Fusion crust and the measurement of surface ages of Antarctic ordinary chondrites

Details Fusion crust and the measurement of surface ages of Antarctic ordinary chondrites Fusion crust and the measurement of surface ages of Antarctic ordinary chondrites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28...15a&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. .15.

Computer Science

Antarctic Regions, Earth Crust, Chondrites, Thermoluminescence, Meteoritic Composition, Fusion, Nuclides, Geochronology, Surface Temperature

Scientific paper

Miono et al. (1995) generated a reasonable agreement between terrestrial ages calculated using the thermoluminescence (TL) of fusion crust and those calculated from the abundance of cosmogenic nuclides. In Cunningham et al. (1996) it was shown that this relationship could be improved if the ages were calculated using an equation that accounted for the decay of natural TL as well as build up. With these corrections Miono et al.'s data seem to suggest that the natural TL of the fusion crust would be useful in determining the terrestrial ages of meteorites between 40 and 200 ka. Their data were also consistent with meteorite temperatures on the order of 0 C. The equivalent doses exhibited by a suite of Antarctic meteorites, studied in our laboratory, seem to suggest that the surface of the meteorites reached temperatures on the order of 10-15 C. This temperature range limits the use of fusion crust to those meteorites with surface ages less than 20 ka.

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