Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation
The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the s...
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ftconicet:oai:ri.conicet.gov.ar:11336/64650 2023-10-09T21:47:14+02:00 Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation González Estebenet, María Sol Guerstein, Gladys Raquel Rodriguez Raising, Martin Eduardo Ponce, Juan Jose Alperin, Marta Ines application/pdf http://hdl.handle.net/11336/64650 eng eng Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.1017/S0016756816000601 info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/geological-magazine/article/dinoflagellate-cyst-zonation-for-the-middle-to-upper-eocene-in-the-austral-basin-southwestern-atlantic-ocean-implications-for-regional-and-global-correlation/BC56112B9E9743460AE3E047A2165F63 http://hdl.handle.net/11336/64650 González Estebenet, María Sol; Guerstein, Gladys Raquel; Rodriguez Raising, Martin Eduardo; Ponce, Juan Jose; Alperin, Marta Ines; Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation; Cambridge University Press; Geological Magazine; 154; 5; 9-2017; 1022-1036 0016-7568 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ARGENTINA AUSTRAL BASIN BIOSTRATIGRAPHY DINOFLAGELLATE CYST EOCENE PALAEOENVIRONMENT 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/10.1017/S0016756816000601 2023-09-24T20:20:47Z The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic-Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway). Fil: González Estebenet, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina Fil: Guerstein, Gladys Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Austral Patagonia Drake Passage Pacific Argentina Geological Magazine 154 5 1022 1036 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ARGENTINA AUSTRAL BASIN BIOSTRATIGRAPHY DINOFLAGELLATE CYST EOCENE PALAEOENVIRONMENT https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
ARGENTINA AUSTRAL BASIN BIOSTRATIGRAPHY DINOFLAGELLATE CYST EOCENE PALAEOENVIRONMENT https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 González Estebenet, María Sol Guerstein, Gladys Raquel Rodriguez Raising, Martin Eduardo Ponce, Juan Jose Alperin, Marta Ines Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
topic_facet |
ARGENTINA AUSTRAL BASIN BIOSTRATIGRAPHY DINOFLAGELLATE CYST EOCENE PALAEOENVIRONMENT https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The well-exposed marine Eocene units from southwestern Patagonia, Argentina, contain useful information for reconstructing regional climate and oceanographic patterns in an area adjacent to the Drake Passage. The aim of this paper is to integrate dinoflagellate cyst data from three sections of the southwestern Austral Basin (Río Turbio Formation) to propose a zonation scheme, which can be applied to other southwestern Atlantic Ocean sites. Assemblages of organic walled dinoflagellate cysts have been analysed in different cropping-out sections and cores, showing the high potential of this fossil group as biostratigraphic markers. Comparison of dinoflagellate cyst events of the upper member of the Río Turbio Formation with calibrated biostratigraphic ranges in the Palaeogene South Pacific Ocean allowed us to date and correlate these sedimentary sections. The resulting zonation consists of four dinoflagellate cyst zones labelled RTF 1 to RTF 4, between the middle Lutetian and late Priabonian. As a final point, we applied dinoflagellate cyst species with importance as palaeoenvironmental markers to assess long-term climatic and oceanographic evolution for the area. This study shows that the endemic-Antarctic dinoflagellate cyst assemblage is dominant during the middle to late Eocene (RTF 1 to RTF 3), while a significant replacement of these taxa by cosmopolitan species characterizes the upper part of the upper member of the Río Turbio Formation (RTF 4). This turnover seems to be a consequence of changes in the ocean circulation patterns forced by deepening of the southern Atlantic gateways (the Drake Passage and the Tasman Gateway). Fil: González Estebenet, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina Fil: Guerstein, Gladys Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico ... |
format |
Article in Journal/Newspaper |
author |
González Estebenet, María Sol Guerstein, Gladys Raquel Rodriguez Raising, Martin Eduardo Ponce, Juan Jose Alperin, Marta Ines |
author_facet |
González Estebenet, María Sol Guerstein, Gladys Raquel Rodriguez Raising, Martin Eduardo Ponce, Juan Jose Alperin, Marta Ines |
author_sort |
González Estebenet, María Sol |
title |
Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
title_short |
Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
title_full |
Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
title_fullStr |
Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
title_full_unstemmed |
Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation |
title_sort |
dinoflagellate cyst zonation for the middle to upper eocene in the austral basin, southwestern atlantic ocean: implications for regional and global correlation |
publisher |
Cambridge University Press |
url |
http://hdl.handle.net/11336/64650 |
geographic |
Antarctic Austral Patagonia Drake Passage Pacific Argentina |
geographic_facet |
Antarctic Austral Patagonia Drake Passage Pacific Argentina |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/S0016756816000601 info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/geological-magazine/article/dinoflagellate-cyst-zonation-for-the-middle-to-upper-eocene-in-the-austral-basin-southwestern-atlantic-ocean-implications-for-regional-and-global-correlation/BC56112B9E9743460AE3E047A2165F63 http://hdl.handle.net/11336/64650 González Estebenet, María Sol; Guerstein, Gladys Raquel; Rodriguez Raising, Martin Eduardo; Ponce, Juan Jose; Alperin, Marta Ines; Dinoflagellate cyst zonation for the middle to upper Eocene in the Austral Basin, southwestern Atlantic Ocean: Implications for regional and global correlation; Cambridge University Press; Geological Magazine; 154; 5; 9-2017; 1022-1036 0016-7568 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/10.1017/S0016756816000601 |
container_title |
Geological Magazine |
container_volume |
154 |
container_issue |
5 |
container_start_page |
1022 |
op_container_end_page |
1036 |
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1779310185655828480 |