Terrestrial cosmogenic surface exposure dating of glacial and associated landforms in the Ruby Mountains-East Humboldt Range of central Nevada and along the northeastern flank of the Sierra Nevada

Wesnousky, Steven G.; Briggs, Richard W.; Caffee, Marc W.; Ryerson, F. J.; Finkel, Robert C.; Owen, Lewis A.

doi:10.1016/j.geomorph.2016.04.027

Title: Terrestrial cosmogenic surface exposure dating of glacial and associated landforms in the Ruby Mountains-East Humboldt Range of central Nevada and along the northeastern flank of the Sierra Nevada

Journal Article · Sat May 07 00:00:00 EDT 2016 · Geomorphology

DOI:https://doi.org/10.1016/j.geomorph.2016.04.027· OSTI ID:1438659

Wesnousky, Steven G. ^[1]; Briggs, Richard W. ^[2]; Caffee, Marc W. ^[3];

^[4]; Finkel, Robert C. ^[4]; Owen, Lewis A. ^[5]

Univ. of Nevada, Reno, NV (United States). Center for Neotectonic Studies
United States Geological Survey, Golden, CO (United States)
Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Inst. of Geophysics and Planetary Physics
Univ. of Cincinnati, OH (United States)

Deposits near Lamoille in the Ruby Mountains-East Humboldt Range of central Nevada and at Woodfords on the eastern edge of the Sierra Nevada each record two distinct glacial advances. In this paper, we compare independent assessments of terrestrial cosmogenic nuclide (TCN) surface exposure ages for glacial deposits that we have determined to those obtained by others at the two sites. At each site, TCN ages of boulders on moraines of the younger advance are between 15 and 30 ka and may be associated with marine oxygen isotope stage (MIS) 2. At Woodfords, TCN ages of boulders on the moraine of the older advance are younger than ~ 60 ka and possibly formed during MIS 4, whereas boulders on the correlative outwash surface show ages approaching 140 ka (~ MIS 6). The TCN ages of boulders on older glacial moraine at Woodfords thus appear to severely underestimate the true age of the glacial advance responsible for the deposit. The same is possibly true at Lamoille where clasts sampled from the moraine of the oldest advance have ages ranging between 20 and 40 ka with a single outlier age of ~ 80 ka. The underestimations are attributed to the degradation and denudation of older moraine crests. Noting that boulder ages on the older advances at each site overlap significantly with MIS 2. Finally, we speculate that erosion of the older moraines has been episodic, with a pulse of denudation accompanying the inception of MIS 2 glaciation.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); United States Geological Survey, Golden, CO (United States)

Sponsoring Organization:: USDOE; United States Geological Survey (USGS)

Grant/Contract Number:: AC52-07NA27344; G15AP00088; G14AP00048

OSTI ID:: 1438659

Report Number(s):: UCRL-JRNL-218878

Journal Information:: Geomorphology, Vol. 268; ISSN 0169-555X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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58 GEOSCIENCES
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Title: Terrestrial cosmogenic surface exposure dating of glacial and associated landforms in the Ruby Mountains-East Humboldt Range of central Nevada and along the northeastern flank of the Sierra Nevada

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