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
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.