Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications
The timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available...
Main Authors: | , , , , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | http://www.documentation.ird.fr/hor/fdi:010078983 |
id |
ftird:oai:ird.fr:fdi:010078983 |
---|---|
record_format |
openpolar |
spelling |
ftird:oai:ird.fr:fdi:010078983 2023-05-15T13:55:39+02:00 Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications Palacios, D. Ruiz-Fernandez, J. Oliva, M. Andres, N. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Leanni, Laetitia Gonzalez-Diaz, B. Aster Team ANTARCTIQUE 2020 http://www.documentation.ird.fr/hor/fdi:010078983 EN eng http://www.documentation.ird.fr/hor/fdi:010078983 oai:ird.fr:fdi:010078983 Palacios D., Ruiz-Fernandez J., Oliva M., Andres N., Fernandez-Fernandez J. M., Schimmelpfennig I., Leanni Laetitia, Gonzalez-Diaz B., Aster Team. Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications. Quaternary Science Reviews, 2020, 234, art. 106248 [24p.] Antarctic peninsula Byers peninsula Neoglaciation Surface exposure dating text 2020 ftird 2020-08-21T06:48:01Z The timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available information about neoglacial advances in the South Shetland Islands (SSI) as well as in the broader geographical context of the AP region and Antarctic continent. In order to shed light on the contrasting chronologies existing for neoglacial advances in these regions, we focused on a case study where a detailed picture of the Holocene deglaciation was already available. Lake sediments revealed that Byers Peninsula, west of Livingston Island (SSI), was fully deglaciated during the Holocene Thermal Maximum. To complement this approach, we identified glacially polished bedrock surfaces, erratic boulders and a moraine ridge near the present front of the glacier in the SE corner. We applied cosmogenic ray exposure (CRE) dating using in situ Cl-36 for basalt rocks and Be-10 for granitic rocks in: (i) 8 samples from glacial erratic and ice-rafted boulders, (ii) 2 samples from moraine boulders, (iii) 2 samples from polished bedrock surfaces, and (iv) 1 sample from an erratic boulder deposited on one of these surfaces. The CRE dates indicate that the onset of deglaciation started around 9.9 +/- 1.2 ka, with two phases of glacier expansion during the Mid-Late Holocene forming moraines at similar to 4.1 +/- 0.5 and similar to 1.0 +/- 0.2 ka, respectively. The main neoglacial advances in the AP and the SSI were mostly synchronous and coincided with cold periods, as shown by other records (e.g. glacio-isostatic marine terraces, marine and lake sediments). In addition, these periods of glacial expansion show a similar timing to those recorded in the Arctic. These results suggest that Neoglaciation was driven by global climate forcing in both polar areas despite temporal variations at regional and local scale. Text Antarc* Antarctic Antarctic Peninsula Antarctique* Arctic Livingston Island South Shetland Islands IRD (Institute de recherche pour le développement): Horizon Arctic Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Byers ENVELOPE(-60.283,-60.283,-63.900,-63.900) Byers peninsula ENVELOPE(-61.066,-61.066,-62.633,-62.633) Moraine Ridge ENVELOPE(168.050,168.050,-72.300,-72.300) |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
Antarctic peninsula Byers peninsula Neoglaciation Surface exposure dating |
spellingShingle |
Antarctic peninsula Byers peninsula Neoglaciation Surface exposure dating Palacios, D. Ruiz-Fernandez, J. Oliva, M. Andres, N. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Leanni, Laetitia Gonzalez-Diaz, B. Aster Team Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
topic_facet |
Antarctic peninsula Byers peninsula Neoglaciation Surface exposure dating |
description |
The timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available information about neoglacial advances in the South Shetland Islands (SSI) as well as in the broader geographical context of the AP region and Antarctic continent. In order to shed light on the contrasting chronologies existing for neoglacial advances in these regions, we focused on a case study where a detailed picture of the Holocene deglaciation was already available. Lake sediments revealed that Byers Peninsula, west of Livingston Island (SSI), was fully deglaciated during the Holocene Thermal Maximum. To complement this approach, we identified glacially polished bedrock surfaces, erratic boulders and a moraine ridge near the present front of the glacier in the SE corner. We applied cosmogenic ray exposure (CRE) dating using in situ Cl-36 for basalt rocks and Be-10 for granitic rocks in: (i) 8 samples from glacial erratic and ice-rafted boulders, (ii) 2 samples from moraine boulders, (iii) 2 samples from polished bedrock surfaces, and (iv) 1 sample from an erratic boulder deposited on one of these surfaces. The CRE dates indicate that the onset of deglaciation started around 9.9 +/- 1.2 ka, with two phases of glacier expansion during the Mid-Late Holocene forming moraines at similar to 4.1 +/- 0.5 and similar to 1.0 +/- 0.2 ka, respectively. The main neoglacial advances in the AP and the SSI were mostly synchronous and coincided with cold periods, as shown by other records (e.g. glacio-isostatic marine terraces, marine and lake sediments). In addition, these periods of glacial expansion show a similar timing to those recorded in the Arctic. These results suggest that Neoglaciation was driven by global climate forcing in both polar areas despite temporal variations at regional and local scale. |
format |
Text |
author |
Palacios, D. Ruiz-Fernandez, J. Oliva, M. Andres, N. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Leanni, Laetitia Gonzalez-Diaz, B. Aster Team |
author_facet |
Palacios, D. Ruiz-Fernandez, J. Oliva, M. Andres, N. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Leanni, Laetitia Gonzalez-Diaz, B. Aster Team |
author_sort |
Palacios, D. |
title |
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
title_short |
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
title_full |
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
title_fullStr |
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
title_full_unstemmed |
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications |
title_sort |
timing of formation of neoglacial landforms in the south shetland islands (antarctic peninsula) : regional and global implications |
publishDate |
2020 |
url |
http://www.documentation.ird.fr/hor/fdi:010078983 |
op_coverage |
ANTARCTIQUE |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.283,-60.283,-63.900,-63.900) ENVELOPE(-61.066,-61.066,-62.633,-62.633) ENVELOPE(168.050,168.050,-72.300,-72.300) |
geographic |
Arctic Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Livingston Island Byers Byers peninsula Moraine Ridge |
geographic_facet |
Arctic Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Livingston Island Byers Byers peninsula Moraine Ridge |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctique* Arctic Livingston Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctique* Arctic Livingston Island South Shetland Islands |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010078983 oai:ird.fr:fdi:010078983 Palacios D., Ruiz-Fernandez J., Oliva M., Andres N., Fernandez-Fernandez J. M., Schimmelpfennig I., Leanni Laetitia, Gonzalez-Diaz B., Aster Team. Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications. Quaternary Science Reviews, 2020, 234, art. 106248 [24p.] |
_version_ |
1766262440749694976 |