FUSION CRUST AND THE MEASUREMENT OF SURFACE AGES OF ANTARCTIC ORDINARY
Miono et al. generated a reasonable agreement between terrestrial ages calculated using the thermoluminescence (TL) of fusion crust and those calculated from the abundance of cosmogenic nuclides1. In a previous paper it was shown that this relationship could be improved if the ages were calculated u...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.610.4830 http://www.uark.edu/depts/cosmo/publications/pub by year/1997 papers/akridge et al 1997b.pdf |
| Summary: | Miono et al. generated a reasonable agreement between terrestrial ages calculated using the thermoluminescence (TL) of fusion crust and those calculated from the abundance of cosmogenic nuclides1. In a previous paper 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 up2. 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. His data were also consistent with meteorite temperatures on the order of 0 0C. 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- 150C. This temperature range limits the use of fusion crust to those meteorites with surface ages < 20 ka. |
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