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Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)
| Content Provider | Scilit |
|---|---|
| Author | García, Juan-Luis Maldonado, Antonio de Porras, María Eugenia Delaunay, Amalia Nuevo Reyes, Omar Ebensperger, Claudia A. Binnie, Steven A. Lüthgens, Christopher Méndez, César |
| Copyright Year | 2018 |
| Description | 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 Río Cisnes Glacier at 44°S and also from the nearby Río Ñirehuao and Río El Toqui valleys (45°S) in Chilean Patagonia. Our$ ^{14}$C,$ ^{10}$Be, and optically stimulated luminescence data indicate that after the last glacial maximum, Río 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, Río Cisnes Glacier extended only ~40% of its full glacial extent. The deglaciation of Río 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. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/3F8F57C5872C760113C6B907CA53643E/S0033589418000935a.pdf/div-class-title-early-deglaciation-and-paleolake-history-of-rio-cisnes-glacier-patagonian-ice-sheet-44-s-div.pdf |
| Ending Page | 217 |
| Page Count | 24 |
| Starting Page | 194 |
| ISSN | 00335894 |
| e-ISSN | 10960287 |
| DOI | 10.1017/qua.2018.93 |
| Journal | Quaternary Research |
| Issue Number | 1 |
| Volume Number | 91 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2019-01-01 |
| Access Restriction | Open |
| Subject Keyword | Quaternary Research Physical Geography Last Termination interglacial Transition Last Deglaciation Patagonian Ice Sheet Glacial Geomorphology 10be Dating Osl Dating 14c Dating |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth-Surface Processes Arts and Humanities |
