Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials
Limited constraints on the variability of the deep-water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detrital carbonates were repeatedly deposited in the Labrador Sea...
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ftoceanrep:oai:oceanrep.geomar.de:57835 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Limited constraints on the variability of the deep-water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detrital carbonates were repeatedly deposited in the Labrador Sea during the last 32 kyr, potentially affecting radiogenic Nd isotope signatures. To investigate this the Nd isotope compositions of deep and intermediate waters were extracted from the authigenic Fe-Mn oxyhydroxide fraction, foraminiferal coatings, the residual silicates and leachates of dolostone grains. We provide a first order estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. During the Last Glacial Maximum the Nd isotope signatures in the Labrador Sea would allow active water mass mixing with more radiogenic ɛNd values (-12.6 and -14) prevailing in its eastern part whereas less radiogenic values (ɛNd ∼ -18.4) were found on the western Labrador slope. The deposition of detrital carbonates during Heinrich stadials (2,1) was accompanied by negative detrital and authigenic Nd isotope excursions (ɛNd ∼ -31) that were likely controlled by dissolution of dolostone or dolostone associated mineral inclusions. This highly unradiogenic signal dominated the authigenic phases and individual water masses in the Labrador Sea, serving as potential source of highly unradiogenic Nd to the North Atlantic region, while exported southward. The Holocene authigenic ɛNd signatures of the coatings and leachates significantly differed from those of the detrital silicates, approaching modern bottom water mass signatures during the Late Holocene. Key Points - Estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea - Dissolution of detrital dolostones in the water column during Heinrich stadials at least partially controlled ɛNd signatures - During the LGM generally more ... |
format |
Article in Journal/Newspaper |
author |
Filippova, Alexandra Frank, Martin Kienast, Markus Gutjahr, Marcus Hathorne, Ed C. Hillaire‐Marcel, Claude |
spellingShingle |
Filippova, Alexandra Frank, Martin Kienast, Markus Gutjahr, Marcus Hathorne, Ed C. Hillaire‐Marcel, Claude Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
author_facet |
Filippova, Alexandra Frank, Martin Kienast, Markus Gutjahr, Marcus Hathorne, Ed C. Hillaire‐Marcel, Claude |
author_sort |
Filippova, Alexandra |
title |
Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
title_short |
Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
title_full |
Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
title_fullStr |
Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
title_full_unstemmed |
Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials |
title_sort |
authigenic and detrital carbonate nd isotope records reflect pulses of detrital material input to the labrador sea during the heinrich stadials |
publisher |
AGU (American Geophysical Union) |
publishDate |
2023 |
url |
https://oceanrep.geomar.de/id/eprint/57835/ https://oceanrep.geomar.de/id/eprint/57835/1/Paleoceanog%20and%20Paleoclimatol%20-%202023%20-%20Filippova%20-%20Authigenic%20and%20detrital%20carbonate%20Nd%20isotope%20records%20reflect%20pulses%20of.pdf https://oceanrep.geomar.de/id/eprint/57835/2/2022pa004470-sup-0001-supporting%20information%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/3/2022pa004470-sup-0002-table%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/4/2022pa004470-sup-0003-table%20si-s02.xlsx https://oceanrep.geomar.de/id/eprint/57835/5/2022pa004470-sup-0004-table%20si-s03.xlsx https://oceanrep.geomar.de/id/eprint/57835/6/2022pa004470-sup-0005-table%20si-s04.xlsx https://oceanrep.geomar.de/id/eprint/57835/7/2022pa004470-sup-0006-table%20si-s05.xlsx https://doi.org/10.1029/2022PA004470 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/57835/1/Paleoceanog%20and%20Paleoclimatol%20-%202023%20-%20Filippova%20-%20Authigenic%20and%20detrital%20carbonate%20Nd%20isotope%20records%20reflect%20pulses%20of.pdf https://oceanrep.geomar.de/id/eprint/57835/2/2022pa004470-sup-0001-supporting%20information%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/3/2022pa004470-sup-0002-table%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/4/2022pa004470-sup-0003-table%20si-s02.xlsx https://oceanrep.geomar.de/id/eprint/57835/5/2022pa004470-sup-0004-table%20si-s03.xlsx https://oceanrep.geomar.de/id/eprint/57835/6/2022pa004470-sup-0005-table%20si-s04.xlsx https://oceanrep.geomar.de/id/eprint/57835/7/2022pa004470-sup-0006-table%20si-s05.xlsx Filippova, A., Frank, M. , Kienast, M., Gutjahr, M. , Hathorne, E. C. and Hillaire‐Marcel, C. (2023) Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials. Open Access Paleoceanography and Paleoclimatology, 38 (2). e2022PA004470. DOI 10.1029/2022PA004470 <https://doi.org/10.1029/2022PA004470>. doi:10.1029/2022PA004470 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2022PA004470 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
