Reheated Ordinary Chondrites: The Record of Small Perihelia and Impacts Over the Last Million Years

Details Reheated Ordinary Chondrites: The Record of Small Perihelia and Impacts Over the Last Million Years Reheated Ordinary Chondrites: The Record of Small Perihelia and Impacts Over the Last Million Years

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...97b&link_type=abstract

Lunar and Planetary Science, volume 27, page 97

Physics

Age: Terrestrial, Chondrites: Ordinary, Cosmogenic Noble Gases, Meteorites: Reheated, Thermoluminescence

Scientific paper

"Reheated" meteorites, i.e. meteorites that have experienced some significant degree of heating after metamorphism often within the last 100 million years or so, are fairly common among ordinary chondrites and basaltic meteorites. Heating is inferred to be by impact or by close passage to the Sun. Here I use the ratios of cosmogenic helium and neon and the natural thermoluminescence (TL) of individual meteorites to examine the timing and nature of reheating of ordinary chondrites. The noble gases can reflect reheating at any time over the entire cosmic ray exposure age (typically millions of years), while natural TL reflects reheating events within the last hundred thousand years. Natural TL can reflect thermal events of smaller magnitude than can the noble gases. About 40% of H and L modern falls have been reheated to some extent over their cosmic ray exposure history, but only about 25% of LL chondrites have apparently been reheated. The TL data indicate that, while about 20% of H chondrites have been reheated within the last 100,000 years, only about 12% of L and LL chondrites have experienced recent reheating. Data for Antarctic meteorites suggest that reheated meteorites were less common or even absent >200,000 years ago.

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