Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation
This thesis documents the physical processes involved in the opening and subsequent filling of the Cerro Benítez cavities (Chilean Patagonia), which led to the trapping of sediments rich in extinct megafaunal remains and archaeological material of Pleistocene age in the vicinity of the Patagonian ic...
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Other Authors: | , , , , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
Published: |
HAL CCSD
2023
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Subjects: | |
Online Access: | https://hal.science/tel-04469768 https://hal.science/tel-04469768v2/document https://hal.science/tel-04469768v2/file/Manuscrit%20HAL.pdf |
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ftnormandieuniv:oai:HAL:tel-04469768v2 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Normandie Université: HAL |
op_collection_id |
ftnormandieuniv |
language |
French |
topic |
geomorphology geoarchaeology geochronology sediments cave glaciation Patagonia megafauna tephra coprolites géomorphologie géoarchéologie géochronologie sédiments grotte Patagonie mégafaune coprolithes [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
geomorphology geoarchaeology geochronology sediments cave glaciation Patagonia megafauna tephra coprolites géomorphologie géoarchéologie géochronologie sédiments grotte Patagonie mégafaune coprolithes [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography Girault, Igor Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
topic_facet |
geomorphology geoarchaeology geochronology sediments cave glaciation Patagonia megafauna tephra coprolites géomorphologie géoarchéologie géochronologie sédiments grotte Patagonie mégafaune coprolithes [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
description |
This thesis documents the physical processes involved in the opening and subsequent filling of the Cerro Benítez cavities (Chilean Patagonia), which led to the trapping of sediments rich in extinct megafaunal remains and archaeological material of Pleistocene age in the vicinity of the Patagonian ice cap during the last glacial termination. The mapping of glacial landforms and the dating of erratic boulder exposure surfaces by in situ cosmogenic 10Be, combined with chronological modelling using Bayesian statistics, lead us first to propose an absolute chronology of deglaciation and proglacial lacustrine regression. Electrical resistivity tomography, combined with 3D cave modelling, reveals the existence of stepped planation surfaces buried in the caves, leading us to formulate a model of glaciolacustrine speleogenesis. Finally, comparative stratigraphy combined with grain-size, crystallographic, geochemical and micromorphological analysis of the sedimentary fillings of nine cavities, including the famous Cueva del Milodón, reveals the influence of bedrock and climatic fluctuations during the last glacial termination on the genesis of megafauna-bearing sediments. Cette thèse documente les processus physiques impliqués dans l’ouverture puis le remplissage des cavités du Cerro Benítez (Patagonie chilienne) ayant abouti au piégeage de sédiments riches en restes de mégafaune éteinte et en matériel archéologique d’âge pléistocène, au voisinage de la calotte de glace patagonne, lors de la dernière terminaison glaciaire. La cartographie des modelés glaciaires ainsi que la datation des surfaces d’exposition des blocs erratiques par 10Be cosmogénique produit in situ, associée à la modélisation chronologique par les statistiques bayésiennes, nous conduisent d’abord à proposer une chronologie absolue de la déglaciation et de la régression lacustre proglaciaire. La mise en évidence de surfaces d’aplanissement étagées enfouies dans les grottes, par la tomographie de résistivité électrique associée à la modélisation 3D des ... |
author2 |
Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés (IDEES) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université Le Havre Normandie (ULH) Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire Homme et Société (IRIHS) Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU) Université de Rouen Damase Mouralis Fabiana María Martín Dominique Todisco (co-encadrant) |
format |
Doctoral or Postdoctoral Thesis |
author |
Girault, Igor |
author_facet |
Girault, Igor |
author_sort |
Girault, Igor |
title |
Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
title_short |
Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
title_full |
Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
title_fullStr |
Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
title_full_unstemmed |
Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
