Arrhenius activation energy and transitivity in fission-track annealing equations

Fission-track annealing models aim to extrapolate laboratory kinetics the geological timescale for application studies. Model trends empirically capture mechanisms of track length reduction. To facilitate interpretation fission-track trends, a formalism, based on quantities already in use study physicochemical processes, is developed and allows calculation rate constants, Arrhenius activation energies, transitivity functions models. These are then obtained parallel Arrhenius, curvilinear, fanning curvilinear models, fitted with Durango apatite data. Parallel showed be consistent single energy mechanism reaction-order model order ≈ − 4. However, one that results better fits data predictions agreement evidence. Fanning seem describe more complex picture, concurrent recombination presenting energies varying time temperature, seems not most appropriate. It apparent from analysis dominant described by classical (not quantum) barrier transitions.