Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia
Understanding the timing of past glacial advances in Patagonia is of global climatic importance because of the insight this can provide into the influence on glacier behaviour of changes in temperature and precipitation related to the Southern Westerlies. In this paper we present new luminescence ag...
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ftkeeleuniv:oai:eprints.keele.ac.uk:2906 2023-07-30T04:04:14+02:00 Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia Smedley, RK Glasser, NF Duller, GAT 2016-02-15 text https://eprints.keele.ac.uk/id/eprint/2906/ https://eprints.keele.ac.uk/id/eprint/2906/1/Smedley%20et%20al.%202016%20%28QSR%29%20-%20Patagonia.pdf https://doi.org/10.1016/j.quascirev.2015.12.010 en eng Elsevier https://eprints.keele.ac.uk/id/eprint/2906/1/Smedley%20et%20al.%202016%20%28QSR%29%20-%20Patagonia.pdf Smedley, RK, Glasser, NF and Duller, GAT (2016) Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia. Quaternary Science Reviews, 134. 59 -73. doi:10.1016/j.quascirev.2015.12.010 cc_by_4 GB Physical geography Article PeerReviewed 2016 ftkeeleuniv https://doi.org/10.1016/j.quascirev.2015.12.010 2023-07-10T21:15:33Z Understanding the timing of past glacial advances in Patagonia is of global climatic importance because of the insight this can provide into the influence on glacier behaviour of changes in temperature and precipitation related to the Southern Westerlies. In this paper we present new luminescence ages determined using single grains of K-feldspar from proglacial outwash sediments that were deposited by the Patagonian Ice Sheet around Lago Buenos Aires (∼46 °S), east of the contemporary Northern Patagonian Icefield. The new luminescence ages indicate that major outwash accumulations formed around ∼110 ± 20 ka to 140 ± 20 ka and that these correspond to the Moreno I and II moraine ridges, which were previously dated using cosmogenic isotope dating to 150 ± 30 ka. Luminescence dating at Lago Buenos Aires has also identified outwash sediments that were deposited during glacial advances ∼30.8 ± 5.7 ka and ∼34.0 ± 6.1 ka (MIS 3) that are not recorded in the moraine record. Younger outwash accumulations were then deposited between ∼14.7 ± 2.1 and 26.2 ± 1.6 ka which correspond to the Fenix I – V moraine ridges. The combined chronology suggests that glacial advances occurred ∼110 ± 20 ka to 150 ± 30 ka (MIS 6), ∼30.8 ± 5.7 ka to ∼34.0 ± 6.1 ka (MIS 3), and ∼14.7 ± 2.1 to 26.2 ± 1.6 ka (MIS 2) at Lago Buenos Aires. Overall luminescence dating using single grains of K-feldspar has excellent potential to contribute towards the ever-increasing geochronological dataset constraining the timings of glacial advances in Patagonia. Article in Journal/Newspaper Ice Sheet Keele University: Keele Research Repository Moreno ENVELOPE(-62.300,-62.300,-64.083,-64.083) Patagonia Quaternary Science Reviews 134 59 73 |
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Open Polar |
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Keele University: Keele Research Repository |
op_collection_id |
ftkeeleuniv |
language |
English |
topic |
GB Physical geography |
spellingShingle |
GB Physical geography Smedley, RK Glasser, NF Duller, GAT Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
topic_facet |
GB Physical geography |
description |
Understanding the timing of past glacial advances in Patagonia is of global climatic importance because of the insight this can provide into the influence on glacier behaviour of changes in temperature and precipitation related to the Southern Westerlies. In this paper we present new luminescence ages determined using single grains of K-feldspar from proglacial outwash sediments that were deposited by the Patagonian Ice Sheet around Lago Buenos Aires (∼46 °S), east of the contemporary Northern Patagonian Icefield. The new luminescence ages indicate that major outwash accumulations formed around ∼110 ± 20 ka to 140 ± 20 ka and that these correspond to the Moreno I and II moraine ridges, which were previously dated using cosmogenic isotope dating to 150 ± 30 ka. Luminescence dating at Lago Buenos Aires has also identified outwash sediments that were deposited during glacial advances ∼30.8 ± 5.7 ka and ∼34.0 ± 6.1 ka (MIS 3) that are not recorded in the moraine record. Younger outwash accumulations were then deposited between ∼14.7 ± 2.1 and 26.2 ± 1.6 ka which correspond to the Fenix I – V moraine ridges. The combined chronology suggests that glacial advances occurred ∼110 ± 20 ka to 150 ± 30 ka (MIS 6), ∼30.8 ± 5.7 ka to ∼34.0 ± 6.1 ka (MIS 3), and ∼14.7 ± 2.1 to 26.2 ± 1.6 ka (MIS 2) at Lago Buenos Aires. Overall luminescence dating using single grains of K-feldspar has excellent potential to contribute towards the ever-increasing geochronological dataset constraining the timings of glacial advances in Patagonia. |
format |
Article in Journal/Newspaper |
author |
Smedley, RK Glasser, NF Duller, GAT |
author_facet |
Smedley, RK Glasser, NF Duller, GAT |
author_sort |
Smedley, RK |
title |
Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
title_short |
Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
title_full |
Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
title_fullStr |
Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
title_full_unstemmed |
Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia |
title_sort |
luminescence dating of glacial advances at lago buenos aires (~46 s), patagonia |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://eprints.keele.ac.uk/id/eprint/2906/ https://eprints.keele.ac.uk/id/eprint/2906/1/Smedley%20et%20al.%202016%20%28QSR%29%20-%20Patagonia.pdf https://doi.org/10.1016/j.quascirev.2015.12.010 |
long_lat |
ENVELOPE(-62.300,-62.300,-64.083,-64.083) |
geographic |
Moreno Patagonia |
geographic_facet |
Moreno Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://eprints.keele.ac.uk/id/eprint/2906/1/Smedley%20et%20al.%202016%20%28QSR%29%20-%20Patagonia.pdf Smedley, RK, Glasser, NF and Duller, GAT (2016) Luminescence dating of glacial advances at Lago Buenos Aires (~46 S), Patagonia. Quaternary Science Reviews, 134. 59 -73. doi:10.1016/j.quascirev.2015.12.010 |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.12.010 |
container_title |
Quaternary Science Reviews |
container_volume |
134 |
container_start_page |
59 |
op_container_end_page |
73 |
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1772815494000148480 |