The natural thermoluminescence of meteorites. V - Ordinary chondrites at the Allan Hills ice fields

Details The natural thermoluminescence of meteorites. V - Ordinary chondrites at the Allan Hills ice fields The natural thermoluminescence of meteorites. V - Ordinary chondrites at the Allan Hills ice fields

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1875b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B2, p. 1875-1888.

Physics

6

Antarctic Regions, Chondrites, Thermoluminescence, Land Ice, Meteoroid Concentration, Meteorites, Stony Meteorites, Chondrites, Antarctic Meteorites, Catalog, Ordinary Chondrites, Alh Meteorites, Thermoluminescence, Thermal History, Samples, Meteorite, Pairing, Terrestrial Age, Laboratory Studies, H Chondrites, L Chondrites, Ll Chondrites, Transport, Concentration, Comparisons

Scientific paper

Natural thermoluminescence (TL) data have been obtained for 167 ordinary chondrites from the ice fields in the vicinity of the Allan Hills in Victoria Land, Antarctica, in order to investigate their thermal and radiation history, pairing, terrestrial age, and concentration mechanisms. Natural TL values for meteorites from the Main ice field are fairly low, while the Farwestern field shows a spread with many values 30-80 krad, suggestive of less than 150-ka terrestrial ages. There appear to be trends in TL levels within individual ice fields which are suggestive of directions of ice movement at these sites during the period of meteorite concentration. These directions seem to be confirmed by the orientations of elongation preserved in meteorite pairing groups. The proportion of meteorites with very low natural TL levels at each field is comparable to that observed at the Lewis Cliff site and for modern non-Antarctic falls and is also similar to the fraction of small perihelia orbits calculated from fireball and fall observations. Induced TL data for meteorites from the Allan Hills confirm trends which show that a select group of H chondrites from the Antarctic experienced a different extraterrestrial thermal history to that of non-Antarctic H chondrites.

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