The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene
Abstract 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...
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crwiley:10.1111/bre.12413 2024-06-09T07:46:48+00:00 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 Fondo Nacional de Desarrollo Científico y Tecnológico 2019 http://dx.doi.org/10.1111/bre.12413 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12413 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12413 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12413 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Basin Research volume 32, issue 5, page 1035-1053 ISSN 0950-091X 1365-2117 journal-article 2019 crwiley https://doi.org/10.1111/bre.12413 2024-05-16T14:25:59Z Abstract 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 (46°S), 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 87 Sr/ 86 Sr 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 ... Article in Journal/Newspaper Ice Sheet Wiley Online Library Chonos ENVELOPE(-60.783,-60.783,-62.467,-62.467) Patagonia Basin Research 32 5 1035 1053 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 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 (46°S), 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 87 Sr/ 86 Sr 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 ... |
author2 |
Fondo Nacional de Desarrollo Científico y Tecnológico |
format |
Article in Journal/Newspaper |
author |
Villaseñor, Tania Tentori, Daniel Marsaglia, Kathleen M. Pinto, Luisa |
spellingShingle |
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 |
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 |
2019 |
url |
http://dx.doi.org/10.1111/bre.12413 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12413 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12413 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12413 |
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 volume 32, issue 5, page 1035-1053 ISSN 0950-091X 1365-2117 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bre.12413 |
container_title |
Basin Research |
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32 |
container_issue |
5 |
container_start_page |
1035 |
op_container_end_page |
1053 |
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1801376796121235456 |