Minimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarctica

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dc.contributor.authorHuang, FXen_AU
dc.contributor.authorLi, GWen_AU
dc.contributor.authorLiu, XHen_AU
dc.contributor.authorKong, Pen_AU
dc.contributor.authorJu, YTen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorFang, AMen_AU
dc.contributor.authorYu, LJen_AU
dc.date.accessioned2010-07-30T05:12:11Zen_AU
dc.date.available2010-07-30T05:12:11Zen_AU
dc.date.issued2010-06-01en_AU
dc.date.statistics2010-06-01en_AU
dc.description.abstractConsiderable 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.en_AU
dc.identifier.citationHuang, 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. doi:10.1111/j.1755-6724.2010.00271.xen_AU
dc.identifier.govdoc2085en_AU
dc.identifier.issn1000-9515en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleActa Geologica Sinica - English Editionen_AU
dc.identifier.pagination543-548en_AU
dc.identifier.urihttps://doi.org/10.1111/j.1755-6724.2010.00271.xen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1964en_AU
dc.identifier.volume84en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectAntarcticaen_AU
dc.subjectBeryllium 10en_AU
dc.subjectErosionen_AU
dc.subjectEnvironmental exposureen_AU
dc.subjectAge estimationen_AU
dc.subjectGlaciersen_AU
dc.titleMinimum bedrock exposure ages and their implications: Larsemann Hills and neighboring Bolingen Islands, East Antarcticaen_AU
dc.typeJournal Articleen_AU
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