Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic)
Within the last decade, several early Eocene hyperthermals have been detected globally. These transient warming events have mainly been characterized geochemically - using stable isotopes, carbonate content measurements or XRF core scanning - yet detailed micropaleontological records are sparse, lim...
Published in: | Marine Micropaleontology |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier Scientific Pub. Co.
2012
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Online Access: | https://lirias.kuleuven.be/handle/123456789/334643 https://doi.org/10.1016/j.marmicro.2012.02.006 https://lirias.kuleuven.be/bitstream/123456789/334643/2//2012,+D%27haenens.pdf https://lirias.kuleuven.be/bitstream/123456789/334643/3//Dhaenens_et_al_2012_p1%28Eocene-hyperthermals_MarMic%29.pdf |
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ftunivleuven:oai:lirias.kuleuven.be:123456789/334643 2023-05-15T17:41:43+02:00 Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) D'haenens, Simon Bornemann, Andre Stassen, Peter Speijer, Robert 2012-05 https://lirias.kuleuven.be/handle/123456789/334643 https://doi.org/10.1016/j.marmicro.2012.02.006 https://lirias.kuleuven.be/bitstream/123456789/334643/2//2012,+D%27haenens.pdf https://lirias.kuleuven.be/bitstream/123456789/334643/3//Dhaenens_et_al_2012_p1%28Eocene-hyperthermals_MarMic%29.pdf en eng Elsevier Scientific Pub. Co. Marine Micropaleontology vol:88-89 pages:15-35 https://lirias.kuleuven.be/handle/123456789/334643 0377-8398 doi:10.1016/j.marmicro.2012.02.006 1872-6186 https://lirias.kuleuven.be/bitstream/123456789/334643/2//2012,+D%27haenens.pdf https://lirias.kuleuven.be/bitstream/123456789/334643/3//Dhaenens_et_al_2012_p1%28Eocene-hyperthermals_MarMic%29.pdf 180980;intranet 212857;public Article IT 212857;Article 180980;Article 2012 ftunivleuven https://doi.org/10.1016/j.marmicro.2012.02.006 2017-06-02T19:21:32Z Within the last decade, several early Eocene hyperthermals have been detected globally. These transient warming events have mainly been characterized geochemically - using stable isotopes, carbonate content measurements or XRF core scanning - yet detailed micropaleontological records are sparse, limiting our understanding of the driving forces behind hyperthermals and of the contemporaneous paleoceanography. Here, detailed geochemical and quantitative benthic foraminiferal records are presented from lower Eocene pelagic sediments of Deep Sea Drilling Project Site 401 (Bay of Biscay, northeast Atlantic). In calcareous nannofossil zone NP11, several clay-enriched levels correspond to negative δ13C and δ18O bulk-rock excursions with amplitudes of up to ~ 0.75‰, suggesting that significant injections of 12 C-enriched greenhouse gases and small temperature rises took place. Coeval with several of these hyperthermal events, the benthic foraminiferal record reveals increased relative abundances of oligotrophic taxa (e.g. Nuttallides umbonifera) and a reduction in the abundance of buliminid species followed by an increase of opportunistic taxa (e.g. Globocassidulina subglobosa and Gyroidinoides spp.). These short-lived faunal perturbations are thought to be caused by reduced seasonality of productivity resulting in a decreased Corg flux to the seafloor. Moreover, the sedimentological record suggests that an enhanced influx of terrigenous material occurred during these events. Additionally, the most intense δ13C decline (here called level δ) gives rise to a small, yet pronounced long-term shift in the benthic foraminiferal composition at this site, possibly due to the reappraisal of upwelling and the intensification of bottom water currents. These observations imply that environmental changes during (smaller) hyperthermal events are also reflected in the composition of deep-sea benthic communities on both short (< 100 kyr) and longer time scales. We conclude that the faunal patterns of the hyperthermals observed at Site 401 strongly resemble those observed in other deep-sea early Paleogene hyperthermal deposits, suggesting that similar processes have driven them. status: published Article in Journal/Newspaper Northeast Atlantic KU Leuven: Lirias Marine Micropaleontology 88-89 15 35 |
