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GEOREF RECORD

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

Joseph M. Licciardi, Peter U. Clark, Edward J. Brook, Kenneth L. Pierce, Mark D. Kurz, David Elmore and Pankaj Sharma
Cosmogenic (super 3) He and (super 10) Be chronologies of the late Pinedale northern Yellowstone ice cap, Montana, USA
Geology (Boulder) (December 2001) 29 (12): 1095-1098

Abstract

Cosmogenic (super 3) He and (super 10) Be 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 + or - 0.4 (super 3) He ka and 16.2 + or - 0.3 (super 10) Be ka, respectively. Concordance of these ages supports the scaled production rates used for (super 3) He (118.6 + or - 6.6 atoms.g (super -1) . yr (super -1) ) and (super 10) Be (5.1 + or - 0.3 atoms.g (super -1) .yr (super -1) ) (+ or -2sigma ; at high latitudes at sea level). Two recessional moraines upvalley from the terminal moraine have mean ages of 15.7 + or - 0.5 (super 10) Be ka and 14.0 + or - 0.4 (super 10) Be ka, respectively, and a late-glacial flood bar was deposited at 13.7 + or - 0.5 (super 10) Be 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 approximately 14 (super 10) Be ka.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 29
Serial Issue: 12
Title: Cosmogenic (super 3) He and (super 10) Be chronologies of the late Pinedale northern Yellowstone ice cap, Montana, USA
Affiliation: Oregon State University, Department of Geosciences, Corvallis, OR, United States
Pages: 1095-1098
Published: 200112
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 2001-075877
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2001127; Woods Hole Oceanogr. Inst., Contrib. No. 10490
Illustration Description: illus. incl. sketch maps
N45°00'00" - N45°23'60", W111°00'00" - W110°40'00"
Secondary Affiliation: Washington State University, USA, United StatesU. S. Geological Survey, USA, United StatesWoods Hole Oceanographic Institution, USA, United StatesPurdue University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200124
Program Name: USGSOPNon-USGS publications with USGS authors
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