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Early deglaciation and paleolake history of Rio Cisnes Glacier, Patagonian Ice Sheet (44°S)

Garcia, Juan-Luis
[1]; 
Maldonado, Antonio
[2]; 
de Porras, Maria Eugenia
[2]; 
Delaunay, Amalia Nuevo
[3]; 
Reyes, Omar
[4]; 
Ebensperger, Claudia A.
[1]; 
Binnie, Steven A.
[5]; 
Luethgens, Christopher
[6]; 
Mendez, Cesar
[3]
  • 1
    Pontificia Universidad Catolica de Chile
  • 2
    Ctr Estudios Avanzados Zonas Aridas
  • 3
    Ctr Invest Ecosistemas Patagonia
  • 4
    Universidad de Magallanes  
  • 5
    University of Cologne
  • 6
    BOKU University
DOI
Date Issued
2019-1
Type
Artículo
Journal
Quaternary Research (United States)
ISSN
0033-5894
1096-0287
Open Access
closed
Volume
91
Start page
194
End page
217
Links
The timing, structure, and landscape change during the Patagonian Ice Sheet deglaciation remains unresolved. In this article, we provide a geomorphic, stratigraphic, and geochronological deglacial record of Rio Cisnes Glacier at 44 degrees S and also from the nearby Rio Nirehuao and Rio El Toqui valleys (45 degrees S) in Chilean Patagonia. Our C-14, Be-10, and optically stimulated luminescence data indicate that after the last glacial maximum, Rio Cisnes Glacier experienced 100 km deglaciation between >19.0 and 12.3 ka, accompanied by the formation of large glacial paleolakes. Deglaciation was interrupted by several ice readvances, and by 16.9 +/- 0.3 ka, Rio Cisnes Glacier extended only 40% of its full glacial extent. The deglaciation of Rio Cisnes Glacier and other sensitive Patagonian glaciers occurred at least 1 ka earlier than the ca. 17.8 ka normally assumed for the local termination, coincident with West Antarctic isotope records. This early deglaciation can be linked to an orbital forcing-driven decline of Southern Ocean sea ice associated with a distinct atmospheric warming that is apparent for West Antarctica through Patagonia.
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