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Luminescence chronology of late Pleistocene loess-paleosol and tephra sequences near Fairbanks, Alaska

Published online by Cambridge University Press:  20 January 2017

Glenn W. Berger
Glenn W. Berger*
Affiliation:
Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512-1095, USA
*
* Fax: +1-775-673-7397. E-mail address: gwberger@dri.edu
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Abstract

Thermoluminescence (TL) and infrared-stimulated luminescence (IRSL) sediment-dating methods have been applied to paleosol- and tephra-bearing loess sequences younger than marine oxygen isotope stage (MIS) 7 at three important sites. TL ages indicate the development of significant paleosols ∼75,000 and ∼30,000 yr ago in the loess sequence at the Gold Hill site. Relatively minor soil development occurred ∼70,000 and ∼48,000 yr ago. Like the ∼75,000-yr-old soil, the 30,000-yr-old soil is apparently of global extent, and consistent in timing with inferred warm intervals elsewhere (e.g., Greenland, Europe, western and central China). At Birch Hill, replicate TL dating of primary loess combined with two earlier TL results from the same site, and with an earlier mean fission-track-glass-shard age of 140,000 ± 10,000 yr for the associated Old Crow tephra, yield a more precise numeric age of 142,300 ± 6600 yr for this Alaska/Yukon chronostratigraphic marker ash bed. Three of the TL ages at the Halfway House site are difficult to interpret, but combined with other evidence, they indicate: (1) the upper 5–6 m of loess from Halfway House is not part of the Gold Hill Loess (equivalent to pre-MIS 5 age) as long thought by T.L. Péwé, but rather is much younger; (2) the regionally significant variegated tephra, found in the Fairbanks and Klondike areas and previously thought to be older than MIS 5, has an age of 77,800 ± 4100 yr (late MIS 5).

Keywords

Luminescence datingLoessAlaskaLoess-paleosolTephraLate Pleistocene
Type
Research Article
Information
Quaternary Research , Volume 60 , Issue 1 , July 2003 , pp. 70 - 83
Copyright
University of Washington

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