Universität zu Köln

Garcia, Juan-Luis, Maldonado, Antonio, de Porras, Maria Eugenia, Delaunay, Amalia Nuevo, Reyes, Omar, Ebensperger, Claudia A., Binnie, Steven A., Luethgens, Christopher and Mendez, Cesar (2019). Early deglaciation and paleolake history of Rio Cisnes Glacier, Patagonian Ice Sheet (44 degrees S). Quat. Res., 91 (1). S. 194 - 218. NEW YORK: CAMBRIDGE UNIV PRESS. ISSN 1096-0287

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Garcia, Juan-Luis UNSPECIFIED UNSPECIFIED UNSPECIFIED Maldonado, Antonio UNSPECIFIED UNSPECIFIED UNSPECIFIED de Porras, Maria Eugenia UNSPECIFIED UNSPECIFIED UNSPECIFIED Delaunay, Amalia Nuevo UNSPECIFIED UNSPECIFIED UNSPECIFIED Reyes, Omar UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebensperger, Claudia A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Binnie, Steven A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luethgens, Christopher UNSPECIFIED UNSPECIFIED UNSPECIFIED Mendez, Cesar UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-160548
DOI:	10.1017/qua.2018.93
Journal or Publication Title:	Quat. Res.
Volume:	91
Number:	1
Page Range:	S. 194 - 218
Date:	2019
Publisher:	CAMBRIDGE UNIV PRESS
Place of Publication:	NEW YORK
ISSN:	1096-0287
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LAGO BUENOS-AIRES; SOUTHERNMOST SOUTH-AMERICA; CENTRAL CHILEAN PATAGONIA; NUCLIDE PRODUCTION-RATES; TORRES DEL PAINE; RADIOCARBON CHRONOLOGY; LATE PLEISTOCENE; POSTGLACIAL VEGETATION; EASTERN FLANK; EXPOSURE AGES Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16054