The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene
Pleistocene glaciations have promoted important landscape transformations as a result of high rates of erosion and rapid sediment evacuation to adjacent marine basins. In the Patagonian Andes the role of the Patagonian Ice Sheet on landscape evolution, in particular the spatial patterns of glacial e...
Published in: | Basin Research |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
2020
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Online Access: | https://archimer.ifremer.fr/doc/00565/67730/67219.pdf https://archimer.ifremer.fr/doc/00565/67730/67220.xlsx https://archimer.ifremer.fr/doc/00565/67730/67221.xlsx https://archimer.ifremer.fr/doc/00565/67730/67222.xlsx https://archimer.ifremer.fr/doc/00565/67730/77807.pdf https://doi.org/10.1111/bre.12413 https://archimer.ifremer.fr/doc/00565/67730/ |
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ftarchimer:oai:archimer.ifremer.fr:67730 2023-05-15T16:40:34+02:00 The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene Villaseñor, Tania Tentori, Daniel Marsaglia, Kathleen M. Pinto, Luisa 2020-10 application/pdf https://archimer.ifremer.fr/doc/00565/67730/67219.pdf https://archimer.ifremer.fr/doc/00565/67730/67220.xlsx https://archimer.ifremer.fr/doc/00565/67730/67221.xlsx https://archimer.ifremer.fr/doc/00565/67730/67222.xlsx https://archimer.ifremer.fr/doc/00565/67730/77807.pdf https://doi.org/10.1111/bre.12413 https://archimer.ifremer.fr/doc/00565/67730/ eng eng Wiley https://archimer.ifremer.fr/doc/00565/67730/67219.pdf https://archimer.ifremer.fr/doc/00565/67730/67220.xlsx https://archimer.ifremer.fr/doc/00565/67730/67221.xlsx https://archimer.ifremer.fr/doc/00565/67730/67222.xlsx https://archimer.ifremer.fr/doc/00565/67730/77807.pdf doi:10.1111/bre.12413 https://archimer.ifremer.fr/doc/00565/67730/ info:eu-repo/semantics/openAccess restricted use Basin Research (0950-091X) (Wiley), 2020-10 , Vol. 32 , N. 5 , P. 1045-1063 glacial erosion Ocean Drilling Program Patagonia Patagonian Ice Sheet sediment provenance source to sink text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1111/bre.12413 2021-09-23T20:33:33Z Pleistocene glaciations have promoted important landscape transformations as a result of high rates of erosion and rapid sediment evacuation to adjacent marine basins. In the Patagonian Andes the role of the Patagonian Ice Sheet on landscape evolution, in particular the spatial patterns of glacial erosion and its influence on sediment fluxes, is poorly documented. Here, we investigate the Middle and Late Pleistocene sedimentary record of the continental slope from Ocean Drilling Program (ODP) Site 861, offshore Patagonia (46ºS), to evaluate the link between glaciations, mountain range erosion and continental margin strata formation. Petrographic analysis of the sand‐size fraction (0.063‐2 mm) and ƐNd and 87Sr/86Sr measurements in the silt‐size fraction (10‐63 µm) indicate that glacial erosion over the last 350,000 years has focused within the Patagonian Batholith, with a minor influence of a proximal source to the drilling site, the Chonos Metamorphic Complex. This shows that erosion has focused in the core of the northern Patagonian Andes, coinciding roughly with the location of the Liquiñe‐Ofqui Fault Zone and the zone of concentrated precipitation during glaciations, suggesting a combined climatic and structural control on glacial erosion. Temporal variation in the provenance signal is contemporaneous with a marked change in the stratigraphy of ODP Site 861 that occurred after the glaciation of MIS 8 (~240 kyr ago). Before MIS 8, a restricted provenance signal and coarse lithofacies accumulated on the continental slope indicates spatially restricted erosion and efficient transfer of sediment towards the ocean. In contrast, very high provenance variability and finer continental slope lithofacies accumulation after MIS 8 suggest a disorganized expansion of the areas under erosion and a more distal influence of ice sediment discharge to this site. We argue that this change may have been related to a re‐organization of the drainage patterns of the Patagonian Ice Sheet and flow of outlet glaciers to the continental margin during the last two glaciations. Article in Journal/Newspaper Ice Sheet Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Chonos ENVELOPE(-60.783,-60.783,-62.467,-62.467) Patagonia Basin Research 32 5 1035 1053 |
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 |
