqueró, Chubut and Divisadero groups are briefly discussed. © 2015 Elsevier Ltd.. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01956671_v60_n_p152_Passalia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Aptian
Baqueró Group
Chubut Group
Cretaceous
Geochronology
Palynology
Patagonia
age determination
angiosperm
biome
Cretaceous
flora
geochronology
Gondwana
lithofacies
palynology
stratigraphy
uranium-lead dating
volcanism
Patagonia
Magnoliophyta
spellingShingle Aptian
Baqueró Group
Chubut Group
Cretaceous
Geochronology
Palynology
Patagonia
age determination
angiosperm
biome
Cretaceous
flora
geochronology
Gondwana
lithofacies
palynology
stratigraphy
uranium-lead dating
volcanism
Patagonia
Magnoliophyta
Passalia, M.G.
Llorens, M.
Césari, S.N.
Limarino, C.O.
Perez Loinaze, V.S.
Vera, E.I.
Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
topic_facet Aptian
Baqueró Group
Chubut Group
Cretaceous
Geochronology
Palynology
Patagonia
age determination
angiosperm
biome
Cretaceous
flora
geochronology
Gondwana
lithofacies
palynology
stratigraphy
uranium-lead dating
volcanism
Patagonia
Magnoliophyta
description The revision of the stratigraphy of the Cerro Bayo in the Bajo Grande area (Argentinean Patagonia) and the new 206Pb/238U age of 116.85 ± 0.26 Ma constrain the dating of the Baqueró flora, one of the most abundant Aptian floras of southern Gondwana. This flora, preserved in the Baqueró Group, represents an extinct biome that flourished ca. 118 Ma ago and was affected by increasing regional volcanism during the subsequent four millions years. The outcrops of the Cerro Bayo are characterized by fluvio-lacustrine deposits divided into three facies associations that include nine lithofacies. The first palynological record for the locality confirms the correlation of the lower part of the outcrops with the Anfiteatro de Ticó Formation (the oldest unit of the Baqueró Group). The new radiometric age and stratigraphy support recognition of the Bajo Tigre Formation (the middle unit of the Baqueró Group) in the area and date the earliest stage in angiosperm diversification in southern South America. Stratigraphic relationships among the Baqueró, Chubut and Divisadero groups are briefly discussed. © 2015 Elsevier Ltd..
format JOUR
author Passalia, M.G.
Llorens, M.
Césari, S.N.
Limarino, C.O.
Perez Loinaze, V.S.
Vera, E.I.
author_facet Passalia, M.G.
Llorens, M.
Césari, S.N.
Limarino, C.O.
Perez Loinaze, V.S.
Vera, E.I.
author_sort Passalia, M.G.
title Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
title_short Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
title_full Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
title_fullStr Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
title_full_unstemmed Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology
title_sort revised stratigraphic framework of the cretaceous in the bajo grande area (argentinean patagonia) inferred from new u-pb ages and palynology
url http://hdl.handle.net/20.500.12110/paper_01956671_v60_n_p152_Passalia
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