10Be chronology of deglaciation and ice-dammed lake regression in the vicinity of the Mylodon Cave (Cerro Benítez, Patagonia, Chile)
Igor Girault
(1)
,
Dominique Todisco
(1)
,
Attila Çiner
(2)
,
Mehmet Akif Sarıkaya
(2)
,
Cengiz Yıldırım
(2)
,
Amélie Quiquerez
(3)
,
Fabiana Martin
(4)
,
Luis Borrero
(5)
,
Derek Fabel
(6)
,
Philippe Grandjean
(7)
,
Carole Nehme
(1)
,
Damase Mouralis
(1)
1
IDEES -
Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés
2 AYBE - Avrasya Yer Bilimleri Enstitüsü = Eurasia Institute of Earth Sciences [Istanbul]
3 ARTeHiS - Archéologie, Terre, Histoire, Sociétés [Dijon]
4 UMAG - Universidad de Magallanes
5 UBA - Universidad de Buenos Aires [Buenos Aires]
6 SUERC - Scottish Universities Environmental Research Centre
7 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
2 AYBE - Avrasya Yer Bilimleri Enstitüsü = Eurasia Institute of Earth Sciences [Istanbul]
3 ARTeHiS - Archéologie, Terre, Histoire, Sociétés [Dijon]
4 UMAG - Universidad de Magallanes
5 UBA - Universidad de Buenos Aires [Buenos Aires]
6 SUERC - Scottish Universities Environmental Research Centre
7 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
Igor Girault
- Fonction : Auteur
- PersonId : 1266325
- IdHAL : igor-girault
- ORCID : 0000-0002-9893-8843
Dominique Todisco
- Fonction : Auteur
- PersonId : 182241
- IdHAL : dominique-todisco
- ORCID : 0000-0001-7929-0204
- IdRef : 225424770
Attila Çiner
- Fonction : Auteur
- PersonId : 1210910
Amélie Quiquerez
- Fonction : Auteur
- PersonId : 9815
- IdHAL : amelie-quiquerez
- ORCID : 0000-0002-9826-325X
- IdRef : 132598930
Derek Fabel
- Fonction : Auteur
- PersonId : 796853
- ORCID : 0000-0003-2859-3293
Philippe Grandjean
- Fonction : Auteur
- PersonId : 1007619
Carole Nehme
- Fonction : Auteur
- PersonId : 8461
- IdHAL : carole-nehme
- ORCID : 0000-0003-0004-0910
- IdRef : 177884401
Damase Mouralis
- Fonction : Auteur
- PersonId : 16287
- IdHAL : damase-mouralis
- ORCID : 0000-0001-7748-0258
- IdRef : 23328219X
Résumé
Located 51.5°S in the vicinity of the Southern Patagonian Ice Field, Cerro Benítez and the glacial valley of Lago Sofía host several caves and rock shelters that were occupied by megafauna and humans during the Late Pleistocene, including the Mylodon Cave and two of the oldest archaeological sites in Patagonia. During the last glaciation, Cerro Benítez was alternately covered by the Patagonian Ice Sheet and surrounded by an ice-dammed lake which restricted the access to the caves and rock shelters located under its uppermost level, 155 m a.s.l. This study aims to provide a detailed chronology of the deglaciation and lake regression in Cerro Benítez. The glacial fluctuations and the variations of lake level were reconstructed from multi-scale, remote-sensing data and field geomorphological mapping. In addition, we calculated the surface exposure age of 11 erratic blocks located above and on the lacustrine erosional platform using terrestrial cosmogenic 10Be in order to date ice downwasting and lake regression, respectively. Dates of ice downwasting and lake regression events were modelled from prior surface exposure ages using Bayesian statistics. The results suggest that the Patagonian Ice Sheet locally thinned by at least 300 m during MIS 3 in the aftermath of a major glacial advance. Following deglaciation, the ice-dammed lake experienced a slow local regression (ca. 2.5 mm. a−1) until 16.9 ka B2k, interpreted as the result of lake basin tilting due to differential post-glacial isostatic rebound. This initial phase of lake regression was followed by a faster regression caused by the reversal of the lake drainage between 16.9 and 15.4 ka B2k. We assess the chronological model by comparison with uplift and lakeshore erosion rates from the literature and eventually discuss the implications for megafaunal colonisation of the area.
