Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay).
The Southwestern Atlantic margin is characterized by several canyon systems incised on a huge contourite depositional system associated with the interaction of strong Antarctic water masses with the seafloor. So far, however, only one mega slide canyon (Cabo Polonio) has been described in the Urugua...
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Asociación Argentina de Sedimentología
2021
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ftdoajarticles:oai:doaj.org/article:a29768ef00e1460396d8f9151b6077a1 2024-01-21T10:01:43+01:00 Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). Paula Franco-Fraguas Leticia Burone Cesar Goso Fabricio Scarabino Rossana Muzio Alvar Carranza Leonardo Ortega Araceli Muñoz Michel Mahiques 2021-03-01T00:00:00Z https://doaj.org/article/a29768ef00e1460396d8f9151b6077a1 EN ES PT eng spa por Asociación Argentina de Sedimentología https://www.lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/120 https://doaj.org/toc/1669-7316 https://doaj.org/toc/1851-4979 1669-7316 1851-4979 https://doaj.org/article/a29768ef00e1460396d8f9151b6077a1 Latin American Journal of Sedimentology and Basin Analysis, Vol 24, Iss 1 (2021) Mega Slide Canyon head Retrogressive processes Contouritic deposits Gravel Southwestern Atlantic Margin Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2021 ftdoajarticles 2023-12-24T01:42:39Z The Southwestern Atlantic margin is characterized by several canyon systems incised on a huge contourite depositional system associated with the interaction of strong Antarctic water masses with the seafloor. So far, however, only one mega slide canyon (Cabo Polonio) has been described in the Uruguayan continental slope. In this work, sedimentary processes dominating the head of this mega slide canyon are described and interpreted based on the analysis of the composition (texture and fossils) and distribution of widespread gravel along its head and thalweg. This information is integrated with acoustic (multibeam and seismic) and hydrological data. Results suggest that the evolution of the head of the canyon presents retrogressive erosion related to debris and turbidity flows. This erosion is ongoing and/or has been active during the recent past and contourite deposits are involved in headwall erosion. The pathway of gravel along the canyon and the thalweg was reconstructed. The strong flow of the South Atlantic Central Water, and its interaction with the Antarctic Intermediate Water, dominates the modern hydrology, promoting highly energetic conditions enhancing headwall erosion. This work contributes to a better understanding of the sedimentary processes connected to an mega slide canyon in the upper slope off Uruguay and located in the northernmost distribution of the South Atlantic Contourite Depositional System. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Uruguay |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish Portuguese |
topic |
Mega Slide Canyon head Retrogressive processes Contouritic deposits Gravel Southwestern Atlantic Margin Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Mega Slide Canyon head Retrogressive processes Contouritic deposits Gravel Southwestern Atlantic Margin Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Paula Franco-Fraguas Leticia Burone Cesar Goso Fabricio Scarabino Rossana Muzio Alvar Carranza Leonardo Ortega Araceli Muñoz Michel Mahiques Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
topic_facet |
Mega Slide Canyon head Retrogressive processes Contouritic deposits Gravel Southwestern Atlantic Margin Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
The Southwestern Atlantic margin is characterized by several canyon systems incised on a huge contourite depositional system associated with the interaction of strong Antarctic water masses with the seafloor. So far, however, only one mega slide canyon (Cabo Polonio) has been described in the Uruguayan continental slope. In this work, sedimentary processes dominating the head of this mega slide canyon are described and interpreted based on the analysis of the composition (texture and fossils) and distribution of widespread gravel along its head and thalweg. This information is integrated with acoustic (multibeam and seismic) and hydrological data. Results suggest that the evolution of the head of the canyon presents retrogressive erosion related to debris and turbidity flows. This erosion is ongoing and/or has been active during the recent past and contourite deposits are involved in headwall erosion. The pathway of gravel along the canyon and the thalweg was reconstructed. The strong flow of the South Atlantic Central Water, and its interaction with the Antarctic Intermediate Water, dominates the modern hydrology, promoting highly energetic conditions enhancing headwall erosion. This work contributes to a better understanding of the sedimentary processes connected to an mega slide canyon in the upper slope off Uruguay and located in the northernmost distribution of the South Atlantic Contourite Depositional System. |
format |
Article in Journal/Newspaper |
author |
Paula Franco-Fraguas Leticia Burone Cesar Goso Fabricio Scarabino Rossana Muzio Alvar Carranza Leonardo Ortega Araceli Muñoz Michel Mahiques |
author_facet |
Paula Franco-Fraguas Leticia Burone Cesar Goso Fabricio Scarabino Rossana Muzio Alvar Carranza Leonardo Ortega Araceli Muñoz Michel Mahiques |
author_sort |
Paula Franco-Fraguas |
title |
Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
title_short |
Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
title_full |
Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
title_fullStr |
Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
title_full_unstemmed |
Sedimentary processes in the head of the Cabo Polonio mega slide canyon (Southwestern Atlantic Margin off Uruguay). |
title_sort |
sedimentary processes in the head of the cabo polonio mega slide canyon (southwestern atlantic margin off uruguay). |
publisher |
Asociación Argentina de Sedimentología |
publishDate |
2021 |
url |
https://doaj.org/article/a29768ef00e1460396d8f9151b6077a1 |
geographic |
Antarctic The Antarctic Uruguay |
geographic_facet |
Antarctic The Antarctic Uruguay |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Latin American Journal of Sedimentology and Basin Analysis, Vol 24, Iss 1 (2021) |
op_relation |
https://www.lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/120 https://doaj.org/toc/1669-7316 https://doaj.org/toc/1851-4979 1669-7316 1851-4979 https://doaj.org/article/a29768ef00e1460396d8f9151b6077a1 |
_version_ |
1788691777110147072 |