期刊
QUATERNARY SCIENCE REVIEWS
卷 141, 期 -, 页码 85-93出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2016.04.006
关键词
Cirque; Quaternary; Ireland; Last Glacial Maximum; Paleoclimatology; Cosmogenic nuclide
资金
- US NSF Global Change Program [EAR 1304909]
- NSF [EAR-1153689]
- Directorate For Geosciences
- Division Of Earth Sciences [1560658, 1304909] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1153689] Funding Source: National Science Foundation
Reconstructions of the extent and height of the Irish Ice Sheet (IIS) during the Last Glacial Maximum (LGM, similar to 19-26 ka) are widely debated, in large part due to limited age constraints on former ice margins and due to uncertainties in the origin of the trimlines. A key area is southwestern Ireland, where various LGM reconstructions range from complete coverage by a contiguous IIS that extends to the continental shelf edge to a separate, more restricted southern-sourced Kerry-Cork Ice Cap (KCIC). We present new Be-10 surface exposure ages from two moraines in a cirque basin in the Macgillycuddy's Reeks that provide a unique and unequivocal constraint on ice thickness for this region. Nine Be-10 ages from an outer moraine yield a mean age of 24.5 +/- 1.41 ka while six ages from an inner moraine yield a mean age of 20.4 +/- 1.2 ka. These ages show that the northern flanks of the Macgillycuddy's Reeks were not covered by the IIS or a KCIC since at least 24.5 +/- 1.4 ka. If there was more extensive ice coverage over the Macgillycuddy's Reeks during the LGM, it occurred prior to our oldest ages. (C) 2016 Elsevier Ltd. All rights reserved.
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