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Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
description |
Within the last decade, several early Eocene hyperthermals have been detected globally. These transient warming events have mainly been characterized geochemically - using stable isotopes, carbonate content measurements or XRF core scanning - yet detailed micropaleontological records are sparse, limiting our understanding of the driving forces behind hyperthermals and of the contemporaneous paleoceanography. Here, detailed geochemical and quantitative benthic foraminiferal records are presented from lower Eocene pelagic sediments of Deep Sea Drilling Project Site 401 (Bay of Biscay, northeast Atlantic). In calcareous nannofossil zone NP11, several clay-enriched levels correspond to negative δ13C and δ18O bulk-rock excursions with amplitudes of up to ~ 0.75‰, suggesting that significant injections of 12 C-enriched greenhouse gases and small temperature rises took place. Coeval with several of these hyperthermal events, the benthic foraminiferal record reveals increased relative abundances of oligotrophic taxa (e.g. Nuttallides umbonifera) and a reduction in the abundance of buliminid species followed by an increase of opportunistic taxa (e.g. Globocassidulina subglobosa and Gyroidinoides spp.). These short-lived faunal perturbations are thought to be caused by reduced seasonality of productivity resulting in a decreased Corg flux to the seafloor. Moreover, the sedimentological record suggests that an enhanced influx of terrigenous material occurred during these events. Additionally, the most intense δ13C decline (here called level δ) gives rise to a small, yet pronounced long-term shift in the benthic foraminiferal composition at this site, possibly due to the reappraisal of upwelling and the intensification of bottom water currents. These observations imply that environmental changes during (smaller) hyperthermal events are also reflected in the composition of deep-sea benthic communities on both short (< 100 kyr) and longer time scales. We conclude that the faunal patterns of the hyperthermals observed at Site 401 strongly resemble those observed in other deep-sea early Paleogene hyperthermal deposits, suggesting that similar processes have driven them. status: published |
format |
Article in Journal/Newspaper |
author |
D'haenens, Simon Bornemann, Andre Stassen, Peter Speijer, Robert |
spellingShingle |
D'haenens, Simon Bornemann, Andre Stassen, Peter Speijer, Robert Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
author_facet |
D'haenens, Simon Bornemann, Andre Stassen, Peter Speijer, Robert |
author_sort |
D'haenens, Simon |
title |
Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
title_short |
Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
title_full |
Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
title_fullStr |
Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
title_full_unstemmed |
Multiple early Eocene benthic foraminiferal assemblage and δ13C fluctuations at DSDP Site 401 (Bay of Biscay – NE Atlantic) |
title_sort |
multiple early eocene benthic foraminiferal assemblage and δ13c fluctuations at dsdp site 401 (bay of biscay – ne atlantic) |
publisher |
Elsevier Scientific Pub. Co. |
publishDate |
2012 |
url |
https://lirias.kuleuven.be/handle/123456789/334643 https://doi.org/10.1016/j.marmicro.2012.02.006 https://lirias.kuleuven.be/bitstream/123456789/334643/2//2012,+D%27haenens.pdf https://lirias.kuleuven.be/bitstream/123456789/334643/3//Dhaenens_et_al_2012_p1%28Eocene-hyperthermals_MarMic%29.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
Marine Micropaleontology vol:88-89 pages:15-35 https://lirias.kuleuven.be/handle/123456789/334643 0377-8398 doi:10.1016/j.marmicro.2012.02.006 1872-6186 https://lirias.kuleuven.be/bitstream/123456789/334643/2//2012,+D%27haenens.pdf https://lirias.kuleuven.be/bitstream/123456789/334643/3//Dhaenens_et_al_2012_p1%28Eocene-hyperthermals_MarMic%29.pdf |
op_rights |
180980;intranet 212857;public |
op_doi |
https://doi.org/10.1016/j.marmicro.2012.02.006 |
container_title |
Marine Micropaleontology |
container_volume |
88-89 |
container_start_page |
15 |
op_container_end_page |
35 |
_version_ |
1766143425551269888 |