Two apatite samples from the Xanthi pluton (Northern Greece) have been dated by the fission track (FT) method; their confined track lengths were also measured. The FT ages (25.5+ or -1.2 Ma and 26.0+ or -1.8 Ma respectively, corresponding to a closure temperature of about 100 degrees C) are just few million years lower than biotite ages obtained using either K-Ar or Rb-Sr method, which correspond to higher closure temperatures. However, the confined track length distributions (mean length 13.0 mu m, standard deviation 2.0 mu m and skewness -0.84 and -0.50 respectively) indicate that the samples resided for a long time in the partial annealing zone (temperatures between approximately 60 degrees C and approximately 120 degrees C). Apatite FT analysis suggests a simple thermal history: after an early fast cooling, the pluton cooled very slowly. The samples reached low temperatures (<60 degrees C) in Pliocene-Pleistocene times. Fission track analysis did not detect any relevant tectonic phase in the Xanthi pluton after its emplacement.

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