Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes
Bottom currents are key processes that contribute to the shaping of submarine slopes, with the redistribution of sediments in contourite systems. Despite numerous recent studies on contourite systems, the complexity and diversity of these sedimentary systems are still not fully understood and often...
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Online Access: | https://archimer.ifremer.fr/doc/00795/90745/96339.pdf https://doi.org/10.1111/sed.13045 https://archimer.ifremer.fr/doc/00795/90745/ |
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ftarchimer:oai:archimer.ifremer.fr:90745 2023-07-16T03:53:59+02:00 Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes Babonneau, Nathalie Raisson, François Genêt, Adrien Lopes, Ugo Fierens, Ruth Miramontes, Elda Révillon, Sidonie Rabineau, Marina Droz, Laurence Belleney, Deborah Moulin, Maryline Aslanian, Daniel 2023-04 application/pdf https://archimer.ifremer.fr/doc/00795/90745/96339.pdf https://doi.org/10.1111/sed.13045 https://archimer.ifremer.fr/doc/00795/90745/ eng eng Wiley https://archimer.ifremer.fr/doc/00795/90745/96339.pdf doi:10.1111/sed.13045 https://archimer.ifremer.fr/doc/00795/90745/ info:eu-repo/semantics/openAccess restricted use Sedimentology (0037-0746) (Wiley), 2023-04 , Vol. 70 , N. 3 , P. 728-758 Bottom current calcarenite contourite drift moat Mozambique text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1111/sed.13045 2023-06-27T22:51:08Z Bottom currents are key processes that contribute to the shaping of submarine slopes, with the redistribution of sediments in contourite systems. Despite numerous recent studies on contourite systems, the complexity and diversity of these sedimentary systems are still not fully understood and often underestimated. Their understanding requires comprehensive works integrating all scales from seismic architecture to microfacies. This paper focuses on a contouritic ridge located between 2000 m and 2500 m water depth on the Mozambique margin. Bathymetry, seismic data and piston cores collected during the PAMELA-MOZ3 cruise allow a multi-scale study from large depositional geometries to sedimentary facies. At the seismic scale, the contouritic ridge show three stages of evolution with: (i) initiation and development of the drift/moat system; (ii) an intermediate stage with successive incisions and aggradations; and (iii) moat infill and drift erosion during the Plio-Quaternary. Plio-Quaternary deposits are composed of hemipelagic, turbiditic and contouritic facies filling the moat. Coarse-grained contouritic facies, dominated by planktonic foraminifera, are identified on the western flank of the ridge between the moat infill and the erosional area at the top of the ridge. They consist of condensed deposits, with sedimentation rate about 0.3 cm/ka, indicating a strong and stable bottom current that winnows away the fine-grained component. This facies could be present more generally in intermediate position between erosion and depositional areas in contourite systems. At present, the contourite system is located at the transition depth between North Atlantic Deep Water and Antarctic Intermediate Water. Trajectories of bottom currents are complex and interact with sporadic turbidity currents and anti-clockwise eddies that participate in reshaping the sea floor morphology. Although Plio-Quaternary depositional geometries indicate the end of drift/moat development, the moat filling and drift erosion are also related to ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Sedimentology |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Bottom current calcarenite contourite drift moat Mozambique |
spellingShingle |
Bottom current calcarenite contourite drift moat Mozambique Babonneau, Nathalie Raisson, François Genêt, Adrien Lopes, Ugo Fierens, Ruth Miramontes, Elda Révillon, Sidonie Rabineau, Marina Droz, Laurence Belleney, Deborah Moulin, Maryline Aslanian, Daniel Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
topic_facet |
Bottom current calcarenite contourite drift moat Mozambique |
description |
Bottom currents are key processes that contribute to the shaping of submarine slopes, with the redistribution of sediments in contourite systems. Despite numerous recent studies on contourite systems, the complexity and diversity of these sedimentary systems are still not fully understood and often underestimated. Their understanding requires comprehensive works integrating all scales from seismic architecture to microfacies. This paper focuses on a contouritic ridge located between 2000 m and 2500 m water depth on the Mozambique margin. Bathymetry, seismic data and piston cores collected during the PAMELA-MOZ3 cruise allow a multi-scale study from large depositional geometries to sedimentary facies. At the seismic scale, the contouritic ridge show three stages of evolution with: (i) initiation and development of the drift/moat system; (ii) an intermediate stage with successive incisions and aggradations; and (iii) moat infill and drift erosion during the Plio-Quaternary. Plio-Quaternary deposits are composed of hemipelagic, turbiditic and contouritic facies filling the moat. Coarse-grained contouritic facies, dominated by planktonic foraminifera, are identified on the western flank of the ridge between the moat infill and the erosional area at the top of the ridge. They consist of condensed deposits, with sedimentation rate about 0.3 cm/ka, indicating a strong and stable bottom current that winnows away the fine-grained component. This facies could be present more generally in intermediate position between erosion and depositional areas in contourite systems. At present, the contourite system is located at the transition depth between North Atlantic Deep Water and Antarctic Intermediate Water. Trajectories of bottom currents are complex and interact with sporadic turbidity currents and anti-clockwise eddies that participate in reshaping the sea floor morphology. Although Plio-Quaternary depositional geometries indicate the end of drift/moat development, the moat filling and drift erosion are also related to ... |
format |
Article in Journal/Newspaper |
author |
Babonneau, Nathalie Raisson, François Genêt, Adrien Lopes, Ugo Fierens, Ruth Miramontes, Elda Révillon, Sidonie Rabineau, Marina Droz, Laurence Belleney, Deborah Moulin, Maryline Aslanian, Daniel |
author_facet |
Babonneau, Nathalie Raisson, François Genêt, Adrien Lopes, Ugo Fierens, Ruth Miramontes, Elda Révillon, Sidonie Rabineau, Marina Droz, Laurence Belleney, Deborah Moulin, Maryline Aslanian, Daniel |
author_sort |
Babonneau, Nathalie |
title |
Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
title_short |
Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
title_full |
Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
title_fullStr |
Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
title_full_unstemmed |
Contourite on the Limpopo Corridor, Mozambique margin: Long‐term evolution, facies distribution and Plio‐Quaternary processes |
title_sort |
contourite on the limpopo corridor, mozambique margin: long‐term evolution, facies distribution and plio‐quaternary processes |
publisher |
Wiley |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00795/90745/96339.pdf https://doi.org/10.1111/sed.13045 https://archimer.ifremer.fr/doc/00795/90745/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera |
op_source |
Sedimentology (0037-0746) (Wiley), 2023-04 , Vol. 70 , N. 3 , P. 728-758 |
op_relation |
https://archimer.ifremer.fr/doc/00795/90745/96339.pdf doi:10.1111/sed.13045 https://archimer.ifremer.fr/doc/00795/90745/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/sed.13045 |
container_title |
Sedimentology |
_version_ |
1771551230480351232 |