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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Geological Society of London
2016
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ftdatacite:10.6084/m9.figshare.3452822.v1 2023-05-15T17:13:52+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 https://dx.doi.org/10.6084/m9.figshare.3452822.v1 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822/1 unknown Geological Society of London https://dx.doi.org/10.1144/0262-821x10-008 https://dx.doi.org/10.6084/m9.figshare.3452822 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences dataset Dataset 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3452822.v1 https://doi.org/10.1144/0262-821x10-008 https://doi.org/10.6084/m9.figshare.3452822 2021-11-05T12:55:41Z 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 DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences 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 FOS Earth and related environmental sciences |
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 |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3452822.v1 https://figshare.com/articles/Distribution_of_deep-sea_benthic_foraminifera_in_the_Neogene_of_Blake_Ridge_NW_Atlantic_Ocean/3452822/1 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://dx.doi.org/10.1144/0262-821x10-008 https://dx.doi.org/10.6084/m9.figshare.3452822 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3452822.v1 https://doi.org/10.1144/0262-821x10-008 https://doi.org/10.6084/m9.figshare.3452822 |
_version_ |
1766071059685048320 |