000075970 001__ 75970
000075970 005__ 20200716101511.0
000075970 0247_ $$2doi$$a10.1016/j.quascirev.2018.10.036
000075970 0248_ $$2sideral$$a109110
000075970 037__ $$aART-2019-109110
000075970 041__ $$aeng
000075970 100__ $$aThorndycraft, V.R.
000075970 245__ $$aGlacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet
000075970 260__ $$c2019
000075970 5060_ $$aAccess copy available to the general public$$fUnrestricted
000075970 5203_ $$aModelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 °S) indicate that Atlantic-Pacific drainage reversals may have caused freshwater forcing of regional climate. However, much of the region remains unmapped in detail and available geochronological data is equivocal, leading to multiple published palaeolake evolution models. We evaluate these models through new geomorphological mapping from the Baker valley; cosmogenic dating of moraine boulders that demonstrates an Antarctic Cold Reversal ice readvance that blocked drainage through the Río Baker; an altitudinal-based review of published geochronology; and regional analysis of shoreline glacio-isostasy and palaeolake levels. We use these datasets to present a new regional palaeolake evolution model underpinned by Bayesian age modelling. We demonstrate that 103 km3 of freshwater was released to the Pacific over at least 6 drainage events from before 15.3–15.0 cal yr BP to the early Holocene. The final stages of lake drainage involved catastrophic flooding along the Baker valley, evidenced by high magnitude flood landforms such as boulder bars, likely caused by failure of large valley floor moraine dams. We place these drainage events in the context of Late Quaternary meltwater pathways associated with advance/retreat of the Patagonian Ice Sheet and early human occupation across the region. Although broad patterns of ice retreat and lake formation may be similar across Patagonia, driven by Southern Hemisphere palaeoclimate, regional topographic settings likely resulted in spatial and temporal heterogeneity of Atlantic-Pacific drainage reorganisation across southernmost South America.
000075970 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000075970 590__ $$a3.803$$b2019
000075970 591__ $$aGEOGRAPHY, PHYSICAL$$b10 / 50 = 0.2$$c2019$$dQ1$$eT1
000075970 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b30 / 198 = 0.152$$c2019$$dQ1$$eT1
000075970 592__ $$a2.235$$b2019
000075970 593__ $$aArcheology$$c2019$$dQ1
000075970 593__ $$aArcheology (arts and humanities)$$c2019$$dQ1
000075970 593__ $$aGlobal and Planetary Change$$c2019$$dQ1
000075970 593__ $$aGeology$$c2019$$dQ1
000075970 593__ $$aEcology, Evolution, Behavior and Systematics$$c2019$$dQ1
000075970 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000075970 700__ $$aBendle, J.M.
000075970 700__ $$aBenito, G.
000075970 700__ $$aDavies, B.J.
000075970 700__ $$0(orcid)0000-0002-1304-2264$$aSancho, C.$$uUniversidad de Zaragoza
000075970 700__ $$aPalmer, A.P.
000075970 700__ $$aFabel, D.
000075970 700__ $$aMedialdea, A.
000075970 700__ $$aMartin, J.R.V.
000075970 7102_ $$12000$$2427$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Externa
000075970 773__ $$g203 (2019), 102-127$$pQuat. sci. rev.$$tQuaternary Science Reviews$$x0277-3791
000075970 8564_ $$s1769403$$uhttps://zaguan.unizar.es/record/75970/files/texto_completo.pdf$$yVersión publicada
000075970 8564_ $$s102145$$uhttps://zaguan.unizar.es/record/75970/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000075970 909CO $$ooai:zaguan.unizar.es:75970$$particulos$$pdriver
000075970 951__ $$a2020-07-16-09:18:58
000075970 980__ $$aARTICLE