Cosmogenic 3He and 10Be chronologies of the late Pinedale northern Yellowstone ice cap, Montana, USA

Geology
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Abstract

Cosmogenic 3He and 10Be ages measured on surface boulders from the moraine sequence deposited by the northern outlet glacier of the Yellowstone ice cap indicate that the outlet glacier reached its terminal position at 16.5 ± 0.4 3He ka and 16.2 ± 0.3 10Be ka, respectively. Concordance of these ages supports the scaled production rates used for 3He (118.6 ± 6.6 atoms · g−1 · yr−1) and 10Be (5.1 ± 0.3 atoms · g−1 · yr−1) (±2σ at high latitudes at sea level). Two recessional moraines upvalley from the terminal moraine have mean ages of 15.7 ± 0.5 10Be ka and 14.0 ± 0.4 10Be ka, respectively, and a late-glacial flood bar was deposited at 13.7 ± 0.5 10Be ka. These cosmogenic chronologies identify a late Pinedale glacial maximum in northern Yellowstone that is significantly younger than previously thought, and they suggest deglaciation of the Yellowstone plateau by ∼14 10Be ka.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Cosmogenic 3He and 10Be chronologies of the late Pinedale northern Yellowstone ice cap, Montana, USA
Series title Geology
DOI 10.1130/0091-7613(2001)029<1095:CHABCO>2.0.CO;2
Volume 29
Issue 12
Year Published 2001
Language English
Publisher GSA
Contributing office(s) Northern Rocky Mountain Science Center
Description 4 p.
First page 1095
Last page 1098
Country United States
State Montana
Other Geospatial Yellowstone ice cap
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