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

Abstract : Chemistry of apatite crystals which represent,s a key factor in fission-track annealing kinetics 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 organic matter maturation expressed by Tmax values has been established after 3 to 30 days durati~n experiments and appears as a straight line evolving with time.Apatite fission-track thermochronology has been used on the south-eastern border of the French Massif Central. The results are, 25-209 Ma FT ages and 10.5-13.7 horizontal confined tracks lengths; the lengths show a negative skew with sorne short tracks. Thermal history reconstruction proposes: 1) an uplift from South to North which was initiated at the. end of Jurassic or beginning of Cretaceous foUowed by an intense erosion in middle Cretaceous; 2) a short delay in upper Cretaceous and 3) an important erosion from Tertiary-time which has affected mainly the border along a direction paraUel to the Cévennes fauIt.
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Jocelyn Barbarand. Cinétique de cicatrisation des traces de fission dans les cristaux d'apatite et histoire thermique de la bordure sud-est du Massif Central. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10052⟩. ⟨tel-01747558⟩



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