Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record
Contourites encompass a wide variety of sedimentary facies. Some of them show common facies with others deep-water deposits, such as turbidites and hemipelagites. Sedimentological characterization at macro- and microscales is valuable to discriminate those close facies but the distinction is not alw...
Published in: | Marine Geology |
---|---|
Main Authors: | , , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
|
Subjects: | |
Online Access: | https://hal.science/hal-04204027 https://hal.science/hal-04204027/document https://hal.science/hal-04204027/file/Revised%20paper%20without%20changes-HAL.pdf https://doi.org/10.1016/j.margeo.2023.107031 |
id |
ftccsdartic:oai:HAL:hal-04204027v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-04204027v1 2023-12-31T10:01:16+01:00 Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record Lopes, U. Babonneau, Nathalie Fierens, R. Revillon, Sidonie Raisson, F. Miramontes, E. Rabineau, Marina Aslanian, Daniel Moulin, Maryline Geo-Ocean (GEO-OCEAN) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2023-05 https://hal.science/hal-04204027 https://hal.science/hal-04204027/document https://hal.science/hal-04204027/file/Revised%20paper%20without%20changes-HAL.pdf https://doi.org/10.1016/j.margeo.2023.107031 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2023.107031 hal-04204027 https://hal.science/hal-04204027 https://hal.science/hal-04204027/document https://hal.science/hal-04204027/file/Revised%20paper%20without%20changes-HAL.pdf doi:10.1016/j.margeo.2023.107031 info:eu-repo/semantics/OpenAccess ISSN: 0025-3227 Marine Geology https://hal.science/hal-04204027 Marine Geology, 2023, 459, 107031 (21p.). ⟨10.1016/j.margeo.2023.107031⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.1016/j.margeo.2023.107031 2023-12-02T23:35:26Z Contourites encompass a wide variety of sedimentary facies. Some of them show common facies with others deep-water deposits, such as turbidites and hemipelagites. Sedimentological characterization at macro- and microscales is valuable to discriminate those close facies but the distinction is not always clear. Contourites are increasingly used in paleoceanographic and paleoclimatic reconstructions. Improving their characterization is therefore essential to their interpretations.This study aims at characterizing a foraminiferal sandy contourite facies from a sediment core collected on top of a contourite drift under the influence of the Antarctic Intermediate Water/North Atlantic Deep-Water interface located in the Limpopo Corridor (Mozambique margin, Indian Ocean) at 2000 m depth. This work is based on a detailed analysis of the sedimentary record using physical properties (gamma density and magnetic susceptibility) as well as laser grain size and X-Ray Fluorescence core scanning data.Our results show that: (1) the foraminiferal sand is vertically continuous and homogenous over 633 kyr with an average sedimentation rate of 0.26 cm.kyr−1; (2) this contourite facies results from sedimentation with low terrigenous inputs under stable hydrodynamic conditions over time, with relatively strong bottom currents for this water depth (∼16 cm.s−1); (3) during glacial stages, sedimentation rates are lower and bottom current speed is higher than during interglacial stages. We also propose the concept of “Contourite Graphical Chart” which summaries the theoretical distribution of contourite endmembers from cross-plot of “sorting versus grain-size median D50” and their related sedimentary processes.This study highlights the relevance of condensed foraminiferal sandy contourites as long time-scale paleoceanographic archives and provides new insights for studies related to paleoclimatology and paleoecology. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Marine Geology 459 107031 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Lopes, U. Babonneau, Nathalie Fierens, R. Revillon, Sidonie Raisson, F. Miramontes, E. Rabineau, Marina Aslanian, Daniel Moulin, Maryline Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
Contourites encompass a wide variety of sedimentary facies. Some of them show common facies with others deep-water deposits, such as turbidites and hemipelagites. Sedimentological characterization at macro- and microscales is valuable to discriminate those close facies but the distinction is not always clear. Contourites are increasingly used in paleoceanographic and paleoclimatic reconstructions. Improving their characterization is therefore essential to their interpretations.This study aims at characterizing a foraminiferal sandy contourite facies from a sediment core collected on top of a contourite drift under the influence of the Antarctic Intermediate Water/North Atlantic Deep-Water interface located in the Limpopo Corridor (Mozambique margin, Indian Ocean) at 2000 m depth. This work is based on a detailed analysis of the sedimentary record using physical properties (gamma density and magnetic susceptibility) as well as laser grain size and X-Ray Fluorescence core scanning data.Our results show that: (1) the foraminiferal sand is vertically continuous and homogenous over 633 kyr with an average sedimentation rate of 0.26 cm.kyr−1; (2) this contourite facies results from sedimentation with low terrigenous inputs under stable hydrodynamic conditions over time, with relatively strong bottom currents for this water depth (∼16 cm.s−1); (3) during glacial stages, sedimentation rates are lower and bottom current speed is higher than during interglacial stages. We also propose the concept of “Contourite Graphical Chart” which summaries the theoretical distribution of contourite endmembers from cross-plot of “sorting versus grain-size median D50” and their related sedimentary processes.This study highlights the relevance of condensed foraminiferal sandy contourites as long time-scale paleoceanographic archives and provides new insights for studies related to paleoclimatology and paleoecology. |
author2 |
Geo-Ocean (GEO-OCEAN) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lopes, U. Babonneau, Nathalie Fierens, R. Revillon, Sidonie Raisson, F. Miramontes, E. Rabineau, Marina Aslanian, Daniel Moulin, Maryline |
author_facet |
Lopes, U. Babonneau, Nathalie Fierens, R. Revillon, Sidonie Raisson, F. Miramontes, E. Rabineau, Marina Aslanian, Daniel Moulin, Maryline |
author_sort |
Lopes, U. |
title |
Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
title_short |
Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
title_full |
Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
title_fullStr |
Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
title_full_unstemmed |
Foraminiferal sandy contourite of the Limpopo Corridor (Mozambique margin): Facies characterization and paleoceanographic record |
title_sort |
foraminiferal sandy contourite of the limpopo corridor (mozambique margin): facies characterization and paleoceanographic record |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04204027 https://hal.science/hal-04204027/document https://hal.science/hal-04204027/file/Revised%20paper%20without%20changes-HAL.pdf https://doi.org/10.1016/j.margeo.2023.107031 |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0025-3227 Marine Geology https://hal.science/hal-04204027 Marine Geology, 2023, 459, 107031 (21p.). ⟨10.1016/j.margeo.2023.107031⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2023.107031 hal-04204027 https://hal.science/hal-04204027 https://hal.science/hal-04204027/document https://hal.science/hal-04204027/file/Revised%20paper%20without%20changes-HAL.pdf doi:10.1016/j.margeo.2023.107031 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2023.107031 |
container_title |
Marine Geology |
container_volume |
459 |
container_start_page |
107031 |
_version_ |
1786797927771930624 |