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Title: Single-grain OSL dating of glaciofluvial quartz constrains Reid glaciation in NW Canada to MIS 6
Authors: Demuro, Martina
Froese, Duane Gerald
Arnold, Lee J.
Roberts, Richard G.
Keywords: Reid glaciation;OSL dating;Single-grain;Glacial deposits;Cordilleran Ice Sheet;Beringia;Ash Bend
Issue Date: Mar-2012
Publisher: Cambridge University Press
Citation: Quaternary Research, 2012, 77 (2), 305-316
Abstract: Improved chronological control on the penultimate advance of the Cordilleran Ice Sheet in northwest Canada (the Reid glaciation) is required for a better understanding of late Quaternary palaeoclimatic and palaeoenvironmental change in eastern Beringia. However, reliable dating of glaciation events beyond the last glacial maximum is commonly hindered by a lack of directly dateable material. In this study we (i) provide the first combined minimum and maximum age constraint on the Reid glaciation at Ash Bend, its reference locale in the Stewart River valley, northwestern Canadian Cordillera, using single-grain optically stimulated luminescence dating of quartz; and (ii) compare the timing of the Reid glaciation with other penultimate ice sheet advances in the region with the aim of establishing improved glacial reconstructions in eastern Beringia. We obtain ages of 158 ± 18 ka and 132 ± 18 ka for glaciofluvial sands overlying and underlying the Reid till, respectively. These ages indicate that the Reid advance, at its reference locale, occurred during MIS 6. This precludes an earlier MIS 8 age, and suggests that the Reid advance may have been synchronous with the Delta glaciation of central Alaska, and is likely correlative with the Mirror Creek glaciation in southern Yukon.
ISSN: 0033-5894
DOI: 10.1016/j.yqres.2011.11.009
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Type: Article
Appears in Collections:Geocronología y Geología

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