Universität zu Köln

Thorndycraft, Varyl R., Bendle, Jacob M., Benito, Gerardo ORCID: 0000-0003-0724-1790, Davies, Bethan J., Sancho, Carlos, Palmer, Adrian P., Fabel, Derek ORCID: 0000-0003-2859-3293, Medialdea, Alicia ORCID: 0000-0001-5895-0736 and Martin, Julian R. V. (2019). Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet. Quat. Sci. Rev., 203. S. 102 - 128. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

Modelling experiments of drainage events from proglacial lakes of the Rio Baker catchment (central Patagonia, 46-48 degrees 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 Rio 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 10(3) km(3) 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. (C) 2018 The Authors. Published by Elsevier Ltd.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Thorndycraft, Varyl R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bendle, Jacob M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Benito, Gerardo UNSPECIFIED orcid.org/0000-0003-0724-1790 UNSPECIFIED Davies, Bethan J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sancho, Carlos UNSPECIFIED UNSPECIFIED UNSPECIFIED Palmer, Adrian P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fabel, Derek UNSPECIFIED orcid.org/0000-0003-2859-3293 UNSPECIFIED Medialdea, Alicia UNSPECIFIED orcid.org/0000-0001-5895-0736 UNSPECIFIED Martin, Julian R. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-140461
DOI:	10.1016/j.quascirev.2018.10.036
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	203
Page Range:	S. 102 - 128
Date:	2019
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LAGO BUENOS-AIRES; TORRES DEL PAINE; CHILEAN PATAGONIA; ULTIMA ESPERANZA; GENERAL CARRERA; YOUNGER DRYAS; GEOMORPHIC RECORDS; CLIMATE INFERENCES; SOUTHERN PATAGONIA; COSMOGENIC BE-10 Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14046