Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM
Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last glacial cycle. To unders...
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ftuglasgow:oai:eprints.gla.ac.uk:278116 2023-08-27T04:10:04+02:00 Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM Çiner, Attila Sarıkaya, Mehmet Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek 2022-10-01 text https://eprints.gla.ac.uk/278116/ https://eprints.gla.ac.uk/278116/1/278116.pdf en eng Elsevier https://eprints.gla.ac.uk/278116/1/278116.pdf Çiner, A., Sarıkaya, M. A., Yıldırım, C., Girault, I., Todisco, D., Martin, F., Borrero, L. and Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> (2022) Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM. Geomorphology <https://eprints.gla.ac.uk/view/journal_volume/Geomorphology.html>, 414, 108381. (doi:10.1016/j.geomorph.2022.108381 <https://doi.org/10.1016/j.geomorph.2022.108381>) cc_by_nc_nd_4 Articles PeerReviewed 2022 ftuglasgow https://doi.org/10.1016/j.geomorph.2022.108381 2023-08-03T22:09:29Z Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last glacial cycle. To understand the variations in the gLGM vs local LGM record, we studied the Lago Aníbal Pinto area (52°00′ S, 72°40′ E; Chile), where several moraine belts were deposited by one of the eastward-flowing southern Patagonian Ice Sheet (PIS) outlet ice lobes; the Última Esperanza. We report eight 10Be terrestrial cosmogenic nuclides (TCN) surface ages from granitic moraine boulders. Our weighted average age obtained from the southern part of the Río Turbio moraine belt yields 50.7 ± 2.4 ka (oldest boulder age; 53.8 ± 5.3 ka) and confirms the greatest extent of the local Last Glacial Maximum (lLGM) during Marine Isotope Stage 3 (MIS 3) in the previously dated northern moraines from the same belt. Our 10Be TCN age (32.6 ± 2.2 ka) derived from the Dos Lagunas moraine, which makes up the northernmost margin of the Última Esperanza ice lobe's Arauco advance, also validates the MIS 3 timing. Following the formation of Arauco moraines, the Última Esperanza ice lobe was split into three main tributaries in the south, which formed three restricted and previously undated moraine complexes. We dated one of them, the Aníbal Pinto moraine complex. Whereas the highest moraine yielded the oldest age (28.3 ± 2.2 ka), lower moraine's surface that was later truncated as a lacustrine erosional platform, yielded younger boulder ages (weighted average age = 18.9 ± 1.0 ka; oldest boulder age = 19.0 ± 1.5 ka), indicating they were deposited under the Pinto Lake level. Our new age data allow us to propose a new chronology for the Aníbal Pinto moraine complex and consolidate previously published ages from other moraine belts. We attribute the Aníbal Pinto moraine complex to early gLGM (MIS 2), emphasising that the gLGM was half the extent of lLGM in the ... Article in Journal/Newspaper Ice Sheet University of Glasgow: Enlighten - Publications Arauco ENVELOPE(-70.533,-70.533,-68.767,-68.767) Esperanza ENVELOPE(-56.983,-56.983,-63.400,-63.400) Patagonia Geomorphology 414 108381 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last glacial cycle. To understand the variations in the gLGM vs local LGM record, we studied the Lago Aníbal Pinto area (52°00′ S, 72°40′ E; Chile), where several moraine belts were deposited by one of the eastward-flowing southern Patagonian Ice Sheet (PIS) outlet ice lobes; the Última Esperanza. We report eight 10Be terrestrial cosmogenic nuclides (TCN) surface ages from granitic moraine boulders. Our weighted average age obtained from the southern part of the Río Turbio moraine belt yields 50.7 ± 2.4 ka (oldest boulder age; 53.8 ± 5.3 ka) and confirms the greatest extent of the local Last Glacial Maximum (lLGM) during Marine Isotope Stage 3 (MIS 3) in the previously dated northern moraines from the same belt. Our 10Be TCN age (32.6 ± 2.2 ka) derived from the Dos Lagunas moraine, which makes up the northernmost margin of the Última Esperanza ice lobe's Arauco advance, also validates the MIS 3 timing. Following the formation of Arauco moraines, the Última Esperanza ice lobe was split into three main tributaries in the south, which formed three restricted and previously undated moraine complexes. We dated one of them, the Aníbal Pinto moraine complex. Whereas the highest moraine yielded the oldest age (28.3 ± 2.2 ka), lower moraine's surface that was later truncated as a lacustrine erosional platform, yielded younger boulder ages (weighted average age = 18.9 ± 1.0 ka; oldest boulder age = 19.0 ± 1.5 ka), indicating they were deposited under the Pinto Lake level. Our new age data allow us to propose a new chronology for the Aníbal Pinto moraine complex and consolidate previously published ages from other moraine belts. We attribute the Aníbal Pinto moraine complex to early gLGM (MIS 2), emphasising that the gLGM was half the extent of lLGM in the ... |
format |
Article in Journal/Newspaper |
author |
Çiner, Attila Sarıkaya, Mehmet Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek |
spellingShingle |
Çiner, Attila Sarıkaya, Mehmet Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
author_facet |
Çiner, Attila Sarıkaya, Mehmet Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek |
author_sort |
Çiner, Attila |
title |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_short |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_full |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_fullStr |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_full_unstemmed |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_sort |
terrestrial cosmogenic 10be dating of the última esperanza ice lobe moraines (52°s, patagonia) indicates the global last glacial maximum (lgm) extent was half of the local lgm |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://eprints.gla.ac.uk/278116/ https://eprints.gla.ac.uk/278116/1/278116.pdf |
long_lat |
ENVELOPE(-70.533,-70.533,-68.767,-68.767) ENVELOPE(-56.983,-56.983,-63.400,-63.400) |
geographic |
Arauco Esperanza Patagonia |
geographic_facet |
Arauco Esperanza Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://eprints.gla.ac.uk/278116/1/278116.pdf Çiner, A., Sarıkaya, M. A., Yıldırım, C., Girault, I., Todisco, D., Martin, F., Borrero, L. and Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> (2022) Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM. Geomorphology <https://eprints.gla.ac.uk/view/journal_volume/Geomorphology.html>, 414, 108381. (doi:10.1016/j.geomorph.2022.108381 <https://doi.org/10.1016/j.geomorph.2022.108381>) |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1016/j.geomorph.2022.108381 |
container_title |
Geomorphology |
container_volume |
414 |
container_start_page |
108381 |
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1775351815599030272 |