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Fast-growing till over ancient ice in Beacon Valley, Antarctica

Felix Ng, Bernard Hallet, Ronald S. Sletten and John O. Stone
Fast-growing till over ancient ice in Beacon Valley, Antarctica
Geology (Boulder) (February 2005) 33 (2): 121-124


We analyze published cosmogenic (super 3) He depth profiles through the till that covers relict glacier ice in Beacon Valley, Antarctica, in order to derive rigorous constraints on the till thickness history, and on the amount and rate of ice loss by sublimation. The till is a residue of debris-laden ice that sublimed. The (super 3) He profiles show that the lower 80% of the till formed in the past 310-43 k.y. under sublimation rates averaging >7 m.m.y. (super -1) (meters per million years). Such rapid recent growth of the till contradicts previous interpretations that it is older than 8.1 Ma at an adjacent site, where it encloses volcanic ash of this age. We question whether the ash provides a valid age constraint for the ice. Cosmogenic nuclide analysis of the till where the ash was collected for dating should resolve this question.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 33
Serial Issue: 2
Title: Fast-growing till over ancient ice in Beacon Valley, Antarctica
Affiliation: Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States
Pages: 121-124
Published: 200502
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 16
Accession Number: 2005-016752
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S78°30'00" - S77°00'00", E159°00'00" - E165°00'00"
Secondary Affiliation: University of Washington, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200507
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