Barium in sediments off northwest Africa
High-resolution down-core analyses of the solid phase content of total barium (Batot) and total organic carbon (TOC) back to 25 kyr B.P. were performed on a gravity core from the upper continental slope off Cape Yubi (Morocco). The observed discrepancy between the two potential paleoproductivity pro...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.738379 2023-05-15T17:35:58+02:00 Barium in sediments off northwest Africa Plewa, Kerstin Meggers, Helge Kasten, Sabine LATITUDE: 27.536695 * LONGITUDE: -13.736695 * DATE/TIME START: 1998-10-15T11:01:00 * DATE/TIME END: 2003-05-21T09:17:00 2006-05-26 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.738379 https://doi.org/10.1594/PANGAEA.738379 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.738379 https://doi.org/10.1594/PANGAEA.738379 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Plewa, Kerstin; Meggers, Helge; Kasten, Sabine (2006): Barium in sediments off NW Africa: A tracer for paleoproductivity or meltwater events? Paleoceanography, 21(2), PA2015, https://doi.org/10.1029/2005PA001136 273 Center for Marine Environmental Sciences GeoB GeoB5546-2 GeoB8613-6 Geosciences University of Bremen Gravity corer (Kiel type) KL M42/4b M58/2 MARUM Meteor (1986) off Northwest Africa Piston corer (BGR type) SL Dataset 2006 ftpangaea https://doi.org/10.1594/PANGAEA.738379 https://doi.org/10.1029/2005PA001136 2023-01-20T07:31:48Z High-resolution down-core analyses of the solid phase content of total barium (Batot) and total organic carbon (TOC) back to 25 kyr B.P. were performed on a gravity core from the upper continental slope off Cape Yubi (Morocco). The observed discrepancy between the two potential paleoproductivity proxies, Batot and TOC, initiated supplementary examinations of the pore water, the geochemistry of the clay fraction, X-ray diffraction analyses, and the application of a sequential Ba extraction method of selected samples. Additionally, we analyzed down-core samples of the planktonic foraminifera Turborotalita quinqueloba and Globorotalia inflata for their Ba/Ca ratios. These analyses, which were performed for the first time on these species, were used to reconstruct past oceanic Ba concentrations. We suggest that in the study area, which is characterized by high accumulation rates, the preserved TOC content is a valuable proxy for past primary productivity, whereas the solid phase Batot contents appear to be affected by other mechanisms and factors. Peaks of total barium content in the clay fraction and of Ba/Ca ratios in the planktonic foraminifera shells found during the Younger Dryas and the Heinrich 1 event are likely to result from increased meltwater influx into the northern North Atlantic. We suggest that Ba-enriched meltwater was transmitted by the eastern boundary current system from higher latitudes to the region of the Canary Islands. Total barium contents of the clay fraction (Batot,clay) and Ba/Ca in planktonic foraminifera shells seem to be reliable proxies for this discharge of meltwater. Dataset North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-13.736695,-13.736695,27.536695,27.536695) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
273 Center for Marine Environmental Sciences GeoB GeoB5546-2 GeoB8613-6 Geosciences University of Bremen Gravity corer (Kiel type) KL M42/4b M58/2 MARUM Meteor (1986) off Northwest Africa Piston corer (BGR type) SL |
spellingShingle |
273 Center for Marine Environmental Sciences GeoB GeoB5546-2 GeoB8613-6 Geosciences University of Bremen Gravity corer (Kiel type) KL M42/4b M58/2 MARUM Meteor (1986) off Northwest Africa Piston corer (BGR type) SL Plewa, Kerstin Meggers, Helge Kasten, Sabine Barium in sediments off northwest Africa |
topic_facet |
273 Center for Marine Environmental Sciences GeoB GeoB5546-2 GeoB8613-6 Geosciences University of Bremen Gravity corer (Kiel type) KL M42/4b M58/2 MARUM Meteor (1986) off Northwest Africa Piston corer (BGR type) SL |
description |
High-resolution down-core analyses of the solid phase content of total barium (Batot) and total organic carbon (TOC) back to 25 kyr B.P. were performed on a gravity core from the upper continental slope off Cape Yubi (Morocco). The observed discrepancy between the two potential paleoproductivity proxies, Batot and TOC, initiated supplementary examinations of the pore water, the geochemistry of the clay fraction, X-ray diffraction analyses, and the application of a sequential Ba extraction method of selected samples. Additionally, we analyzed down-core samples of the planktonic foraminifera Turborotalita quinqueloba and Globorotalia inflata for their Ba/Ca ratios. These analyses, which were performed for the first time on these species, were used to reconstruct past oceanic Ba concentrations. We suggest that in the study area, which is characterized by high accumulation rates, the preserved TOC content is a valuable proxy for past primary productivity, whereas the solid phase Batot contents appear to be affected by other mechanisms and factors. Peaks of total barium content in the clay fraction and of Ba/Ca ratios in the planktonic foraminifera shells found during the Younger Dryas and the Heinrich 1 event are likely to result from increased meltwater influx into the northern North Atlantic. We suggest that Ba-enriched meltwater was transmitted by the eastern boundary current system from higher latitudes to the region of the Canary Islands. Total barium contents of the clay fraction (Batot,clay) and Ba/Ca in planktonic foraminifera shells seem to be reliable proxies for this discharge of meltwater. |
format |
Dataset |
author |
Plewa, Kerstin Meggers, Helge Kasten, Sabine |
author_facet |
Plewa, Kerstin Meggers, Helge Kasten, Sabine |
author_sort |
Plewa, Kerstin |
title |
Barium in sediments off northwest Africa |
title_short |
Barium in sediments off northwest Africa |
title_full |
Barium in sediments off northwest Africa |
title_fullStr |
Barium in sediments off northwest Africa |
title_full_unstemmed |
Barium in sediments off northwest Africa |
title_sort |
barium in sediments off northwest africa |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.738379 https://doi.org/10.1594/PANGAEA.738379 |
op_coverage |
LATITUDE: 27.536695 * LONGITUDE: -13.736695 * DATE/TIME START: 1998-10-15T11:01:00 * DATE/TIME END: 2003-05-21T09:17:00 |
long_lat |
ENVELOPE(-13.736695,-13.736695,27.536695,27.536695) |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Plewa, Kerstin; Meggers, Helge; Kasten, Sabine (2006): Barium in sediments off NW Africa: A tracer for paleoproductivity or meltwater events? Paleoceanography, 21(2), PA2015, https://doi.org/10.1029/2005PA001136 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.738379 https://doi.org/10.1594/PANGAEA.738379 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.738379 https://doi.org/10.1029/2005PA001136 |
_version_ |
1766135277294714880 |