Abstract
A reassessment of the time scales of heating responsible for fission-track annealing of apatites from deep drill cores suggests that these estimates may be as much as an order of magnitude too high. As these earlier results form the basis for interpreting the thermal significance of apatite fission-track ages from geological settings, a reinterpretation of the heating durations requires that the annealing kinetics also be revised. Support for this new model is obtained from a recent reanalysis of laboratory annealing data.
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