Estimation of the Terrestrial Age of Antarctic Ordinary Chondrites Using Fusion Crust

Details Estimation of the Terrestrial Age of Antarctic Ordinary Chondrites Using Fusion Crust Estimation of the Terrestrial Age of Antarctic Ordinary Chondrites Using Fusion Crust

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..281c&link_type=abstract

Lunar and Planetary Science, volume 27, page 281

Computer Science

Age: Terrestrial, Chondrites: Ordinary, Fusion Crust, Meteorites: Antarctic, Thermoluminescence

Scientific paper

The large number of meteorites found in the Antarctic permits the study of mechanisms that concentrate the meteorites and the possible changes in the meteorite population over the last million years. The terrestrial ages of individual meteorites are important data for these studies. Miono et al. have shown that a correlation exists between terrestrial ages calculated using the natural thermoluminescence (TL) of the extreme outer layer of a meteorite (about 1mm from the fusion crust) and those determined from the cosmogenic radionuclides ^14C and ^36Cl. Natural TL within the first mm of the fusion crust is completely drained during atmospheric passage2 and re-accumulates while on the earth due to exposure to internal and external radiation. Miono et al. found that the older meteorites did not seem to correlate as well with cosmogenic radionuclides derived terrestrial ages as the younger ones and he attributed this to an error in the measurement of terrestrial ages using ^36Cl. However, Miono et al. assumed a linear build up of natural TL. If we account for the nonlinearity of natural TL build up due to thermal decay, there is a better correspondence between natural TL and 36Cl derived ages in excess of about 100 ka. The natural TL of the fusion crust allows the estimation of terrestrial ages even for very small meteorites.

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