Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica.
Considerable controversy exists over whether or not extensive glaciation occurred during the global Last Glacial Maximum (LGM) in the Larsemann Hills. In this study we use the in situ produced cosmogenic nuclide 10Be (half life 1.51 Ma) to provide minimum exposure ages for six bedrock samples and on...
Main Authors: | , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell
2010
|
Subjects: | |
Online Access: | http://apo.ansto.gov.au/dspace/handle/10238/1964 http://www.cnki.com.cn/Article/CJFDTotal-DZXW201003010.htm |
id |
ftansto:oai:apo-prod.ansto.gov.au:10238/1964 |
---|---|
record_format |
openpolar |
spelling |
ftansto:oai:apo-prod.ansto.gov.au:10238/1964 2023-05-15T13:36:16+02:00 Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. Huang, F Li, G Liu, XH Kong, P Ju, Y Fink, D Fang, A Yu, L 2010-06-01 http://apo.ansto.gov.au/dspace/handle/10238/1964 http://www.cnki.com.cn/Article/CJFDTotal-DZXW201003010.htm en eng Wiley-Blackwell Huang, F., Li, G., Liu, X., Kong, P., Ju, Y., Fink, D., Fang, A., & Yu, L. (2010). Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. Acta Geologica Sinica-English Edition, 84(3), 543-548. 1000-9515 http://www.cnki.com.cn/Article/CJFDTotal-DZXW201003010.htm http://apo.ansto.gov.au/dspace/handle/10238/1964 Antarctica Beryllium 10 Erosion Environmental exposure Age estimation Glaciers Journal Article 2010 ftansto 2020-09-07T22:28:35Z Considerable controversy exists over whether or not extensive glaciation occurred during the global Last Glacial Maximum (LGM) in the Larsemann Hills. In this study we use the in situ produced cosmogenic nuclide 10Be (half life 1.51 Ma) to provide minimum exposure ages for six bedrock samples and one erratic boulder in order to determine the last period of deglaciation in the Larsemann Hills and on the neighboring Bolingen Islands. Three bedrock samples taken from Friendship Mountain (the highest peak on the Mirror Peninsula, Larsemann Hills; ∼2 km from the ice sheet) have minimum exposure ages ranging from 40.0 to 44.7 ka. The erratic boulder from Peak 106 (just at the edge of the ice sheet) has a younger minimum exposure age of only 8.8 ka. The minimum exposure ages for two bedrock samples from Blundell Peak (the highest peak on Stornes Peninsula, Larsemann Hills; ∼2 km from the ice sheet) are about 17 and 18 ka. On the Bolingen Islands (southwest to the Larsemann Hills; ∼10 km from the ice sheet), the minimum exposure age for one bedrock sample is similar to that at Friendship Mountain (i.e., 44 ka). Our results indicate that the bedrock exposure in the Larsemann Hills and on the neighboring Bolingen Islands commenced obviously before the global LGM (i.e., 20–22 ka), and the bedrock erosion rates at the Antarctic coast areas may be obviously higher than in the interior land. © 2010, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Antarctic Blundell ENVELOPE(76.111,76.111,-69.427,-69.427) Blundell Peak ENVELOPE(76.104,76.104,-69.426,-69.426) Bolingen Islands ENVELOPE(75.696,75.696,-69.532,-69.532) East Antarctica Larsemann Hills ENVELOPE(76.217,76.217,-69.400,-69.400) Stornes ENVELOPE(76.099,76.099,-69.429,-69.429) Stornes Peninsula ENVELOPE(76.101,76.101,-69.424,-69.424) The Antarctic |
institution |
Open Polar |
collection |
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online |
op_collection_id |
ftansto |
language |
English |
topic |
Antarctica Beryllium 10 Erosion Environmental exposure Age estimation Glaciers |
spellingShingle |
Antarctica Beryllium 10 Erosion Environmental exposure Age estimation Glaciers Huang, F Li, G Liu, XH Kong, P Ju, Y Fink, D Fang, A Yu, L Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
topic_facet |
Antarctica Beryllium 10 Erosion Environmental exposure Age estimation Glaciers |
description |
Considerable controversy exists over whether or not extensive glaciation occurred during the global Last Glacial Maximum (LGM) in the Larsemann Hills. In this study we use the in situ produced cosmogenic nuclide 10Be (half life 1.51 Ma) to provide minimum exposure ages for six bedrock samples and one erratic boulder in order to determine the last period of deglaciation in the Larsemann Hills and on the neighboring Bolingen Islands. Three bedrock samples taken from Friendship Mountain (the highest peak on the Mirror Peninsula, Larsemann Hills; ∼2 km from the ice sheet) have minimum exposure ages ranging from 40.0 to 44.7 ka. The erratic boulder from Peak 106 (just at the edge of the ice sheet) has a younger minimum exposure age of only 8.8 ka. The minimum exposure ages for two bedrock samples from Blundell Peak (the highest peak on Stornes Peninsula, Larsemann Hills; ∼2 km from the ice sheet) are about 17 and 18 ka. On the Bolingen Islands (southwest to the Larsemann Hills; ∼10 km from the ice sheet), the minimum exposure age for one bedrock sample is similar to that at Friendship Mountain (i.e., 44 ka). Our results indicate that the bedrock exposure in the Larsemann Hills and on the neighboring Bolingen Islands commenced obviously before the global LGM (i.e., 20–22 ka), and the bedrock erosion rates at the Antarctic coast areas may be obviously higher than in the interior land. © 2010, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com |
format |
Article in Journal/Newspaper |
author |
Huang, F Li, G Liu, XH Kong, P Ju, Y Fink, D Fang, A Yu, L |
author_facet |
Huang, F Li, G Liu, XH Kong, P Ju, Y Fink, D Fang, A Yu, L |
author_sort |
Huang, F |
title |
Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
title_short |
Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
title_full |
Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
title_fullStr |
Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
title_full_unstemmed |
Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. |
title_sort |
minimum bedrock exposure ages and their implications: larsemann hills and neighboring bolingen islands, east antarctica. |
publisher |
Wiley-Blackwell |
publishDate |
2010 |
url |
http://apo.ansto.gov.au/dspace/handle/10238/1964 http://www.cnki.com.cn/Article/CJFDTotal-DZXW201003010.htm |
long_lat |
ENVELOPE(76.111,76.111,-69.427,-69.427) ENVELOPE(76.104,76.104,-69.426,-69.426) ENVELOPE(75.696,75.696,-69.532,-69.532) ENVELOPE(76.217,76.217,-69.400,-69.400) ENVELOPE(76.099,76.099,-69.429,-69.429) ENVELOPE(76.101,76.101,-69.424,-69.424) |
geographic |
Antarctic Blundell Blundell Peak Bolingen Islands East Antarctica Larsemann Hills Stornes Stornes Peninsula The Antarctic |
geographic_facet |
Antarctic Blundell Blundell Peak Bolingen Islands East Antarctica Larsemann Hills Stornes Stornes Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_relation |
Huang, F., Li, G., Liu, X., Kong, P., Ju, Y., Fink, D., Fang, A., & Yu, L. (2010). Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica. Acta Geologica Sinica-English Edition, 84(3), 543-548. 1000-9515 http://www.cnki.com.cn/Article/CJFDTotal-DZXW201003010.htm http://apo.ansto.gov.au/dspace/handle/10238/1964 |
_version_ |
1766076308628963328 |