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Beryllium-10 dating of the duration and retreat of the last Pinedale glacial sequence

Authors :
Gosse, J.C.
Klein, J.
Evenson, E.B.
Lawn, B.
Middleton, R.
Source :
Science. June 2, 1995, Vol. 268 Issue 5215, p1329, 5 p.
Publication Year :
1995

Abstract

Accurate terrestrial glacial chronologies are needed for comparison with the marine record to establish the dynamics of global climate change during transitions from glacial to interglacial regimes. Cosmogenic beryllium-10 measurements in the Wind River Range indicate that the last glacial maximum (marine oxygen isotope stage 2) was achieved there by 21,700 [+ or - ] 700 beryllium-10 years and lasted 5900 years. Ages of a sequence of recessional moraines and striated bedrock surfaces show that the initial deglaciation was rapid and that the entire glacial system retreated 33 kilometers to the cirque basin by 12,100 ± 500 beryllium-10 years.<br />Alpine glacial systems are more responsive than large continental ice sheets to changes in temperature and precipitation. Chronologies of alpine morainal sequences therefore offer the possibility of providing records of [...]

Details

Language :
English
ISSN :
00368075
Volume :
268
Issue :
5215
Database :
Gale General OneFile
Journal :
Science
Publication Type :
Academic Journal
Accession number :
edsgcl.17083772