Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences
ABSTRACT: Paleogene calcareous nannoplankton evolution with regard to morphotype changes was analysed. The^°0/1"0 ratio in planktonic foraminifera tests was studied. Conclusions about surface water temperature and salinity changes and about main features of surface circulation based on these da...
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ftunisalamanojs:oai:ojs.pkp.sfu.ca:article/3875 2023-05-15T14:05:02+02:00 Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences Ushakova, Maola Blyum, Natalia 2009-11-24 application/pdf https://revistas.usal.es/index.php/0211-8327/article/view/3875 spa spa Studia Geologica Salmanticensia https://revistas.usal.es/index.php/0211-8327/article/view/3875/3890 https://revistas.usal.es/index.php/0211-8327/article/view/3875 Studia Geologica Salmanticensia; Vol. 31 (1995) 0211-8327 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2009 ftunisalamanojs 2022-05-12T20:02:44Z ABSTRACT: Paleogene calcareous nannoplankton evolution with regard to morphotype changes was analysed. The^°0/1"0 ratio in planktonic foraminifera tests was studied. Conclusions about surface water temperature and salinity changes and about main features of surface circulation based on these data were arrived. Can be seen that the reformation from the mainly halinotypic circulation of the early Paleogene into halotherme one took place in the middle Eocene. In the same time the notable climatic zonation appeared. In connection with the beginning of Antarctic glaciation and climatic cooling during the late Eocene and Oligocène existed mixed halotherme - thermohalinic circulation. Since the middle of Miocene the thermotypic circulation became increase.RESUMEN: Se analiza la evolución del nannoplancton calcáreo paleógeno, especialmente sus cambios morfotípicos. Se estudia la relación l°O/l"0 en las conchas de foraminíferos planctónicos. Se obtienen conclusiones sobre cambios de temperatura del agua superficial y de salinidad y algunas características de la circulación superficial. Parece que el cambio, desde la circulación principalmente halinotópica del Paleógeno inferior a la halotérmica, tuvo lugar en el Eoceno medio. En ese tiempo aparece una marcada zonación climática. Coincidiendo con el comienzo de la glaciación antartica y el enfriamiento climático, durante el Eoceno superior y el Oligoceno, se dio una combinación de circulaciones halotérmica - termohalina. Hacia la mitad del Mioceno se incrementa la circulación termotípica. Article in Journal/Newspaper Antarc* Antarctic antartic* Planktonic foraminifera Universidad de Salamanca: Gestor Revistas Online Antarctic Tuvo ENVELOPE(13.782,13.782,67.054,67.054) |
institution |
Open Polar |
collection |
Universidad de Salamanca: Gestor Revistas Online |
op_collection_id |
ftunisalamanojs |
language |
Spanish |
description |
ABSTRACT: Paleogene calcareous nannoplankton evolution with regard to morphotype changes was analysed. The^°0/1"0 ratio in planktonic foraminifera tests was studied. Conclusions about surface water temperature and salinity changes and about main features of surface circulation based on these data were arrived. Can be seen that the reformation from the mainly halinotypic circulation of the early Paleogene into halotherme one took place in the middle Eocene. In the same time the notable climatic zonation appeared. In connection with the beginning of Antarctic glaciation and climatic cooling during the late Eocene and Oligocène existed mixed halotherme - thermohalinic circulation. Since the middle of Miocene the thermotypic circulation became increase.RESUMEN: Se analiza la evolución del nannoplancton calcáreo paleógeno, especialmente sus cambios morfotípicos. Se estudia la relación l°O/l"0 en las conchas de foraminíferos planctónicos. Se obtienen conclusiones sobre cambios de temperatura del agua superficial y de salinidad y algunas características de la circulación superficial. Parece que el cambio, desde la circulación principalmente halinotópica del Paleógeno inferior a la halotérmica, tuvo lugar en el Eoceno medio. En ese tiempo aparece una marcada zonación climática. Coincidiendo con el comienzo de la glaciación antartica y el enfriamiento climático, durante el Eoceno superior y el Oligoceno, se dio una combinación de circulaciones halotérmica - termohalina. Hacia la mitad del Mioceno se incrementa la circulación termotípica. |
format |
Article in Journal/Newspaper |
author |
Ushakova, Maola Blyum, Natalia |
spellingShingle |
Ushakova, Maola Blyum, Natalia Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
author_facet |
Ushakova, Maola Blyum, Natalia |
author_sort |
Ushakova, Maola |
title |
Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
title_short |
Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
title_full |
Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
title_fullStr |
Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
title_full_unstemmed |
Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
title_sort |
reformation of the surface oceanic circulation during paleogene: calcareous nannoplanktonic, foraminiferal and oxygen isotopic evidences |
publisher |
Studia Geologica Salmanticensia |
publishDate |
2009 |
url |
https://revistas.usal.es/index.php/0211-8327/article/view/3875 |
long_lat |
ENVELOPE(13.782,13.782,67.054,67.054) |
geographic |
Antarctic Tuvo |
geographic_facet |
Antarctic Tuvo |
genre |
Antarc* Antarctic antartic* Planktonic foraminifera |
genre_facet |
Antarc* Antarctic antartic* Planktonic foraminifera |
op_source |
Studia Geologica Salmanticensia; Vol. 31 (1995) 0211-8327 |
op_relation |
https://revistas.usal.es/index.php/0211-8327/article/view/3875/3890 https://revistas.usal.es/index.php/0211-8327/article/view/3875 |
_version_ |
1766276670265753600 |