Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core
International audience Reactive phosphorus undergoes diagenetic transformation once transferred into marine sediments. The degree of regeneration and redistribution of phosphorus depends on early diagenetic and environmental conditions, which may be linked to larger scale phenomena, such as bottom w...
Published in: | Geochimica et Cosmochimica Acta |
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ftunivnantes:oai:HAL:insu-03618997v1 2023-05-15T17:30:10+02:00 Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core Tamburini, Federica Huon, Sylvain Steinmann, Philipp Grousset, Francis E. Adatte, Thierry Fllmi, Karl B. Institut d'écologie et des sciences de l'environnement de Paris (iEES) Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2002 https://hal-insu.archives-ouvertes.fr/insu-03618997 https://doi.org/10.1016/S0016-7037(02)00986-9 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0016-7037(02)00986-9 insu-03618997 https://hal-insu.archives-ouvertes.fr/insu-03618997 BIBCODE: 2002GeCoA.66.4069T doi:10.1016/S0016-7037(02)00986-9 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal-insu.archives-ouvertes.fr/insu-03618997 Geochimica et Cosmochimica Acta, 2002, 66, pp.4069-4083. ⟨10.1016/S0016-7037(02)00986-9⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2002 ftunivnantes https://doi.org/10.1016/S0016-7037(02)00986-9 2023-02-08T03:02:13Z International audience Reactive phosphorus undergoes diagenetic transformation once transferred into marine sediments. The degree of regeneration and redistribution of phosphorus depends on early diagenetic and environmental conditions, which may be linked to larger scale phenomena, such as bottom water circulation, water column ventilation, and organic carbon flux. Phosphorus phases of the <50-μm-sized fraction of deep-sea sediments from core SU 90-09 (North Atlantic, 43°31'N, 30°24'W, 3375 m below sea level) have been analyzed using a sequential extraction technique (SEDEX method) to reconstruct phosphorus geochemistry during Heinrich events 4 and 5. Comparison with Holocene samples from the same site indicates that postdeposition diagenetic transformation has not affected phosphorus distribution in the deep part of the sediments. Total and reactive phosphorus average 0.40 ± 0.04 mg/g and 0.30 ± 0.05 mg/g, respectively, and are comparable to values found in analog deep-sea environments in the North Atlantic. Detrital phosphorus, the phase linked to igneous- and metamorphic-derived material, sharply increases during Heinrich events and covaries with the ice-rafted debris record, whereas authigenic and Fe-bound phosphorus phases, both influenced by redox conditions, decrease or even disappear. These findings suggest that during the deposition of Heinrich layers (HLs), environmental parameters hampered the precipitation of these phases. Large freshwater discharges in relation to iceberg surges may have provoked a temporary stratification of the water column. Accordingly, dysaerobic conditions in the sediments may have fostered the loss of dissolved phosphorus from the sediments to the water column, in a direct and rapid response to the changed conditions. Decreasing trends in organic matter elemental ratios (total organic carbon/organic phosphorus) and Rock-Eval oxygen index values, along with the presence of partly authigenic dolomite and ankerite within HLs, also support this assumption. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Geochimica et Cosmochimica Acta 66 23 4069 4083 |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Tamburini, Federica Huon, Sylvain Steinmann, Philipp Grousset, Francis E. Adatte, Thierry Fllmi, Karl B. Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Reactive phosphorus undergoes diagenetic transformation once transferred into marine sediments. The degree of regeneration and redistribution of phosphorus depends on early diagenetic and environmental conditions, which may be linked to larger scale phenomena, such as bottom water circulation, water column ventilation, and organic carbon flux. Phosphorus phases of the <50-μm-sized fraction of deep-sea sediments from core SU 90-09 (North Atlantic, 43°31'N, 30°24'W, 3375 m below sea level) have been analyzed using a sequential extraction technique (SEDEX method) to reconstruct phosphorus geochemistry during Heinrich events 4 and 5. Comparison with Holocene samples from the same site indicates that postdeposition diagenetic transformation has not affected phosphorus distribution in the deep part of the sediments. Total and reactive phosphorus average 0.40 ± 0.04 mg/g and 0.30 ± 0.05 mg/g, respectively, and are comparable to values found in analog deep-sea environments in the North Atlantic. Detrital phosphorus, the phase linked to igneous- and metamorphic-derived material, sharply increases during Heinrich events and covaries with the ice-rafted debris record, whereas authigenic and Fe-bound phosphorus phases, both influenced by redox conditions, decrease or even disappear. These findings suggest that during the deposition of Heinrich layers (HLs), environmental parameters hampered the precipitation of these phases. Large freshwater discharges in relation to iceberg surges may have provoked a temporary stratification of the water column. Accordingly, dysaerobic conditions in the sediments may have fostered the loss of dissolved phosphorus from the sediments to the water column, in a direct and rapid response to the changed conditions. Decreasing trends in organic matter elemental ratios (total organic carbon/organic phosphorus) and Rock-Eval oxygen index values, along with the presence of partly authigenic dolomite and ankerite within HLs, also support this assumption. |
author2 |
Institut d'écologie et des sciences de l'environnement de Paris (iEES) Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tamburini, Federica Huon, Sylvain Steinmann, Philipp Grousset, Francis E. Adatte, Thierry Fllmi, Karl B. |
author_facet |
Tamburini, Federica Huon, Sylvain Steinmann, Philipp Grousset, Francis E. Adatte, Thierry Fllmi, Karl B. |
author_sort |
Tamburini, Federica |
title |
Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
title_short |
Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
title_full |
Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
title_fullStr |
Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
title_full_unstemmed |
Dysaerobic conditions during Heinrich events 4 and 5: Evidence from phosphorus distribution in a North Atlantic deep-sea core |
title_sort |
dysaerobic conditions during heinrich events 4 and 5: evidence from phosphorus distribution in a north atlantic deep-sea core |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03618997 https://doi.org/10.1016/S0016-7037(02)00986-9 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal-insu.archives-ouvertes.fr/insu-03618997 Geochimica et Cosmochimica Acta, 2002, 66, pp.4069-4083. ⟨10.1016/S0016-7037(02)00986-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0016-7037(02)00986-9 insu-03618997 https://hal-insu.archives-ouvertes.fr/insu-03618997 BIBCODE: 2002GeCoA.66.4069T doi:10.1016/S0016-7037(02)00986-9 |
op_doi |
https://doi.org/10.1016/S0016-7037(02)00986-9 |
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66 |
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4083 |
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