Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida
The present paper deals with the palynomorph content in the López de Bertodano and Sobral Formations, cropping out on Vicecomodoro Marambio (Seymour) Island, Antarctica. In the López de Bertodano Fm., marine phytoplankton is dominant, but Nothofagidites spp (mainly "brassi" type), podocarp...
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Language: | Spanish |
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Universidade de São Paulo. Instituto de Geociências
1986
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Online Access: | https://www.revistas.usp.br/bigsc/article/view/45057 |
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ftunivsaopojs:oai:revistas.usp.br:article/45057 2023-05-15T14:03:26+02:00 Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida Baldoni, Alicia M Barreda, Viviana 1986-01-01 application/pdf https://www.revistas.usp.br/bigsc/article/view/45057 spa spa Universidade de São Paulo. Instituto de Geociências https://www.revistas.usp.br/bigsc/article/view/45057/48669 https://www.revistas.usp.br/bigsc/article/view/45057 Boletim IG-USP. Série Científica; v. 17 (1986); 89-96 2316-8986 0102-6283 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1986 ftunivsaopojs 2022-08-23T01:05:14Z The present paper deals with the palynomorph content in the López de Bertodano and Sobral Formations, cropping out on Vicecomodoro Marambio (Seymour) Island, Antarctica. In the López de Bertodano Fm., marine phytoplankton is dominant, but Nothofagidites spp (mainly "brassi" type), podocarpaceous species (Podocarpidites, Microcachrydites, Phyllocladidites and Dacrydiumites), some proteaceous pollen and pteridophyte spores (Perotrilites, Lycopodiumsporites, Laevigatosporites, Baculatisporites and Azolla sp.) are also present. The dominant palynomorphs in the lower part of the Sobral Formation are dinoflagellates, accompanied by a poor assemblage composed of Nothofagidites sp., proteaceous pollen and pteridophyte spores. The continental association is more frequent in the middle part of the sequences; in this same levei the best development of the podocarpaceous group is registered. Recycled palynomorphs of Permian? age are present in both formations. The palynological content of the López de Bertodano and Sobral Formations was compared with those of the Cerro Dorotea (Maastrichtian-Paleocene), Bororó (Paleocene), Salamanca (Paleocene), Rio Chico (Paleocene) and Rio Turbio (Eocene) Formations from Argentina and with those of the Rio Blanco (Maastrichtian), Cheuquemó (Eocene) and Loreto (Eocene-Oligocene) Formations from Chile, and it was concluded that the López de Bertodano Formation has practically no exclusive elements in common with the units under consideration, while the Sobral Formation presents the greatest number of resemblances with the Rio Turbio Formation. Finally, the different groups represented in the units were treated statistically. A clear marine advance, indicated by an increase of paleomicroplankton, was evident at the base of the Sobral Formation. As far as continental representatives are concerned, spores have quite an even distribution in ali the sequence, even though there is a slight predominance in the López de Bertodano Formation and at the base of the Sobral Formation; gymnosperms show, ... Article in Journal/Newspaper Antarc* Antarctica Antártida Seymour Island Universidade de São Paulo: Portal de Revistas da USP Argentina Blanco ENVELOPE(-55.233,-55.233,-61.250,-61.250) Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Sobral ENVELOPE(-40.650,-40.650,-81.083,-81.083) Sobral isla ENVELOPE(-62.933,-62.933,-64.333,-64.333) Boletim IG-USP. Série Científica 17 0 89 |
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Open Polar |
collection |
Universidade de São Paulo: Portal de Revistas da USP |
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ftunivsaopojs |
language |
Spanish |
description |
The present paper deals with the palynomorph content in the López de Bertodano and Sobral Formations, cropping out on Vicecomodoro Marambio (Seymour) Island, Antarctica. In the López de Bertodano Fm., marine phytoplankton is dominant, but Nothofagidites spp (mainly "brassi" type), podocarpaceous species (Podocarpidites, Microcachrydites, Phyllocladidites and Dacrydiumites), some proteaceous pollen and pteridophyte spores (Perotrilites, Lycopodiumsporites, Laevigatosporites, Baculatisporites and Azolla sp.) are also present. The dominant palynomorphs in the lower part of the Sobral Formation are dinoflagellates, accompanied by a poor assemblage composed of Nothofagidites sp., proteaceous pollen and pteridophyte spores. The continental association is more frequent in the middle part of the sequences; in this same levei the best development of the podocarpaceous group is registered. Recycled palynomorphs of Permian? age are present in both formations. The palynological content of the López de Bertodano and Sobral Formations was compared with those of the Cerro Dorotea (Maastrichtian-Paleocene), Bororó (Paleocene), Salamanca (Paleocene), Rio Chico (Paleocene) and Rio Turbio (Eocene) Formations from Argentina and with those of the Rio Blanco (Maastrichtian), Cheuquemó (Eocene) and Loreto (Eocene-Oligocene) Formations from Chile, and it was concluded that the López de Bertodano Formation has practically no exclusive elements in common with the units under consideration, while the Sobral Formation presents the greatest number of resemblances with the Rio Turbio Formation. Finally, the different groups represented in the units were treated statistically. A clear marine advance, indicated by an increase of paleomicroplankton, was evident at the base of the Sobral Formation. As far as continental representatives are concerned, spores have quite an even distribution in ali the sequence, even though there is a slight predominance in the López de Bertodano Formation and at the base of the Sobral Formation; gymnosperms show, ... |
format |
Article in Journal/Newspaper |
author |
Baldoni, Alicia M Barreda, Viviana |
spellingShingle |
Baldoni, Alicia M Barreda, Viviana Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
author_facet |
Baldoni, Alicia M Barreda, Viviana |
author_sort |
Baldoni, Alicia M |
title |
Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
title_short |
Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
title_full |
Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
title_fullStr |
Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
title_full_unstemmed |
Estúdio palinológico de las formaciones Lõpez de Bertodano y sobral, Isla Vicecomodoro Marambio, Antártida |
title_sort |
estúdio palinológico de las formaciones lõpez de bertodano y sobral, isla vicecomodoro marambio, antártida |
publisher |
Universidade de São Paulo. Instituto de Geociências |
publishDate |
1986 |
url |
https://www.revistas.usp.br/bigsc/article/view/45057 |
long_lat |
ENVELOPE(-55.233,-55.233,-61.250,-61.250) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-40.650,-40.650,-81.083,-81.083) ENVELOPE(-62.933,-62.933,-64.333,-64.333) |
geographic |
Argentina Blanco Marambio Seymour Seymour Island Sobral Sobral isla |
geographic_facet |
Argentina Blanco Marambio Seymour Seymour Island Sobral Sobral isla |
genre |
Antarc* Antarctica Antártida Seymour Island |
genre_facet |
Antarc* Antarctica Antártida Seymour Island |
op_source |
Boletim IG-USP. Série Científica; v. 17 (1986); 89-96 2316-8986 0102-6283 |
op_relation |
https://www.revistas.usp.br/bigsc/article/view/45057/48669 https://www.revistas.usp.br/bigsc/article/view/45057 |
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Boletim IG-USP. Série Científica |
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