38 |
container_issue |
2 |
_version_ |
1790602677597503488 |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:57835 2024-02-11T10:05:35+01:00 Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials Filippova, Alexandra Frank, Martin Kienast, Markus Gutjahr, Marcus Hathorne, Ed C. Hillaire‐Marcel, Claude 2023-02 text https://oceanrep.geomar.de/id/eprint/57835/ https://oceanrep.geomar.de/id/eprint/57835/1/Paleoceanog%20and%20Paleoclimatol%20-%202023%20-%20Filippova%20-%20Authigenic%20and%20detrital%20carbonate%20Nd%20isotope%20records%20reflect%20pulses%20of.pdf https://oceanrep.geomar.de/id/eprint/57835/2/2022pa004470-sup-0001-supporting%20information%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/3/2022pa004470-sup-0002-table%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/4/2022pa004470-sup-0003-table%20si-s02.xlsx https://oceanrep.geomar.de/id/eprint/57835/5/2022pa004470-sup-0004-table%20si-s03.xlsx https://oceanrep.geomar.de/id/eprint/57835/6/2022pa004470-sup-0005-table%20si-s04.xlsx https://oceanrep.geomar.de/id/eprint/57835/7/2022pa004470-sup-0006-table%20si-s05.xlsx https://doi.org/10.1029/2022PA004470 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/57835/1/Paleoceanog%20and%20Paleoclimatol%20-%202023%20-%20Filippova%20-%20Authigenic%20and%20detrital%20carbonate%20Nd%20isotope%20records%20reflect%20pulses%20of.pdf https://oceanrep.geomar.de/id/eprint/57835/2/2022pa004470-sup-0001-supporting%20information%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/3/2022pa004470-sup-0002-table%20si-s01.pdf https://oceanrep.geomar.de/id/eprint/57835/4/2022pa004470-sup-0003-table%20si-s02.xlsx https://oceanrep.geomar.de/id/eprint/57835/5/2022pa004470-sup-0004-table%20si-s03.xlsx https://oceanrep.geomar.de/id/eprint/57835/6/2022pa004470-sup-0005-table%20si-s04.xlsx https://oceanrep.geomar.de/id/eprint/57835/7/2022pa004470-sup-0006-table%20si-s05.xlsx Filippova, A., Frank, M. , Kienast, M., Gutjahr, M. , Hathorne, E. C. and Hillaire‐Marcel, C. (2023) Authigenic and detrital carbonate Nd isotope records reflect pulses of detrital material input to the Labrador Sea during the Heinrich Stadials. Open Access Paleoceanography and Paleoclimatology, 38 (2). e2022PA004470. DOI 10.1029/2022PA004470 <https://doi.org/10.1029/2022PA004470>. doi:10.1029/2022PA004470 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2023 ftoceanrep https://doi.org/10.1029/2022PA004470 2024-01-15T00:26:44Z Limited constraints on the variability of the deep-water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detrital carbonates were repeatedly deposited in the Labrador Sea during the last 32 kyr, potentially affecting radiogenic Nd isotope signatures. To investigate this the Nd isotope compositions of deep and intermediate waters were extracted from the authigenic Fe-Mn oxyhydroxide fraction, foraminiferal coatings, the residual silicates and leachates of dolostone grains. We provide a first order estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. During the Last Glacial Maximum the Nd isotope signatures in the Labrador Sea would allow active water mass mixing with more radiogenic ɛNd values (-12.6 and -14) prevailing in its eastern part whereas less radiogenic values (ɛNd ∼ -18.4) were found on the western Labrador slope. The deposition of detrital carbonates during Heinrich stadials (2,1) was accompanied by negative detrital and authigenic Nd isotope excursions (ɛNd ∼ -31) that were likely controlled by dissolution of dolostone or dolostone associated mineral inclusions. This highly unradiogenic signal dominated the authigenic phases and individual water masses in the Labrador Sea, serving as potential source of highly unradiogenic Nd to the North Atlantic region, while exported southward. The Holocene authigenic ɛNd signatures of the coatings and leachates significantly differed from those of the detrital silicates, approaching modern bottom water mass signatures during the Late Holocene. Key Points - Estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea - Dissolution of detrital dolostones in the water column during Heinrich stadials at least partially controlled ɛNd signatures - During the LGM generally more ... Article in Journal/Newspaper Labrador Sea North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Paleoceanography and Paleoclimatology 38 2 |