Cinétique de cicatrisation des traces de fission dans les cristaux d'apatite et histoire thermique de la bordure sud-est du Massif Central

TL;DRAbstract

Chemistry of apatite crystals which represent,s a key factor in fission-track annealingkinetics has been investigated by cathodoluminescence, electron and ion microprobes for various samples. Cathodoluminescence (CL) appeqrs as a deciding tool to reveal crystals zonations and to test grains population homogeneity. Samples with different fission-track ages populations reveal various grains color populations. CL spectrometry gives moreover semiquantitative data about Gd3+,Ce3+, Df+ and Sm3+ with a very low detection limit. Relationship between fission-track annealing kinetics and apatite crystals chemistry is not univocal. Annealing experiments display that several fadors play a major role on track stability : ClIF ratio, light rare earth elements contents or crystals substitution degree which is expressed by CaO and P20S contents. Natural annealed samples show however that these controIs vary and could be in contradiction between samples. 'A link between fission-track annealing and orga

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