glacial erosion Ocean Drilling Program Patagonia Patagonian Ice Sheet sediment provenance source to sink |
spellingShingle |
glacial erosion Ocean Drilling Program Patagonia Patagonian Ice Sheet sediment provenance source to sink Villaseñor, Tania Tentori, Daniel Marsaglia, Kathleen M. Pinto, Luisa The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
topic_facet |
glacial erosion Ocean Drilling Program Patagonia Patagonian Ice Sheet sediment provenance source to sink |
description |
Pleistocene glaciations have promoted important landscape transformations as a result of high rates of erosion and rapid sediment evacuation to adjacent marine basins. In the Patagonian Andes the role of the Patagonian Ice Sheet on landscape evolution, in particular the spatial patterns of glacial erosion and its influence on sediment fluxes, is poorly documented. Here, we investigate the Middle and Late Pleistocene sedimentary record of the continental slope from Ocean Drilling Program (ODP) Site 861, offshore Patagonia (46ºS), to evaluate the link between glaciations, mountain range erosion and continental margin strata formation. Petrographic analysis of the sand‐size fraction (0.063‐2 mm) and ƐNd and 87Sr/86Sr measurements in the silt‐size fraction (10‐63 µm) indicate that glacial erosion over the last 350,000 years has focused within the Patagonian Batholith, with a minor influence of a proximal source to the drilling site, the Chonos Metamorphic Complex. This shows that erosion has focused in the core of the northern Patagonian Andes, coinciding roughly with the location of the Liquiñe‐Ofqui Fault Zone and the zone of concentrated precipitation during glaciations, suggesting a combined climatic and structural control on glacial erosion. Temporal variation in the provenance signal is contemporaneous with a marked change in the stratigraphy of ODP Site 861 that occurred after the glaciation of MIS 8 (~240 kyr ago). Before MIS 8, a restricted provenance signal and coarse lithofacies accumulated on the continental slope indicates spatially restricted erosion and efficient transfer of sediment towards the ocean. In contrast, very high provenance variability and finer continental slope lithofacies accumulation after MIS 8 suggest a disorganized expansion of the areas under erosion and a more distal influence of ice sediment discharge to this site. We argue that this change may have been related to a re‐organization of the drainage patterns of the Patagonian Ice Sheet and flow of outlet glaciers to the continental margin during the last two glaciations. |
format |
Article in Journal/Newspaper |
author |
Villaseñor, Tania Tentori, Daniel Marsaglia, Kathleen M. Pinto, Luisa |
author_facet |
Villaseñor, Tania Tentori, Daniel Marsaglia, Kathleen M. Pinto, Luisa |
author_sort |
Villaseñor, Tania |
title |
The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
title_short |
The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
title_full |
The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
title_fullStr |
The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
title_full_unstemmed |
The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene |
title_sort |
changing patagonian landscape: erosion and westward sediment transfer paths in northern patagonia during the middle and late pleistocene |
publisher |
Wiley |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00565/67730/67219.pdf https://archimer.ifremer.fr/doc/00565/67730/67220.xlsx https://archimer.ifremer.fr/doc/00565/67730/67221.xlsx https://archimer.ifremer.fr/doc/00565/67730/67222.xlsx https://archimer.ifremer.fr/doc/00565/67730/77807.pdf https://doi.org/10.1111/bre.12413 https://archimer.ifremer.fr/doc/00565/67730/ |
long_lat |
ENVELOPE(-60.783,-60.783,-62.467,-62.467) |
geographic |
Chonos Patagonia |
geographic_facet |
Chonos Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Basin Research (0950-091X) (Wiley), 2020-10 , Vol. 32 , N. 5 , P. 1045-1063 |
op_relation |
https://archimer.ifremer.fr/doc/00565/67730/67219.pdf https://archimer.ifremer.fr/doc/00565/67730/67220.xlsx https://archimer.ifremer.fr/doc/00565/67730/67221.xlsx https://archimer.ifremer.fr/doc/00565/67730/67222.xlsx https://archimer.ifremer.fr/doc/00565/67730/77807.pdf doi:10.1111/bre.12413 https://archimer.ifremer.fr/doc/00565/67730/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/bre.12413 |
container_title |
Basin Research |
container_volume |
32 |
container_issue |
5 |
container_start_page |
1035 |
op_container_end_page |
1053 |
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1766030973484400640 |