Format du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
10Be chronology of deglaciation and ice-dammed lake regression in the vicinity of the Mylodon Cave (Cerro Benítez, Patagonia, Chile)
|
Résumé |
en
Located 51.5°S in the vicinity of the Southern Patagonian Ice Field, Cerro Benítez and the glacial valley of Lago Sofía host several caves and rock shelters that were occupied by megafauna and humans during the Late Pleistocene, including the Mylodon Cave and two of the oldest archaeological sites in Patagonia. During the last glaciation, Cerro Benítez was alternately covered by the Patagonian Ice Sheet and surrounded by an ice-dammed lake which restricted the access to the caves and rock shelters located under its uppermost level, 155 m a.s.l. This study aims to provide a detailed chronology of the deglaciation and lake regression in Cerro Benítez. The glacial fluctuations and the variations of lake level were reconstructed from multi-scale, remote-sensing data and field geomorphological mapping. In addition, we calculated the surface exposure age of 11 erratic blocks located above and on the lacustrine erosional platform using terrestrial cosmogenic 10Be in order to date ice downwasting and lake regression, respectively. Dates of ice downwasting and lake regression events were modelled from prior surface exposure ages using Bayesian statistics. The results suggest that the Patagonian Ice Sheet locally thinned by at least 300 m during MIS 3 in the aftermath of a major glacial advance. Following deglaciation, the ice-dammed lake experienced a slow local regression (ca. 2.5 mm. a−1) until 16.9 ka B2k, interpreted as the result of lake basin tilting due to differential post-glacial isostatic rebound. This initial phase of lake regression was followed by a faster regression caused by the reversal of the lake drainage between 16.9 and 15.4 ka B2k. We assess the chronological model by comparison with uplift and lakeshore erosion rates from the literature and eventually discuss the implications for megafaunal colonisation of the area.
|
Auteur(s) |
Igor Girault
1
, Dominique Todisco
1
, Attila Çiner
2
, Mehmet Akif Sarıkaya
2
, Cengiz Yıldırım
2
, Amélie Quiquerez
3
, Fabiana Martin
4
, Luis Borrero
5
, Derek Fabel
6
, Philippe Grandjean
7
, Carole Nehme
1
, Damase Mouralis
1
1
IDEES -
Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés
( 97036 )
- 7 Rue Thomas Becket 76821 Mont-Saint-Aignan Cedex
- France
2
AYBE -
Avrasya Yer Bilimleri Enstitüsü = Eurasia Institute of Earth Sciences [Istanbul]
( 133528 )
- Istanbul Technical University, Eurasian Institute of Earth Sciences, 34469 Sarıyer Maslak, Istanbul
- Turquie
3
ARTeHiS -
Archéologie, Terre, Histoire, Sociétés [Dijon]
( 184759 )
- Université de Bourgogne - 6, Bd. Gabriel - 21000 Dijon
- France
4
UMAG -
Universidad de Magallanes
( 350055 )
- Av. Bulnes 01855, Casilla 113-D Punta Arenas - Chile
- Chili
5
UBA -
Universidad de Buenos Aires [Buenos Aires]
( 131288 )
- Viamonte 430/44 C1053ABJ, Ciudad de Buenos Aires
- Argentine
6
SUERC -
Scottish Universities Environmental Research Centre
( 47503 )
- Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK
- Royaume-Uni
7
LGL-TPE -
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
( 153787 )
- Université Claude Bernard, Lyon1 - Campus de la Doua, bâtiment Géode - 2, rue Raphaël Dubois - 69622 Villeurbanne Cedex
École Normale Supérieure de Lyon - 46, Allée d'Italie - 69364 Lyon cedex 07
Université Jean Monnet - Faculté des Sciences et Techniques - 23 rue du Dr Paul Michalon - 42023 Saint Étienne Cedex 02
UMR CNRS 5276
- France
|
Date de publication |
2022-02-15
|
Volume |
278
|
URL éditeur |
https://www.sciencedirect.com/science/article/pii/S0277379121005618
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Page/Identifiant |
107354
|
Domaine(s) |
|
Mots-clés |
en
Pleistocene, Glaciation, South America, Cosmogenic isotopes, Geomorphology, Glacial Chronological modelling, Mylodon Cave
|
DOI | 10.1016/j.quascirev.2021.107354 |
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