Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic)
The Gulf Stream, a western boundary current transporting warm water into the North Atlantic, plays a key role in climate regulation and oceanographic stability at a regional and global scale as part of the Atlantic Meridional Overturning Circulation (AMOC). Evidence suggests that an ancestral Gulf S...
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ftdoajarticles:oai:doaj.org/article:999fe3a7e24a4fb2949b267c7a8b6f0c 2024-09-15T18:22:30+00:00 Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) J. de Entrambasaguas T. Westerhold H. L. Jones L. Alegret 2024-08-01T00:00:00Z https://doi.org/10.5194/jm-43-303-2024 https://doaj.org/article/999fe3a7e24a4fb2949b267c7a8b6f0c EN eng Copernicus Publications https://jm.copernicus.org/articles/43/303/2024/jm-43-303-2024.pdf https://doaj.org/toc/0262-821X https://doaj.org/toc/2041-4978 doi:10.5194/jm-43-303-2024 0262-821X 2041-4978 https://doaj.org/article/999fe3a7e24a4fb2949b267c7a8b6f0c Journal of Micropalaeontology, Vol 43, Pp 303-322 (2024) Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.5194/jm-43-303-2024 2024-08-12T15:24:04Z The Gulf Stream, a western boundary current transporting warm water into the North Atlantic, plays a key role in climate regulation and oceanographic stability at a regional and global scale as part of the Atlantic Meridional Overturning Circulation (AMOC). Evidence suggests that an ancestral Gulf Stream has existed since the Mesozoic, and it has altered its course repeatedly over Cenozoic times. In this study, we focus on the upper Eocene (Priabonian, ca. 36 Ma) from Ocean Drilling Program Site 1053 on Blake Nose (subtropical North Atlantic). Bulk carbon and oxygen stable isotopes, as well as benthic foraminiferal and calcareous nannofossil assemblages, provide an integrated assessment of the palaeoceanographic changes impacting the area through the water column to the seafloor. Micropaleontological assemblages suggest changes in surface ocean stratification and nutrient supply to the seafloor coeval with a paired negative carbon and oxygen isotope excursion and the return to background conditions higher up in the study section. These transitory changes are compatible with the longitudinal displacement of the proto-Gulf Stream and its related eddies. Our results build on previous work and support the hypothesis that links palaeoceanographic changes in the Blake Nose area with shifts in the proto-Gulf Stream during the middle and late Eocene. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Journal of Micropalaeontology 43 2 303 322 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Geology QE1-996.5 |
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Geology QE1-996.5 J. de Entrambasaguas T. Westerhold H. L. Jones L. Alegret Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
topic_facet |
Geology QE1-996.5 |
description |
The Gulf Stream, a western boundary current transporting warm water into the North Atlantic, plays a key role in climate regulation and oceanographic stability at a regional and global scale as part of the Atlantic Meridional Overturning Circulation (AMOC). Evidence suggests that an ancestral Gulf Stream has existed since the Mesozoic, and it has altered its course repeatedly over Cenozoic times. In this study, we focus on the upper Eocene (Priabonian, ca. 36 Ma) from Ocean Drilling Program Site 1053 on Blake Nose (subtropical North Atlantic). Bulk carbon and oxygen stable isotopes, as well as benthic foraminiferal and calcareous nannofossil assemblages, provide an integrated assessment of the palaeoceanographic changes impacting the area through the water column to the seafloor. Micropaleontological assemblages suggest changes in surface ocean stratification and nutrient supply to the seafloor coeval with a paired negative carbon and oxygen isotope excursion and the return to background conditions higher up in the study section. These transitory changes are compatible with the longitudinal displacement of the proto-Gulf Stream and its related eddies. Our results build on previous work and support the hypothesis that links palaeoceanographic changes in the Blake Nose area with shifts in the proto-Gulf Stream during the middle and late Eocene. |
format |
Article in Journal/Newspaper |
author |
J. de Entrambasaguas T. Westerhold H. L. Jones L. Alegret |
author_facet |
J. de Entrambasaguas T. Westerhold H. L. Jones L. Alegret |
author_sort |
J. de Entrambasaguas |
title |
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
title_short |
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
title_full |
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
title_fullStr |
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
title_full_unstemmed |
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic) |
title_sort |
transient micropaleontological turnover across a late eocene (priabonian) carbon and oxygen isotope shift on blake nose (nw atlantic) |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/jm-43-303-2024 https://doaj.org/article/999fe3a7e24a4fb2949b267c7a8b6f0c |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Micropalaeontology, Vol 43, Pp 303-322 (2024) |
op_relation |
https://jm.copernicus.org/articles/43/303/2024/jm-43-303-2024.pdf https://doaj.org/toc/0262-821X https://doaj.org/toc/2041-4978 doi:10.5194/jm-43-303-2024 0262-821X 2041-4978 https://doaj.org/article/999fe3a7e24a4fb2949b267c7a8b6f0c |
op_doi |
https://doi.org/10.5194/jm-43-303-2024 |
container_title |
Journal of Micropalaeontology |
container_volume |
43 |
container_issue |
2 |
container_start_page |
303 |
op_container_end_page |
322 |
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1810462367747670016 |