TY - JOUR
T1 - Late Glacial and Holocene Palaeolake History of the ultima Esperanza Region of Southern Patagonia
AU - Roberts, Stephen J.
AU - McCulloch, Robert D.
AU - Emmings, Joseph F.
AU - Davies, Sarah J.
AU - Van Nieuwenhuyze, Wim
AU - Sterken, Mieke
AU - Heirman, Katrien
AU - Van Wichelen, Jeroen
AU - Diaz, Carolina
AU - Van de Vyver, Evelien
AU - Whittle, Alex
AU - Vyverman, Wim
AU - Hodgson, Dominic A.
AU - Verleyen, Elie
PY - 2022/3/29
Y1 - 2022/3/29
N2 - We undertook multi-proxy analyses on two sediment cores from Lago Pato, a small lake basin at 51 degrees S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake-level change in the TdP and ultima Esperanza region over the last similar to 30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Ice Field during the Last Glacial and in a transitional climatic zone of Southern Patagonia sensitive to seasonal- to millennial-scale changes in the Southern Hemisphere Westerly Winds (SWW). Results show that a deep ice-dammed and enlarged palaeolake encompassed Lago del Toro and Lago Pato c. 30-20 ka after the ice had retreated from local-Last Glacial Maximum (l-LGM) limits at c. 48-34 ka and during the build-up to the global-Last Glacial Maximum (g-LGM), c. 26-19 ka. Gaps in both sediment records between c. 20-13.4 ka and c. 20-10 ka suggest hiatuses in sediment accumulation during the g-LGM and Antarctic Cold Reversal (ACR) readvances and/or removal by lake lowering or flushing during the Late Glacial-early Holocene. The palaeolake level dropped from >100 m a.s.l. to similar to 40-50 m a.s.l. towards the end of the ACR c. 13.4-13.0 ka, creating a shallower glaciolacustrine environment dammed by an ice tongue in the Estancia Puerto Consuelo-ultima Esperanza fjord. Further lowering of the enlarged palaeolake level occurred when the ice thinned to
AB - We undertook multi-proxy analyses on two sediment cores from Lago Pato, a small lake basin at 51 degrees S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake-level change in the TdP and ultima Esperanza region over the last similar to 30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Ice Field during the Last Glacial and in a transitional climatic zone of Southern Patagonia sensitive to seasonal- to millennial-scale changes in the Southern Hemisphere Westerly Winds (SWW). Results show that a deep ice-dammed and enlarged palaeolake encompassed Lago del Toro and Lago Pato c. 30-20 ka after the ice had retreated from local-Last Glacial Maximum (l-LGM) limits at c. 48-34 ka and during the build-up to the global-Last Glacial Maximum (g-LGM), c. 26-19 ka. Gaps in both sediment records between c. 20-13.4 ka and c. 20-10 ka suggest hiatuses in sediment accumulation during the g-LGM and Antarctic Cold Reversal (ACR) readvances and/or removal by lake lowering or flushing during the Late Glacial-early Holocene. The palaeolake level dropped from >100 m a.s.l. to similar to 40-50 m a.s.l. towards the end of the ACR c. 13.4-13.0 ka, creating a shallower glaciolacustrine environment dammed by an ice tongue in the Estancia Puerto Consuelo-ultima Esperanza fjord. Further lowering of the enlarged palaeolake level occurred when the ice thinned to
U2 - 10.3389/feart.2022.813396
DO - 10.3389/feart.2022.813396
M3 - A1: Web of Science-article
VL - 10
ER -