Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet
Modelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 ⁰S) 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 geoch...
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ftuglasgow:oai:eprints.gla.ac.uk:176018 2023-05-15T13:54:32+02:00 Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet Thorndycraft, Varyl R. Bendle, Jacob M. Benito, Gerardo Davies, Bethan J. Sancho, Carlos Palmer, Adrian P. Fabel, Derek Medialdea, Alicia Martin, Julian R.V. 2019-01 text http://eprints.gla.ac.uk/176018/ http://eprints.gla.ac.uk/176018/1/176018.pdf en eng Elsevier http://eprints.gla.ac.uk/176018/1/176018.pdf Thorndycraft, V. R., Bendle, J. M., Benito, G., Davies, B. J., Sancho, C., Palmer, A. P., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Medialdea, A. and Martin, J. R.V. (2019) Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 203, pp. 102-127. (doi:10.1016/j.quascirev.2018.10.036 <http://dx.doi.org/10.1016/j.quascirev.2018.10.036>) cc_by_4 CC-BY Articles PeerReviewed 2019 ftuglasgow https://doi.org/10.1016/j.quascirev.2018.10.036 2020-05-28T22:24:59Z Modelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 ⁰S) 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. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet University of Glasgow: Enlighten - Publications Antarctic Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Pacific Patagonia The Baker ENVELOPE(-54.765,-54.765,49.667,49.667) Quaternary Science Reviews 203 102 127 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
Modelling experiments of drainage events from proglacial lakes of the Río Baker catchment (central Patagonia, 46–48 ⁰S) 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. |
format |
Article in Journal/Newspaper |
author |
Thorndycraft, Varyl R. Bendle, Jacob M. Benito, Gerardo Davies, Bethan J. Sancho, Carlos Palmer, Adrian P. Fabel, Derek Medialdea, Alicia Martin, Julian R.V. |
spellingShingle |
Thorndycraft, Varyl R. Bendle, Jacob M. Benito, Gerardo Davies, Bethan J. Sancho, Carlos Palmer, Adrian P. Fabel, Derek Medialdea, Alicia Martin, Julian R.V. Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
author_facet |
Thorndycraft, Varyl R. Bendle, Jacob M. Benito, Gerardo Davies, Bethan J. Sancho, Carlos Palmer, Adrian P. Fabel, Derek Medialdea, Alicia Martin, Julian R.V. |
author_sort |
Thorndycraft, Varyl R. |
title |
Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
title_short |
Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
title_full |
Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
title_fullStr |
Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
title_full_unstemmed |
Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet |
title_sort |
glacial lake evolution and atlantic-pacific drainage reversals during deglaciation of the patagonian ice sheet |
publisher |
Elsevier |
publishDate |
2019 |
url |
http://eprints.gla.ac.uk/176018/ http://eprints.gla.ac.uk/176018/1/176018.pdf |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-54.765,-54.765,49.667,49.667) |
geographic |
Antarctic Glacial Lake Pacific Patagonia The Baker |
geographic_facet |
Antarctic Glacial Lake Pacific Patagonia The Baker |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
http://eprints.gla.ac.uk/176018/1/176018.pdf Thorndycraft, V. R., Bendle, J. M., Benito, G., Davies, B. J., Sancho, C., Palmer, A. P., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Medialdea, A. and Martin, J. R.V. (2019) Glacial lake evolution and Atlantic-Pacific drainage reversals during deglaciation of the Patagonian Ice Sheet. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 203, pp. 102-127. (doi:10.1016/j.quascirev.2018.10.036 <http://dx.doi.org/10.1016/j.quascirev.2018.10.036>) |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.10.036 |
container_title |
Quaternary Science Reviews |
container_volume |
203 |
container_start_page |
102 |
op_container_end_page |
127 |
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1766260491953373184 |