10Be chronology of deglaciation and ice-dammed lake regression in the vicinity of the Mylodon Cave (Cerro Benítez, Patagonia, Chile)

Igor Girault*, Dominique Todisco, Attila Çiner, Mehmet Akif Sarıkaya, Cengiz Yıldırım, Amélie Quiquerez, Fabiana Martin, Luis Borrero, Derek Fabel, Philippe Grandjean, Carole Nehme, Damase Mouralis

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Özet

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.

Orijinal dilİngilizce
Makale numarası107354
DergiQuaternary Science Reviews
Hacim278
DOI'lar
Yayın durumuYayınlandı - 15 Şub 2022

Bibliyografik not

Publisher Copyright:
© 2022 Elsevier Ltd

Finansman

This work was funded by the Chilean FONDECYT (projects 1150845 and 1180272), the French CNRS (PICS GEOCEBE), the Istanbul Technical University (research project TGA-2017-40610), a PhD studentship from the university of Rouen awarded to I.G. and a mobility grant from the French Institut des Amériques awarded to I.G. Pléiades satellite images were acquired from Airbus DS Geo via Dinamis. We acknowledge Valentina García Huidobro Mery, Yiara Vela-Ruiz Figueroa, Florentina Pérez Martin, Erik Lukoviek and José Díaz Tavie for their assistance on the field, Céline Colange and Olivier Gillet for their assistance to collect and process the satellite images, Kim Genuite for his help in using Chronomodel and Joël Rodet for our scientific exchanges. We gratefully thank the CONAF, Ciro Barría, Alejandra Olivares, Rodrigo Rodríguez and the other guards of the Mylodon Cave Natural Monument for their hospitality and assistance during our fieldwork, and Ernesto Helmer, Francisca Helmer, Jorge Canales Helmer and Mario Margoni for their permission to work on their properties. We thank Juan-Luis Garcia and Varyl Thorndycraft for their helpful review. This work was funded by the Chilean FONDECYT (projects 1150845 and 1180272 ), the French CNRS (PICS GEOCEBE), the Istanbul Technical University (research project TGA-2017-40610 ), a PhD studentship from the university of Rouen awarded to I.G. and a mobility grant from the French Institut des Amériques awarded to I.G. Pléiades satellite images were acquired from Airbus DS Geo via Dinamis. We acknowledge Valentina García Huidobro Mery, Yiara Vela-Ruiz Figueroa, Florentina Pérez Martin, Erik Lukoviek and José Díaz Tavie for their assistance on the field, Céline Colange and Olivier Gillet for their assistance to collect and process the satellite images, Kim Genuite for his help in using Chronomodel and Joël Rodet for our scientific exchanges. We gratefully thank the CONAF, Ciro Barría, Alejandra Olivares, Rodrigo Rodríguez and the other guards of the Mylodon Cave Natural Monument for their hospitality and assistance during our fieldwork, and Ernesto Helmer, Francisca Helmer, Jorge Canales Helmer and Mario Margoni for their permission to work on their properties. We thank Juan-Luis Garcia and Varyl Thorndycraft for their helpful review.

FinansörlerFinansör numarası
Airbus DS Geo via Dinamis
CONAF
Institut des Amériques
Fondo Nacional de Desarrollo Científico y Tecnológico1150845, 1180272
Centre National de la Recherche Scientifique
Istanbul Teknik ÜniversitesiTGA-2017-40610

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