Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina
This paper documents calcareous nannofossil assemblages and the bioevents recorded in the Austral basin of Tierra del Fuego, Argentina. Fifty samples from the type section of the Cerro Colorado Formation were analyzed. Nannoflora is moderately preserved and indicates a late Eocene to early Oligocene...
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ftconicet:oai:ri.conicet.gov.ar:11336/160060 2023-10-09T21:56:04+02:00 Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina Bedoya Agudelo, Erika Lorena Concheyro, Andrea Olivero, Eduardo Bernardo application/pdf http://hdl.handle.net/11336/160060 eng eng Pergamon-Elsevier Science Ltd info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2021.103581 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981121004272 http://hdl.handle.net/11336/160060 Bedoya Agudelo, Erika Lorena; Concheyro, Andrea; Olivero, Eduardo Bernardo; Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 112; 12-2021; 1-15 0895-9811 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ AUSTRAL BASIN BIOSTRATIGRAPHY CALCAREOUS NANNOFOSSILS EOCENE/OLIGOCENE BOUNDARY TIERRA DEL FUEGO https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.jsames.2021.103581 2023-09-24T19:19:48Z This paper documents calcareous nannofossil assemblages and the bioevents recorded in the Austral basin of Tierra del Fuego, Argentina. Fifty samples from the type section of the Cerro Colorado Formation were analyzed. Nannoflora is moderately preserved and indicates a late Eocene to early Oligocene age for sedimentary rocks of this formation. Biostratigraphic results are based on distribution patterns of calcareous nannofossils assemblages, permitting comparison with the Southern Ocean zonations and some correlations with standard schemes. Our biostratigraphic interpretation shows an almost complete stratigraphic section spanning from the Priabonian to Rupelian Stages and calcareous nannofossil Chiasmolithus oamaruensis to Blackites spinosus zones, or the low latitude zones of Martini NP18 to NP21. The oldest fossiliferous rocks from the type locality of the Cerro Colorado Formation contain Chiasmolithus oamaruensis indicating nannofossil Zone NP18. The Eocene/Oligocene boundary was placed between the last occurrence (LO) of Reticulofenestra oamaruensis and the increasing in abundance (IB) of Reticulofenestra daviesii. Samples taken from the top of the section belong to the Estancia María Cristina Beds have Cyclicargolithus abisectus. During the late middle to late Eocene a hiatus is suggested between the Cerro Colorado and Leticia formations evident by a 39 Ma detrital zircon age dating, and the first occurrence (FO) of Dictyococcites bisectus. Furthermore, the presence of C. abisectus in the Estancia María Cristina Beds suggests an unconformity with the underlying Cerro Colorado Formation as previously inferred by stratigraphic relationships. Fil: Bedoya Agudelo, Erika Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Concheyro, Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos ... Article in Journal/Newspaper Southern Ocean Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina Austral Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Southern Ocean Journal of South American Earth Sciences 112 103581 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
AUSTRAL BASIN BIOSTRATIGRAPHY CALCAREOUS NANNOFOSSILS EOCENE/OLIGOCENE BOUNDARY TIERRA DEL FUEGO https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
AUSTRAL BASIN BIOSTRATIGRAPHY CALCAREOUS NANNOFOSSILS EOCENE/OLIGOCENE BOUNDARY TIERRA DEL FUEGO https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Bedoya Agudelo, Erika Lorena Concheyro, Andrea Olivero, Eduardo Bernardo Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
topic_facet |
AUSTRAL BASIN BIOSTRATIGRAPHY CALCAREOUS NANNOFOSSILS EOCENE/OLIGOCENE BOUNDARY TIERRA DEL FUEGO https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
This paper documents calcareous nannofossil assemblages and the bioevents recorded in the Austral basin of Tierra del Fuego, Argentina. Fifty samples from the type section of the Cerro Colorado Formation were analyzed. Nannoflora is moderately preserved and indicates a late Eocene to early Oligocene age for sedimentary rocks of this formation. Biostratigraphic results are based on distribution patterns of calcareous nannofossils assemblages, permitting comparison with the Southern Ocean zonations and some correlations with standard schemes. Our biostratigraphic interpretation shows an almost complete stratigraphic section spanning from the Priabonian to Rupelian Stages and calcareous nannofossil Chiasmolithus oamaruensis to Blackites spinosus zones, or the low latitude zones of Martini NP18 to NP21. The oldest fossiliferous rocks from the type locality of the Cerro Colorado Formation contain Chiasmolithus oamaruensis indicating nannofossil Zone NP18. The Eocene/Oligocene boundary was placed between the last occurrence (LO) of Reticulofenestra oamaruensis and the increasing in abundance (IB) of Reticulofenestra daviesii. Samples taken from the top of the section belong to the Estancia María Cristina Beds have Cyclicargolithus abisectus. During the late middle to late Eocene a hiatus is suggested between the Cerro Colorado and Leticia formations evident by a 39 Ma detrital zircon age dating, and the first occurrence (FO) of Dictyococcites bisectus. Furthermore, the presence of C. abisectus in the Estancia María Cristina Beds suggests an unconformity with the underlying Cerro Colorado Formation as previously inferred by stratigraphic relationships. Fil: Bedoya Agudelo, Erika Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Concheyro, Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos ... |
format |
Article in Journal/Newspaper |
author |
Bedoya Agudelo, Erika Lorena Concheyro, Andrea Olivero, Eduardo Bernardo |
author_facet |
Bedoya Agudelo, Erika Lorena Concheyro, Andrea Olivero, Eduardo Bernardo |
author_sort |
Bedoya Agudelo, Erika Lorena |
title |
Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
title_short |
Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
title_full |
Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
title_fullStr |
Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
title_full_unstemmed |
Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina |
title_sort |
late eocene to early oligocene calcareous nannofossil biostratigraphy of the cerro colorado formation, austral basin, argentina |
publisher |
Pergamon-Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/160060 |
long_lat |
ENVELOPE(-63.717,-63.717,-64.283,-64.283) |
geographic |
Argentina Austral Pablo Southern Ocean |
geographic_facet |
Argentina Austral Pablo Southern Ocean |
genre |
Southern Ocean Tierra del Fuego |
genre_facet |
Southern Ocean Tierra del Fuego |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2021.103581 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981121004272 http://hdl.handle.net/11336/160060 Bedoya Agudelo, Erika Lorena; Concheyro, Andrea; Olivero, Eduardo Bernardo; Late Eocene to early Oligocene calcareous nannofossil biostratigraphy of the Cerro Colorado Formation, Austral basin, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 112; 12-2021; 1-15 0895-9811 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.jsames.2021.103581 |
container_title |
Journal of South American Earth Sciences |
container_volume |
112 |
container_start_page |
103581 |
_version_ |
1779320463249375232 |