Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2
International audience The evolution of Antarctic Circumpolar Current (ACC) and Antarctic Bottom Water (AABW) remains controversial. In this study, we aim to quantify this evolution by studying the trace and rare earth elements, and Sr-Nd isotopes of clay mineralogy during the last deglaciation on f...
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ftunivnantes:oai:HAL:hal-02348813v1 2023-05-15T13:31:46+02:00 Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 Francois, Beny Bout‑roumazeilles, Viviane Davies, Gareth Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Faculty of Earth and Life Sciences Amsterdam (FALW) Vrije Universiteit Amsterdam Amsterdam (VU) Washington, D.C., United States 2018-12-10 https://hal.archives-ouvertes.fr/hal-02348813 en eng HAL CCSD hal-02348813 https://hal.archives-ouvertes.fr/hal-02348813 AGU Fall Meeting https://hal.archives-ouvertes.fr/hal-02348813 AGU Fall Meeting, Dec 2018, Washington, D.C., United States [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] info:eu-repo/semantics/conferenceObject Conference poster 2018 ftunivnantes 2022-12-07T01:44:47Z International audience The evolution of Antarctic Circumpolar Current (ACC) and Antarctic Bottom Water (AABW) remains controversial. In this study, we aim to quantify this evolution by studying the trace and rare earth elements, and Sr-Nd isotopes of clay mineralogy during the last deglaciation on fine grain detrital sediments (<2µm) from the sediment core MD12-3396Cq recovered East of the Kerguelen Plateau. Sediment composition represent a mix between sediments from the Kerguelen Plateau and from Antarctica. Overall, the Kerguelen Plateau is the dominant source of sediment, supporting the idea that the ACC is the most important current bringing sediment to the site. Provenance proxies also show that the contribution of Antarctica was higher than previously thought, reaching 30% during Heinrich Stadial (HS) 1 and 2. We propose that the delivery of sediment from Antarctica is made by the AABW via the Deep Western Boundary Current (DWBC) flowing northward along the Kerguelen Plateau. The higher contribution of AABW during HS 1 and 2 suggests that the DWBC was stronger than during modern interglacial period, and generated enhanced export of the AABW to the Global Ocean via the Deep Western Boundary Current. Conference Object Antarc* Antarctic Antarctica Université de Nantes: HAL-UNIV-NANTES Antarctic Indian Kerguelen |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] |
spellingShingle |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] Francois, Beny Bout‑roumazeilles, Viviane Davies, Gareth Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] |
description |
International audience The evolution of Antarctic Circumpolar Current (ACC) and Antarctic Bottom Water (AABW) remains controversial. In this study, we aim to quantify this evolution by studying the trace and rare earth elements, and Sr-Nd isotopes of clay mineralogy during the last deglaciation on fine grain detrital sediments (<2µm) from the sediment core MD12-3396Cq recovered East of the Kerguelen Plateau. Sediment composition represent a mix between sediments from the Kerguelen Plateau and from Antarctica. Overall, the Kerguelen Plateau is the dominant source of sediment, supporting the idea that the ACC is the most important current bringing sediment to the site. Provenance proxies also show that the contribution of Antarctica was higher than previously thought, reaching 30% during Heinrich Stadial (HS) 1 and 2. We propose that the delivery of sediment from Antarctica is made by the AABW via the Deep Western Boundary Current (DWBC) flowing northward along the Kerguelen Plateau. The higher contribution of AABW during HS 1 and 2 suggests that the DWBC was stronger than during modern interglacial period, and generated enhanced export of the AABW to the Global Ocean via the Deep Western Boundary Current. |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Faculty of Earth and Life Sciences Amsterdam (FALW) Vrije Universiteit Amsterdam Amsterdam (VU) |
format |
Conference Object |
author |
Francois, Beny Bout‑roumazeilles, Viviane Davies, Gareth |
author_facet |
Francois, Beny Bout‑roumazeilles, Viviane Davies, Gareth |
author_sort |
Francois, Beny |
title |
Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
title_short |
Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
title_full |
Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
title_fullStr |
Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
title_full_unstemmed |
Sr-Nd isotopes and clay mineralogy on the South Indian Ridge: evidence of stronger equatorward export of AABW during Heinrich Stadial 1 and 2 |
title_sort |
sr-nd isotopes and clay mineralogy on the south indian ridge: evidence of stronger equatorward export of aabw during heinrich stadial 1 and 2 |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-02348813 |
op_coverage |
Washington, D.C., United States |
geographic |
Antarctic Indian Kerguelen |
geographic_facet |
Antarctic Indian Kerguelen |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
AGU Fall Meeting https://hal.archives-ouvertes.fr/hal-02348813 AGU Fall Meeting, Dec 2018, Washington, D.C., United States |
op_relation |
hal-02348813 https://hal.archives-ouvertes.fr/hal-02348813 |
_version_ |
1766020835591585792 |