Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments

Autores
Daners, G.; Rodriguez Amenabar, Cecilia; Alperin, Marta Ines; Guerstein, Gladys Raquel
Año de publicación
2022
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Eocene was a time of regional tectonic events and climatological changes, related to the opening of the Drake Passage that separated South America from Antarctica. Knowledge of the timing of the Drake rifting can help us understand the new oceanographic regime and its consequences. In this sense, dinoflagellate cysts (dinocysts) are useful tools for biostratigraphy and palaeoceanographic reconstructions. For this purpose, we analyzed dinocyst assemblages from lithostratigraphic units adjacent to the Drake Passage, including the Man Aike (MA), the Upper Member of the Río Turbio (umRT) and Leticia (Le) formations, outcropping in the Austral-Magallanes Basin, southern Patagonia, and the La Meseta Formation (LM), from the James Ross Basin, Antarctica. Our quantitative information of the dinocyst assemblages of the aforementioned units together with the recently published radiometric data were taken into account to update the biostratigraphic scheme for the Austral-Magallanes Basin, adjusting the ages of the dinocyst biozones and bioevents proposed for the umRT. The statistical compositional analysis of the quantitative dinocyst assemblages performed in this work allowed us to confirm the correlation of the formations, showing a high equivalence between the middle Eocene (Bartonian, 41 ˗ 37 Ma) assemblages (lower part of the umRT, MA, Le and LM) separating from the late Eocene (< 36 Ma) ones (upper part of the umRT). In addition, the statistical results revealed different palaeoenvironments. While the Bartonian assemblages represent relatively warm waters in inland shelf environments, those of the Priabonian indicated coastal areas with cold, nutrient-rich surface waters.
Fil: Daners, G.. Universidad de la Republica Montevideo; Uruguay
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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Cátedra de Paleontología; Argentina
Fil: Alperin, Marta Ines. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
Fil: Guerstein, Gladys Raquel. 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
3rd Palaeontological Virtual Congress
Argentina
Palaeontological Society
Materia
DINOCYSTS
EOCENE
PATAGONIA
ANTARCTIC PENINSULA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/221083
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironmentsDaners, G.Rodriguez Amenabar, CeciliaAlperin, Marta InesGuerstein, Gladys RaquelDINOCYSTSEOCENEPATAGONIAANTARCTIC PENINSULAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Eocene was a time of regional tectonic events and climatological changes, related to the opening of the Drake Passage that separated South America from Antarctica. Knowledge of the timing of the Drake rifting can help us understand the new oceanographic regime and its consequences. In this sense, dinoflagellate cysts (dinocysts) are useful tools for biostratigraphy and palaeoceanographic reconstructions. For this purpose, we analyzed dinocyst assemblages from lithostratigraphic units adjacent to the Drake Passage, including the Man Aike (MA), the Upper Member of the Río Turbio (umRT) and Leticia (Le) formations, outcropping in the Austral-Magallanes Basin, southern Patagonia, and the La Meseta Formation (LM), from the James Ross Basin, Antarctica. Our quantitative information of the dinocyst assemblages of the aforementioned units together with the recently published radiometric data were taken into account to update the biostratigraphic scheme for the Austral-Magallanes Basin, adjusting the ages of the dinocyst biozones and bioevents proposed for the umRT. The statistical compositional analysis of the quantitative dinocyst assemblages performed in this work allowed us to confirm the correlation of the formations, showing a high equivalence between the middle Eocene (Bartonian, 41 ˗ 37 Ma) assemblages (lower part of the umRT, MA, Le and LM) separating from the late Eocene (< 36 Ma) ones (upper part of the umRT). In addition, the statistical results revealed different palaeoenvironments. While the Bartonian assemblages represent relatively warm waters in inland shelf environments, those of the Priabonian indicated coastal areas with cold, nutrient-rich surface waters.Fil: Daners, G.. Universidad de la Republica Montevideo; UruguayFil: 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Cátedra de Paleontología; ArgentinaFil: Alperin, Marta Ines. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; ArgentinaFil: Guerstein, Gladys Raquel. 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; Argentina3rd Palaeontological Virtual CongressArgentinaPalaeontological SocietyPalaeontological Society2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/221083Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments; 3rd Palaeontological Virtual Congress; Argentina; 2021; 78-78CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://palaeovc.org/index.php/downloads/Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:22:32Zoai:ri.conicet.gov.ar:11336/221083instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:22:33.057CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
title Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
spellingShingle Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
Daners, G.
DINOCYSTS
EOCENE
PATAGONIA
ANTARCTIC PENINSULA
title_short Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
title_full Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
title_fullStr Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
title_full_unstemmed Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
title_sort Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments
dc.creator.none.fl_str_mv Daners, G.
