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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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v60_n_p152_Passalia http://hdl.handle.net/20.500.12110/paper_01956671_v60_n_p152_Passalia |
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paper:paper_01956671_v60_n_p152_Passalia2023-06-08T15:20:20Z Revised stratigraphic framework of the Cretaceous in the Bajo Grande area (Argentinean Patagonia) inferred from new U-Pb ages and palynology 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.. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v60_n_p152_Passalia 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 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.. |
| 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 |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v60_n_p152_Passalia http://hdl.handle.net/20.500.12110/paper_01956671_v60_n_p152_Passalia |
| _version_ |
1768541652480163840 |