Abstract
The name Apatite represents a large family of minerals with general formula Me10 (XO4)6 Y2. Natural apatites are rarely pure and numerous substitutions are encountered on the cation site Me, on the tetrahedra sites (X04) and on the anion site Y.
Laboratory isothermal annealing experiments have been performed on thermal neutron induced fission tracks of uranium in apatites of different compositions.
Our data suggest that heavily substituted apatites on the cation site are less resistant to thermal fading of fission tracks than pure phospho-calcic apatites, and confirm that Cl-apatites are more resistant to thermal annealing than F-apatites, as pointed out by Green et al. (1986). Our important finding is that we observe an inverse correlation between the number of substitutions on both cation and anion sites. This may imply that instead of the Cl/F-ratio, the number of substitutions on the cation site is directly responsible for the different thermal stabilities of fission tracks in different apatites.
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Carpéna, J. (1998). Uranium-235 Fission Track Annealing in Minerals of the Apatite Group: An Experimental Study. In: van den Haute, P., de Corte, F. (eds) Advances in Fission-Track Geochronology. Solid Earth Sciences Library, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9133-1_6
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DOI: https://doi.org/10.1007/978-94-015-9133-1_6
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