Mathematics – Logic
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2269t&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Aug. 1991, p. 2269-2283.
Mathematics
Logic
37
Aluminum 26, Antarctic Regions, Beryllium 10, Chronology, Cosmic Rays, Glacial Drift, Earth Atmosphere, Mass Spectrometers, Radiation Effects
Scientific paper
Surface exposure ages of Antarctic moraines were examined using isotope analysis data on in situ produced Be-10 and Al-26 from quartz samples of sandstone boulders from several moraines in Arena Valley. Data obtained for Be-10 and Al-26 at 1300 m and 87-deg S correspond to sea-level production rates at high geomagnetic latitude of 6.4 at./g per yr and 41.7 at./g per yr for Be-10 and Al-26, respectively. These results are consistent with determinations based on about 11 Ky glacially polished surfaces in the Sierra Nevada in California, and imply exposure ages for the various moraines ranging from 50 Ky to 2.5 My, in accordance with other geological evidence.
Brook Edward J.
Brown Erik Thorson
Edmond John M.
Kurz Mark D.
Raisbeck Grant M.
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