Age-erosion constraints on an Early Pleistocene paleosol in Yukon, Canada, with profiles of 10Be and 26Al: Evidence for a significant loess cover effect on cosmogenic nuclide production rates

Hidy, Alan J.; Gosse, John C.; Sanborn, Paul; Froese, Duane G.

doi:10.1016/j.catena.2018.02.009

Title: Age-erosion constraints on an Early Pleistocene paleosol in Yukon, Canada, with profiles of ¹⁰Be and ²⁶Al: Evidence for a significant loess cover effect on cosmogenic nuclide production rates

Journal Article · 16 February 2018 · Catena

DOI: https://doi.org/10.1016/j.catena.2018.02.009 · OSTI ID:1424118

Hidy, Alan J. ^[1]; Gosse, John C. ^[2]; Sanborn, Paul ^[3]; Froese, Duane G. ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry; Dalhousie University, Halifax, Nova Scotia (Canada)
Dalhousie University, Halifax, Nova Scotia (Canada)
University of Northern British Columbia, Prince George, British Columbia (Canada)
University of Alberta, Edmonton, Alberta (Canada). Department of Earth and Atmospheric Sciences

We report that Wounded Moose type paleosols developed on remnant deposits of Late Pliocene to Early Pleistocene [pre-Reid] Cordilleran Ice Sheet [CIS] glaciations in central Yukon, Canada. It is an important regional soil-geomorphic marker at the boundary between early CIS advances and the non-glaciated regions of Yukon and Alaska. Yet, at present, its age is poorly constrained between the Reid [0.2 Ma] and earliest [2.84 Ma] CIS advances. Here, we apply depth profiles of in situ-produced cosmogenic ²⁶Al and ¹⁰Be to obtain both a minimum exposure age [1.12^+0.44/_-0.36 Ma, 2σ] and maximum erosion rate [1.1^+0.9/_-0.5 m Myr^-1] for the Wounded Moose paleosol. Here, our results show that this soil formed under exceptionally stable conditions [max erosion rate similar to polar bedrock erosion rates] and that it pre-dates the emergence of the 100 ka [eccentricity] climate cycle. Contrasting our results from single- and joint-nuclide depth profile models reveals a significant discrepancy between calculated and effective ¹⁰Be and ²⁶Al production rates [40–65% of expected values]. We interpret this discrepancy as the result of intermittent loess cover—with a time-averaged depth between 60 and 110 cm—which significantly reduced apparent exposure ages obtained from the single–nuclide model. The observation of such a significant loess-cover effect on cosmogenic nuclide production has implications for exposure dating in glacial and periglacial environments; a multi-nuclide sampling strategy is required to quantify this effect.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1424118

Report Number(s):: LLNL-JRNL-735086

Journal Information:: Catena, Vol. 165, Issue C; ISSN 0341-8162

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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54 ENVIRONMENTAL SCIENCES
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Title: Age-erosion constraints on an Early Pleistocene paleosol in Yukon, Canada, with profiles of 10Be and 26Al: Evidence for a significant loess cover effect on cosmogenic nuclide production rates

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Title: Age-erosion constraints on an Early Pleistocene paleosol in Yukon, Canada, with profiles of ¹⁰Be and ²⁶Al: Evidence for a significant loess cover effect on cosmogenic nuclide production rates