Abstract
We report data from two new zircon annealing experiments in which spontaneous fission tracks are heated at 398°C and 498°C for 10000 hours. These supplement 29 previous experiments conducted on the same zircon. We fit fanning and parallel Arrhenius models to the 31 experiments using a recently developed modelling procedure, which provides efficient estimates of the kinetic parameters and their precisions. For both fanning and parallel models the fitted mean lengths agree well with the observed ones, although formal statistical tests suggest that the fanning model is a better representation of the data. We discuss the validity of extrapolations of these models to geological time scales, and make comparisons with various geological constraints, including ultra-deep borehole data and fossil partial annealing zones. The model extrapolations are consistent with these constraints, suggesting that the revised kinetics work well, within the limitations of current knowledge. This supports the future use of the zircon fission track system for geological thermal history analysis.
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Tagami, T., Galbraith, R.F., Yamada, R., Laslett, G.M. (1998). Revised Annealing Kinetics of Fission Tracks in Zircon and Geological Implications. 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_8
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DOI: https://doi.org/10.1007/978-94-015-9133-1_8
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