Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean
This study describes and illustrates the evolution of deep-sea benthic foraminifera from the Blake Ridge during the late Neogene. In total, 305 species of benthic foraminifera belonging to 107 genera were identified. The Blake Ridge receives fine-grained nannofossil-bearing hemipelagic sediments, tr...
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ftgeosoclonfig:oai:figshare.com:article/3452822 2023-05-15T17:13:51+02:00 Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean KUPPUSAMY MOHAN ANIL K. GUPTA AJOY K. BHAUMIK 2016-06-21T10:19:05Z https://doi.org/10.6084/m9.figshare.3452822 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822 unknown doi:10.6084/m9.figshare.3452822 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822 CC BY 4.0 CC-BY Geology DWBUC benthic foraminifera sediment sites benthic faunal assemblages Ma Blake Ridge region Blake Ridge NADW ODP North Atlantic Deep Water Southern Component Waters species diversity NW Atlantic Ocean Ocean Drilling Program Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3452822 2020-02-21T07:24:41Z This study describes and illustrates the evolution of deep-sea benthic foraminifera from the Blake Ridge during the late Neogene. In total, 305 species of benthic foraminifera belonging to 107 genera were identified. The Blake Ridge receives fine-grained nannofossil-bearing hemipelagic sediments, transported from the Canadian continental margin by the Deep Western Boundary Undercurrent (DWBUC). We thus presume that changes in benthic foraminifera at Ocean Drilling Program (ODP) sites 991A, 994C, 995A and B and 997A reflect mainly changes in the intensity of the DWBUC, which is closely related to North Atlantic Deep Water (NADW) production. However, the dominance of Uvigerina peregrina , U. proboscidea and Cassidulina carinata during the late Miocene in all the holes suggests an increased influence of Southern Component Waters in the Blake Ridge region. During the early Pliocene (4.8–2.8 Ma) in all the sites benthic faunal assemblages suggest that there was an increased transport of organic-rich sediments by the DWBUC from the Canadian margin to the Blake Ridge, driven by increased production of NADW. During this time the species diversity (Sanders' rarefied values) was low. In the younger interval (since 2.8 Ma), the faunal data suggest less transport of organic-rich sediments to the Blake Ridge, which appears to be related to weakening of the DWBUC during cold intervals. An increase in species diversity at 3 Ma probably resulted from decreased population of bacteria due to low organic matter and/or less competition. In the late Pleistocene ( c . 0.6 Ma), Stilostomella lepidula became extinct in all the studied holes, suggesting that this species may have possessed a mode of feeding which no longer existed in the cold, well-oxygenated oceans of the present. Dataset NADW North Atlantic Deep Water North Atlantic Geological Society of London: Figshare |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology DWBUC benthic foraminifera sediment sites benthic faunal assemblages Ma Blake Ridge region Blake Ridge NADW ODP North Atlantic Deep Water Southern Component Waters species diversity NW Atlantic Ocean Ocean Drilling Program |
spellingShingle |
Geology DWBUC benthic foraminifera sediment sites benthic faunal assemblages Ma Blake Ridge region Blake Ridge NADW ODP North Atlantic Deep Water Southern Component Waters species diversity NW Atlantic Ocean Ocean Drilling Program KUPPUSAMY MOHAN ANIL K. GUPTA AJOY K. BHAUMIK Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
topic_facet |
Geology DWBUC benthic foraminifera sediment sites benthic faunal assemblages Ma Blake Ridge region Blake Ridge NADW ODP North Atlantic Deep Water Southern Component Waters species diversity NW Atlantic Ocean Ocean Drilling Program |
description |
This study describes and illustrates the evolution of deep-sea benthic foraminifera from the Blake Ridge during the late Neogene. In total, 305 species of benthic foraminifera belonging to 107 genera were identified. The Blake Ridge receives fine-grained nannofossil-bearing hemipelagic sediments, transported from the Canadian continental margin by the Deep Western Boundary Undercurrent (DWBUC). We thus presume that changes in benthic foraminifera at Ocean Drilling Program (ODP) sites 991A, 994C, 995A and B and 997A reflect mainly changes in the intensity of the DWBUC, which is closely related to North Atlantic Deep Water (NADW) production. However, the dominance of Uvigerina peregrina , U. proboscidea and Cassidulina carinata during the late Miocene in all the holes suggests an increased influence of Southern Component Waters in the Blake Ridge region. During the early Pliocene (4.8–2.8 Ma) in all the sites benthic faunal assemblages suggest that there was an increased transport of organic-rich sediments by the DWBUC from the Canadian margin to the Blake Ridge, driven by increased production of NADW. During this time the species diversity (Sanders' rarefied values) was low. In the younger interval (since 2.8 Ma), the faunal data suggest less transport of organic-rich sediments to the Blake Ridge, which appears to be related to weakening of the DWBUC during cold intervals. An increase in species diversity at 3 Ma probably resulted from decreased population of bacteria due to low organic matter and/or less competition. In the late Pleistocene ( c . 0.6 Ma), Stilostomella lepidula became extinct in all the studied holes, suggesting that this species may have possessed a mode of feeding which no longer existed in the cold, well-oxygenated oceans of the present. |
format |
Dataset |
author |
KUPPUSAMY MOHAN ANIL K. GUPTA AJOY K. BHAUMIK |
author_facet |
KUPPUSAMY MOHAN ANIL K. GUPTA AJOY K. BHAUMIK |
author_sort |
KUPPUSAMY MOHAN |
title |
Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
title_short |
Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
title_full |
Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
title_fullStr |
Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
title_full_unstemmed |
Distribution of deep-sea benthic foraminifera in the Neogene of Blake Ridge, NW Atlantic Ocean |
title_sort |
distribution of deep-sea benthic foraminifera in the neogene of blake ridge, nw atlantic ocean |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3452822 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
doi:10.6084/m9.figshare.3452822 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3452822 |
_version_ |
1766071035664269312 |