Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.3317m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. E2, p. 3317-3333
Physics
16
Antarctic Regions, Chemical Composition, Chondrites, Radioactive Age Determination, Trace Elements, Chlorine, Geochronology, Half Life, Mass Spectroscopy, Multivariate Statistical Analysis, Temperature Effects, Variations
Scientific paper
We report Cl-36 (301-kyr half-life) data obtained by accelerator mass spectrometry allowing nominal terrestrial ages to be determined for 39 Antarctic H4-6 chondrites for which contents of volatile trace elements are known. The compositional difference between these Antarctic meteorites and 58 non-Antarctic falls increases with terrestrial age and, using multivariate statistical techniques, becomes highly significant for Antarctic samples with ages greater than 50 kyr. The compositional difference is inconsistent with trivial causes such as weathering and seems to reflect differences in thermal histories of parent sources. Temporal source variations for the H chondrite flux on Earth thus exist not only on a short-term, 40 years, basis (Dodd et al., 1993) but also on a long-term, greater than 50 kyr, basis.
Elmore David
Lipschutz Michael E.
Michlovich Edward Steven
Vogt Stephan
Wang Ming-Sheng
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