title_sort |
geomorphology and sedimentology of the cerro benítez cavities (patagonia, chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/tel-04469768 https://hal.science/tel-04469768v2/document https://hal.science/tel-04469768v2/file/Manuscrit%20HAL.pdf |
long_lat |
ENVELOPE(-62.600,-62.600,-64.150,-64.150) ENVELOPE(-61.567,-61.567,-64.383,-64.383) |
geographic |
Patagonia Cueva Benítez |
geographic_facet |
Patagonia Cueva Benítez |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
https://hal.science/tel-04469768 Géomorphologie. Université de Rouen, 2023. Français. ⟨NNT : 2023NORMR085⟩ |
op_relation |
NNT: 2023NORMR085 tel-04469768 https://hal.science/tel-04469768 https://hal.science/tel-04469768v2/document https://hal.science/tel-04469768v2/file/Manuscrit%20HAL.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
_version_ |
1796310888896004096 |
spelling |
ftnormandieuniv:oai:HAL:tel-04469768v2 2024-04-14T08:13:01+00:00 Geomorphology and sedimentology of the Cerro Benítez cavities (Patagonia, Chile): genesis and evolution of a megafauna sedimentary trap during the last glaciation Géomorphologie et sédimentologie des cavités du Cerro Benítez (Patagonie, Chili) : genèse et évolution d’un piège sédimentaire à mégafaune lors de la dernière glaciation Girault, Igor Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés (IDEES) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université Le Havre Normandie (ULH) Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire Homme et Société (IRIHS) Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU) Université de Rouen Damase Mouralis Fabiana María Martín Dominique Todisco (co-encadrant) 2023-12-21 https://hal.science/tel-04469768 https://hal.science/tel-04469768v2/document https://hal.science/tel-04469768v2/file/Manuscrit%20HAL.pdf fr fre HAL CCSD NNT: 2023NORMR085 tel-04469768 https://hal.science/tel-04469768 https://hal.science/tel-04469768v2/document https://hal.science/tel-04469768v2/file/Manuscrit%20HAL.pdf http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess https://hal.science/tel-04469768 Géomorphologie. Université de Rouen, 2023. Français. ⟨NNT : 2023NORMR085⟩ geomorphology geoarchaeology geochronology sediments cave glaciation Patagonia megafauna tephra coprolites géomorphologie géoarchéologie géochronologie sédiments grotte Patagonie mégafaune coprolithes [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/doctoralThesis Theses 2023 ftnormandieuniv 2024-03-21T16:24:25Z This thesis documents the physical processes involved in the opening and subsequent filling of the Cerro Benítez cavities (Chilean Patagonia), which led to the trapping of sediments rich in extinct megafaunal remains and archaeological material of Pleistocene age in the vicinity of the Patagonian ice cap during the last glacial termination. The mapping of glacial landforms and the dating of erratic boulder exposure surfaces by in situ cosmogenic 10Be, combined with chronological modelling using Bayesian statistics, lead us first to propose an absolute chronology of deglaciation and proglacial lacustrine regression. Electrical resistivity tomography, combined with 3D cave modelling, reveals the existence of stepped planation surfaces buried in the caves, leading us to formulate a model of glaciolacustrine speleogenesis. Finally, comparative stratigraphy combined with grain-size, crystallographic, geochemical and micromorphological analysis of the sedimentary fillings of nine cavities, including the famous Cueva del Milodón, reveals the influence of bedrock and climatic fluctuations during the last glacial termination on the genesis of megafauna-bearing sediments. Cette thèse documente les processus physiques impliqués dans l’ouverture puis le remplissage des cavités du Cerro Benítez (Patagonie chilienne) ayant abouti au piégeage de sédiments riches en restes de mégafaune éteinte et en matériel archéologique d’âge pléistocène, au voisinage de la calotte de glace patagonne, lors de la dernière terminaison glaciaire. La cartographie des modelés glaciaires ainsi que la datation des surfaces d’exposition des blocs erratiques par 10Be cosmogénique produit in situ, associée à la modélisation chronologique par les statistiques bayésiennes, nous conduisent d’abord à proposer une chronologie absolue de la déglaciation et de la régression lacustre proglaciaire. La mise en évidence de surfaces d’aplanissement étagées enfouies dans les grottes, par la tomographie de résistivité électrique associée à la modélisation 3D des ... Doctoral or Postdoctoral Thesis Ice cap Normandie Université: HAL Patagonia Cueva ENVELOPE(-62.600,-62.600,-64.150,-64.150) Benítez ENVELOPE(-61.567,-61.567,-64.383,-64.383) |