Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic
First and last occurrences of 389 diatom species from the first global Cenozoic record are used to reconstruct the position of major oceanographic boundaries. First appearances and extinctions group in three latitudinal bands: middle to high northern latitudes, equatorial region, and high southern l...
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ftiowastateuniv:oai:lib.dr.iastate.edu:ge_at_pubs-1001 2023-05-15T14:03:05+02:00 Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic Cervato, Cinzia Burckle, Lloyd 2003-01-01T08:00:00Z application/pdf https://lib.dr.iastate.edu/ge_at_pubs/4 https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1001&context=ge_at_pubs en eng Iowa State University Digital Repository https://lib.dr.iastate.edu/ge_at_pubs/4 https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1001&context=ge_at_pubs An edited version of this paper was published by AGU. Copyright 2003 American Geophysical Union. Geological and Atmospheric Sciences Publications diatoms evolution paleoceanography oceanographic boundaries Antarctic polar front Cenozoic Geology Oceanography and Atmospheric Sciences and Meteorology text 2003 ftiowastateuniv 2018-11-25T22:53:22Z First and last occurrences of 389 diatom species from the first global Cenozoic record are used to reconstruct the position of major oceanographic boundaries. First appearances and extinctions group in three latitudinal bands: middle to high northern latitudes, equatorial region, and high southern latitudes. Sparse Paleogene occurrences were limited to southern high latitudes along the equivalent of the modern Antarctic polar front. Its late middle Eocene to middle Miocene position varied within 10°, and within a 20° band from middle Miocene to present, suggesting an association with global cooling. First and last occurrence events appear in the two remaining latitudinal regions during the Eocene and increase in a stepwise fashion, mimicking significant cooling events. At about 16 Ma, first and last appearances shift from the North Atlantic to the North Pacific. Low-latitude data suggest low surface water productivity prior to 40 Ma, while increased abundance from the middle Miocene correlates with expansion of the east Antarctic Ice Sheet. Text Antarc* Antarctic Ice Sheet North Atlantic Digital Repository @ Iowa State University Antarctic East Antarctic Ice Sheet Pacific |
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Open Polar |
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Digital Repository @ Iowa State University |
op_collection_id |
ftiowastateuniv |
language |
English |
topic |
diatoms evolution paleoceanography oceanographic boundaries Antarctic polar front Cenozoic Geology Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
diatoms evolution paleoceanography oceanographic boundaries Antarctic polar front Cenozoic Geology Oceanography and Atmospheric Sciences and Meteorology Cervato, Cinzia Burckle, Lloyd Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
topic_facet |
diatoms evolution paleoceanography oceanographic boundaries Antarctic polar front Cenozoic Geology Oceanography and Atmospheric Sciences and Meteorology |
description |
First and last occurrences of 389 diatom species from the first global Cenozoic record are used to reconstruct the position of major oceanographic boundaries. First appearances and extinctions group in three latitudinal bands: middle to high northern latitudes, equatorial region, and high southern latitudes. Sparse Paleogene occurrences were limited to southern high latitudes along the equivalent of the modern Antarctic polar front. Its late middle Eocene to middle Miocene position varied within 10°, and within a 20° band from middle Miocene to present, suggesting an association with global cooling. First and last occurrence events appear in the two remaining latitudinal regions during the Eocene and increase in a stepwise fashion, mimicking significant cooling events. At about 16 Ma, first and last appearances shift from the North Atlantic to the North Pacific. Low-latitude data suggest low surface water productivity prior to 40 Ma, while increased abundance from the middle Miocene correlates with expansion of the east Antarctic Ice Sheet. |
format |
Text |
author |
Cervato, Cinzia Burckle, Lloyd |
author_facet |
Cervato, Cinzia Burckle, Lloyd |
author_sort |
Cervato, Cinzia |
title |
Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
title_short |
Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
title_full |
Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
title_fullStr |
Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
title_full_unstemmed |
Pattern of first and last appearance in diatoms: Oceanic circulation and the position of polar fronts during the Cenozoic |
title_sort |
pattern of first and last appearance in diatoms: oceanic circulation and the position of polar fronts during the cenozoic |
publisher |
Iowa State University Digital Repository |
publishDate |
2003 |
url |
https://lib.dr.iastate.edu/ge_at_pubs/4 https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1001&context=ge_at_pubs |
geographic |
Antarctic East Antarctic Ice Sheet Pacific |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific |
genre |
Antarc* Antarctic Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic |
op_source |
Geological and Atmospheric Sciences Publications |
op_relation |
https://lib.dr.iastate.edu/ge_at_pubs/4 https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1001&context=ge_at_pubs |
op_rights |
An edited version of this paper was published by AGU. Copyright 2003 American Geophysical Union. |
_version_ |
1766273614641889280 |