Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean
Turborotalita quinqueloba is a species of planktic foraminifera commonly found in the sub-polar North Atlantic along the pathway of Atlantic waters in the Nordic seas and sometimes even in the Arctic Ocean, although its occurrence there remains poorly understood. Existing data show that T. quinquelo...
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Online Access: | https://doi.org/10.3389/feart.2019.00071 https://doaj.org/article/f09eced7d3e041dfb541e50820f086f7 |
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ftdoajarticles:oai:doaj.org/article:f09eced7d3e041dfb541e50820f086f7 2023-05-15T14:48:26+02:00 Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean Matt O’Regan Helen K. Coxall Thomas M. Cronin Richard Gyllencreutz Martin Jakobsson Stefanie Kaboth Ludvig Löwemark Steffen Wiers Gabriel West 2019-04-01T00:00:00Z https://doi.org/10.3389/feart.2019.00071 https://doaj.org/article/f09eced7d3e041dfb541e50820f086f7 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/feart.2019.00071/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2019.00071 https://doaj.org/article/f09eced7d3e041dfb541e50820f086f7 Frontiers in Earth Science, Vol 7 (2019) Arctic Ocean Lomonosov Ridge Pleistocene chronology lithostratigraphy planktonic foraminifera Science Q article 2019 ftdoajarticles https://doi.org/10.3389/feart.2019.00071 2023-01-08T01:31:25Z Turborotalita quinqueloba is a species of planktic foraminifera commonly found in the sub-polar North Atlantic along the pathway of Atlantic waters in the Nordic seas and sometimes even in the Arctic Ocean, although its occurrence there remains poorly understood. Existing data show that T. quinqueloba is scarce in Holocene sediments from the central Arctic but abundance levels increase in sediments from the last interglacial period [Marine isotope stage (MIS) 5, 71–120 ka] in cores off the northern coast of Greenland and the southern Mendeleev Ridge. Turborotalita also occurs in earlier Pleistocene interglacials in these regions, with a unique and widespread occurrence of the less known Turborotalita egelida morphotype, proposed as a biostratigraphic marker for MIS 11 (474–374 ka). Here we present results from six new sediment cores, extending from the central to western Lomonosov Ridge, that show a consistent Pleistocene stratigraphy over 575 km. Preliminary semi-quantitative assessments of planktic foraminifer abundance and assemblage composition in two of these records (LOMROG12-7PC and AO16-5PC) reveal two distinct stratigraphic horizons containing Turborotalita in MIS 5. Earlier occurrences in Pleistocene interglacials are recognized, but contain significantly fewer specimens and do not appear to be stratigraphically coeval in the studied sequences. In all instances, the Turborotalita specimens resemble the typical T. quinqueloba morphotype but are smaller (63–125 μm), smooth-walled and lack the final thickened calcite layer common to adults of the species. These results extend the geographical range for T. quinqueloba in MIS 5 sediments of the Arctic Ocean and provide compelling evidence for recurrent invasions during Pleistocene interglacials. Article in Journal/Newspaper Arctic Arctic Ocean Foraminifera* Greenland Lomonosov Ridge Nordic Seas North Atlantic Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Greenland Frontiers in Earth Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic Ocean Lomonosov Ridge Pleistocene chronology lithostratigraphy planktonic foraminifera Science Q |
spellingShingle |
Arctic Ocean Lomonosov Ridge Pleistocene chronology lithostratigraphy planktonic foraminifera Science Q Matt O’Regan Helen K. Coxall Thomas M. Cronin Richard Gyllencreutz Martin Jakobsson Stefanie Kaboth Ludvig Löwemark Steffen Wiers Gabriel West Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
topic_facet |
Arctic Ocean Lomonosov Ridge Pleistocene chronology lithostratigraphy planktonic foraminifera Science Q |
description |
Turborotalita quinqueloba is a species of planktic foraminifera commonly found in the sub-polar North Atlantic along the pathway of Atlantic waters in the Nordic seas and sometimes even in the Arctic Ocean, although its occurrence there remains poorly understood. Existing data show that T. quinqueloba is scarce in Holocene sediments from the central Arctic but abundance levels increase in sediments from the last interglacial period [Marine isotope stage (MIS) 5, 71–120 ka] in cores off the northern coast of Greenland and the southern Mendeleev Ridge. Turborotalita also occurs in earlier Pleistocene interglacials in these regions, with a unique and widespread occurrence of the less known Turborotalita egelida morphotype, proposed as a biostratigraphic marker for MIS 11 (474–374 ka). Here we present results from six new sediment cores, extending from the central to western Lomonosov Ridge, that show a consistent Pleistocene stratigraphy over 575 km. Preliminary semi-quantitative assessments of planktic foraminifer abundance and assemblage composition in two of these records (LOMROG12-7PC and AO16-5PC) reveal two distinct stratigraphic horizons containing Turborotalita in MIS 5. Earlier occurrences in Pleistocene interglacials are recognized, but contain significantly fewer specimens and do not appear to be stratigraphically coeval in the studied sequences. In all instances, the Turborotalita specimens resemble the typical T. quinqueloba morphotype but are smaller (63–125 μm), smooth-walled and lack the final thickened calcite layer common to adults of the species. These results extend the geographical range for T. quinqueloba in MIS 5 sediments of the Arctic Ocean and provide compelling evidence for recurrent invasions during Pleistocene interglacials. |
format |
Article in Journal/Newspaper |
author |
Matt O’Regan Helen K. Coxall Thomas M. Cronin Richard Gyllencreutz Martin Jakobsson Stefanie Kaboth Ludvig Löwemark Steffen Wiers Gabriel West |
author_facet |
Matt O’Regan Helen K. Coxall Thomas M. Cronin Richard Gyllencreutz Martin Jakobsson Stefanie Kaboth Ludvig Löwemark Steffen Wiers Gabriel West |
author_sort |
Matt O’Regan |
title |
Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
title_short |
Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
title_full |
Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
title_fullStr |
Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
title_full_unstemmed |
Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean |
title_sort |
stratigraphic occurrences of sub-polar planktic foraminifera in pleistocene sediments on the lomonosov ridge, arctic ocean |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/feart.2019.00071 https://doaj.org/article/f09eced7d3e041dfb541e50820f086f7 |
geographic |
Arctic Arctic Ocean Greenland |
geographic_facet |
Arctic Arctic Ocean Greenland |
genre |
Arctic Arctic Ocean Foraminifera* Greenland Lomonosov Ridge Nordic Seas North Atlantic Planktonic foraminifera |
genre_facet |
Arctic Arctic Ocean Foraminifera* Greenland Lomonosov Ridge Nordic Seas North Atlantic Planktonic foraminifera |
op_source |
Frontiers in Earth Science, Vol 7 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/feart.2019.00071/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2019.00071 https://doaj.org/article/f09eced7d3e041dfb541e50820f086f7 |
op_doi |
https://doi.org/10.3389/feart.2019.00071 |
container_title |
Frontiers in Earth Science |
container_volume |
7 |
_version_ |
1766319502568456192 |