Cosmogenic 26Al/10Be surface production ratio in Greenland
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
The assumed value for the cosmogenic 26Al/10Be surface production rate ratio in quartz is an important parameter for studies investigating the burial or subaerial erosion of long-lived surfaces and sediments. Recent models and data suggest that the production ratio is spatially variable and may be greater than originally thought. Here we present measured 26Al/10Be ratios for 24 continuously exposed bedrock and boulder surfaces spanning ~61–77°N in Greenland. Empirical measurements, such as ours, include nuclides produced predominately by neutron-induced spallation with percent-level contributions by muon interactions. The slope of a York regression line fit to our data is 7.3 ± 0.3 (1σ), suggesting that the 26Al/10Be surface production ratio exceeds the commonly used value of 6.75, at least in the Arctic. A higher 26Al/10Be production ratio has implications for multinuclide cosmogenic isotope studies because it results in greater modeled burial durations and erosion rates.
Date Issued
2017-02-02
Date Acceptance
2017-01-12
Citation
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (3), pp.1350-1359
ISSN
0094-8276
Publisher
American Geophysical Union
Start Page
1350
End Page
1359
Journal / Book Title
GEOPHYSICAL RESEARCH LETTERS
Volume
44
Issue
3
Copyright Statement
© 2017 American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Corbett, L. B., P. R. Bierman, D. H. Rood, M. W. Caffee, N. A. Lifton, and T. E. Woodruff (2017), Cosmogenic 26Al/10Be surface production ratio in Greenland, Geophys. Res. Lett., 44, 1350–1359, doi:10.1002/2016GL071276. To view the published open abstract, go to https://dx.doi.org/10.1002/2016GL071276
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000396115000020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
BE-10 PRODUCTION-RATE
PRODUCTION-RATE CALIBRATION
NUCLIDE PRODUCTION-RATES
LAST GLACIAL MAXIMUM
IN-SITU
ICE-SHEET
WESTERN GREENLAND
NORTHWEST GREENLAND
EROSION RATES
ARCTIC CANADA
Meteorology & Atmospheric Sciences
MD Multidisciplinary
Publication Status
Published