Rodriguez Amenabar, Cecilia
Alperin, Marta Ines
Guerstein, Gladys Raquel
author Daners, G.
author_facet Daners, G.
Rodriguez Amenabar, Cecilia
Alperin, Marta Ines
Guerstein, Gladys Raquel
author_role author
author2 Rodriguez Amenabar, Cecilia
Alperin, Marta Ines
Guerstein, Gladys Raquel
author2_role author
author
author
dc.subject.none.fl_str_mv DINOCYSTS
EOCENE
PATAGONIA
ANTARCTIC PENINSULA
topic DINOCYSTS
EOCENE
PATAGONIA
ANTARCTIC PENINSULA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Eocene was a time of regional tectonic events and climatological changes, related to the opening of the Drake Passage that separated South America from Antarctica. Knowledge of the timing of the Drake rifting can help us understand the new oceanographic regime and its consequences. In this sense, dinoflagellate cysts (dinocysts) are useful tools for biostratigraphy and palaeoceanographic reconstructions. For this purpose, we analyzed dinocyst assemblages from lithostratigraphic units adjacent to the Drake Passage, including the Man Aike (MA), the Upper Member of the Río Turbio (umRT) and Leticia (Le) formations, outcropping in the Austral-Magallanes Basin, southern Patagonia, and the La Meseta Formation (LM), from the James Ross Basin, Antarctica. Our quantitative information of the dinocyst assemblages of the aforementioned units together with the recently published radiometric data were taken into account to update the biostratigraphic scheme for the Austral-Magallanes Basin, adjusting the ages of the dinocyst biozones and bioevents proposed for the umRT. The statistical compositional analysis of the quantitative dinocyst assemblages performed in this work allowed us to confirm the correlation of the formations, showing a high equivalence between the middle Eocene (Bartonian, 41 ˗ 37 Ma) assemblages (lower part of the umRT, MA, Le and LM) separating from the late Eocene (< 36 Ma) ones (upper part of the umRT). In addition, the statistical results revealed different palaeoenvironments. While the Bartonian assemblages represent relatively warm waters in inland shelf environments, those of the Priabonian indicated coastal areas with cold, nutrient-rich surface waters.
Fil: Daners, G.. Universidad de la Republica Montevideo; Uruguay
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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Cátedra de Paleontología; Argentina
Fil: Alperin, Marta Ines. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
Fil: Guerstein, Gladys Raquel. 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
3rd Palaeontological Virtual Congress
Argentina
Palaeontological Society
description The Eocene was a time of regional tectonic events and climatological changes, related to the opening of the Drake Passage that separated South America from Antarctica. Knowledge of the timing of the Drake rifting can help us understand the new oceanographic regime and its consequences. In this sense, dinoflagellate cysts (dinocysts) are useful tools for biostratigraphy and palaeoceanographic reconstructions. For this purpose, we analyzed dinocyst assemblages from lithostratigraphic units adjacent to the Drake Passage, including the Man Aike (MA), the Upper Member of the Río Turbio (umRT) and Leticia (Le) formations, outcropping in the Austral-Magallanes Basin, southern Patagonia, and the La Meseta Formation (LM), from the James Ross Basin, Antarctica. Our quantitative information of the dinocyst assemblages of the aforementioned units together with the recently published radiometric data were taken into account to update the biostratigraphic scheme for the Austral-Magallanes Basin, adjusting the ages of the dinocyst biozones and bioevents proposed for the umRT. The statistical compositional analysis of the quantitative dinocyst assemblages performed in this work allowed us to confirm the correlation of the formations, showing a high equivalence between the middle Eocene (Bartonian, 41 ˗ 37 Ma) assemblages (lower part of the umRT, MA, Le and LM) separating from the late Eocene (< 36 Ma) ones (upper part of the umRT). In addition, the statistical results revealed different palaeoenvironments. While the Bartonian assemblages represent relatively warm waters in inland shelf environments, those of the Priabonian indicated coastal areas with cold, nutrient-rich surface waters.
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/221083
Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments; 3rd Palaeontological Virtual Congress; Argentina; 2021; 78-78
CONICET Digital
CONICET
url http://hdl.handle.net/11336/221083
identifier_str_mv Eocene southern Atlantic Ocean dinoflagellate cysts: regional correlation and paleoenvironments; 3rd Palaeontological Virtual Congress; Argentina; 2021; 78-78
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://palaeovc.org/index.php/downloads/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Palaeontological Society
publisher.none.fl_str_mv Palaeontological Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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