Evidence for differences in the thermal histories of Antarctic and non-Antarctic H chondrites with cosmic-ray exposure ages less than 20 MA

Details Evidence for differences in the thermal histories of Antarctic and non-Antarctic H chondrites with cosmic-ray exposure ages less than 20 MA Evidence for differences in the thermal histories of Antarctic and non-Antarctic H chondrites with cosmic-ray exposure ages less than 20 MA

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1193s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, April 1991, p. 1193-1197.

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Antarctic Regions, Chondrites, Cosmic Rays, Thermoluminescence, Annealing, Gas Analysis, Meteorites, Antarctic Meteorites, Thermal History, H Chondrites, Age, Chondrites, Stony Meteorites, Exposure Age, Cosmic Rays, Comparisons, Thermoluminescence, Rare Gases, Weathering, Annealing, Temperature, Samples, Meteorite, Laboratory Studies, Shock Effects, Kernouve, Fragmentation, Pairing, H6 Chondrites, Alh Meteorites, Alha76008

Scientific paper

Antarctic H chondrites show a different range of induced thermoluminescence properties compared with those of H chondrites that have fallen elsewhere in the world. Recent noble gas data of Schultz et al. (1991) show that this difference is displayed most dramatically by meteorites with cosmic-ray exposure ages less than 20 Ma, and they confirm that the differences cannot be attributed to weathering or to the presence of a great many fragments of an unusual Antarctic meteorite. Annealing experiments on an H5 chondrite, and other measurements on a variety of ordinary chondrites, have shown that induced TL properties are sensitive to the thermal histories of the meteorities. It is concluded that the events(s) that released the less than 20 Ma samples, which are predominantly those with exposure ages of 8 + or - 2 Ma, produced two groups with different thermal histories, one that came to earth several 100,000 years ago and that are currently only found in Antarctica, and one that is currently falling on the earth.

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