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