Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment
Dinoflagellate cyst assemblages recovered from the La Meseta Formation cropping out in Seymour Island, Antarctic Peninsula, are studied herein and their distribution is compared with the biostratigraphic scheme available for the Palaeogene of the Southern Ocean and other high-latitude regions. In th...
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Language: | English |
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Cambridge University Press
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Online Access: | http://hdl.handle.net/11336/97402 |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
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English |
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ANTARCTICA BIOSTRATIGRAPHY EOCENE PALAEOENVIRONMENT PALYNOMORPHS SOUTHERN OCEAN CIRCULATION https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
ANTARCTICA BIOSTRATIGRAPHY EOCENE PALAEOENVIRONMENT PALYNOMORPHS SOUTHERN OCEAN CIRCULATION https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Rodriguez Amenabar, Cecilia Montes, Manuel Nozal, Francisco Santillana, Sergio Nestor Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
topic_facet |
ANTARCTICA BIOSTRATIGRAPHY EOCENE PALAEOENVIRONMENT PALYNOMORPHS SOUTHERN OCEAN CIRCULATION https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Dinoflagellate cyst assemblages recovered from the La Meseta Formation cropping out in Seymour Island, Antarctic Peninsula, are studied herein and their distribution is compared with the biostratigraphic scheme available for the Palaeogene of the Southern Ocean and other high-latitude regions. In this way, the La Meseta Formation is dated as middle Lutetian to Priabonian (46.2-36 Ma), which differs from the age provided by other fossils, isotopes and also with the magnetostratigraphic scheme recently performed for the unit. The dinoflagellate cyst data support the proposal of ocean circulation patterns on the South American Shelf prior to the opening of Drake Passage. Assemblages from the La Meseta Formation contain Antarctic-endemic taxa which are also dominant in several circum-Antarctic sites, located south of 45° S. Their distribution reflects an ocean-circulation scheme with wide clockwise gyres surrounding Antarctica that were disrupted as a consequence of the deepening and definitive apertures of the Tasmanian Gateway and Drake Passage towards the Eocene/Oligocene transition. The palaeoenvironmental inference based on the S/D ratio (sporomorphs versus dinoflagellate cysts) and the P/G ratio (peridinioid versus gonyaulacoid dinoflagellate cysts) suggests an overall trend through the section from marine-dominated assemblages with poorly productive waters in the lower part of the section to more terrestrially dominated assemblages with increasing productivity in the upper part of the unit, reflecting a shallowing trend to the top. Fil: Rodriguez Amenabar, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina Fil: ... |
format |
Article in Journal/Newspaper |
author |
Rodriguez Amenabar, Cecilia Montes, Manuel Nozal, Francisco Santillana, Sergio Nestor |
author_facet |
Rodriguez Amenabar, Cecilia Montes, Manuel Nozal, Francisco Santillana, Sergio Nestor |
author_sort |
Rodriguez Amenabar, Cecilia |
title |
Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
title_short |
Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
title_full |
Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
title_fullStr |
Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
title_full_unstemmed |
Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment |
title_sort |
dinoflagellate cysts of the la meseta formation (middle to late eocene), antarctic peninsula: implications for biostratigraphy, palaeoceanography and palaeoenvironment |
publisher |
Cambridge University Press |
url |
http://hdl.handle.net/11336/97402 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.720,-56.720,-63.529,-63.529) ENVELOPE(-63.717,-63.717,-64.283,-64.283) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Drake Passage Argentino Argentina Seymour Seymour Island Rodriguez Pablo |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Drake Passage Argentino Argentina Seymour Seymour Island Rodriguez Pablo |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Drake Passage Instituto Antártico Argentino Seymour Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Drake Passage Instituto Antártico Argentino Seymour Island Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/geological-magazine/article/dinoflagellate-cysts-of-the-la-meseta-formation-middle-to-late-eocene-antarctic-peninsula-implications-for-biostratigraphy-palaeoceanography-and-palaeoenvironment/287492E8DED4A6DF079D8C41D1B6151B info:eu-repo/semantics/altIdentifier/doi/10.1017/S0016756819000591 http://hdl.handle.net/11336/97402 Rodriguez Amenabar, Cecilia; Montes, Manuel; Nozal, Francisco; Santillana, Sergio Nestor; Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment; Cambridge University Press; Geological Magazine; 7-2019; 1-16 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/S0016756819000591 |
container_title |
Geological Magazine |
container_volume |
157 |
container_issue |
3 |
container_start_page |
351 |
op_container_end_page |
366 |
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1779317420530335744 |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/97402 2023-10-09T21:45:18+02:00 Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment Rodriguez Amenabar, Cecilia Montes, Manuel Nozal, Francisco Santillana, Sergio Nestor application/pdf http://hdl.handle.net/11336/97402 eng eng Cambridge University Press info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/geological-magazine/article/dinoflagellate-cysts-of-the-la-meseta-formation-middle-to-late-eocene-antarctic-peninsula-implications-for-biostratigraphy-palaeoceanography-and-palaeoenvironment/287492E8DED4A6DF079D8C41D1B6151B info:eu-repo/semantics/altIdentifier/doi/10.1017/S0016756819000591 http://hdl.handle.net/11336/97402 Rodriguez Amenabar, Cecilia; Montes, Manuel; Nozal, Francisco; Santillana, Sergio Nestor; Dinoflagellate cysts of the la Meseta Formation (middle to late Eocene), Antarctic Peninsula: Implications for biostratigraphy, palaeoceanography and palaeoenvironment; Cambridge University Press; Geological Magazine; 7-2019; 1-16 0016-7568 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ANTARCTICA BIOSTRATIGRAPHY EOCENE PALAEOENVIRONMENT PALYNOMORPHS SOUTHERN OCEAN CIRCULATION 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/S0016756819000591 2023-09-24T20:22:33Z Dinoflagellate cyst assemblages recovered from the La Meseta Formation cropping out in Seymour Island, Antarctic Peninsula, are studied herein and their distribution is compared with the biostratigraphic scheme available for the Palaeogene of the Southern Ocean and other high-latitude regions. In this way, the La Meseta Formation is dated as middle Lutetian to Priabonian (46.2-36 Ma), which differs from the age provided by other fossils, isotopes and also with the magnetostratigraphic scheme recently performed for the unit. The dinoflagellate cyst data support the proposal of ocean circulation patterns on the South American Shelf prior to the opening of Drake Passage. Assemblages from the La Meseta Formation contain Antarctic-endemic taxa which are also dominant in several circum-Antarctic sites, located south of 45° S. Their distribution reflects an ocean-circulation scheme with wide clockwise gyres surrounding Antarctica that were disrupted as a consequence of the deepening and definitive apertures of the Tasmanian Gateway and Drake Passage towards the Eocene/Oligocene transition. The palaeoenvironmental inference based on the S/D ratio (sporomorphs versus dinoflagellate cysts) and the P/G ratio (peridinioid versus gonyaulacoid dinoflagellate cysts) suggests an overall trend through the section from marine-dominated assemblages with poorly productive waters in the lower part of the section to more terrestrially dominated assemblages with increasing productivity in the upper part of the unit, reflecting a shallowing trend to the top. Fil: Rodriguez Amenabar, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina Fil: ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Dirección Nacional del Antártico Drake Passage Instituto Antártico Argentino Seymour Island Southern Ocean CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Southern Ocean Antarctic Peninsula Drake Passage Argentino Argentina Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Rodriguez ENVELOPE(-56.720,-56.720,-63.529,-63.529) Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Geological Magazine 157 3 351 366 |