Fission track dating and thermal history of some volcanic and plutonic complex rocks from Turkey and France

Two sets of natural samples of known ages and different geological history have been investigated using the fission track dating method. The corresponding thermal history is studied by extracting: (1) apatite from three lavas samples belonging to the Tertiary Bodrum volcanic complex in Turkey; (2) apatite and sphene were extracted in a single sample of an hercynian granite from the Vosges massif in France. In both cases, these rocks had already been dated either by the K/Ar conventional method or by the Ar-40/Ar-39 method on biotite, K-feldspars or amphibole. For this work, from analysis of both the track length distributions and fission track ages the thermal history can be retraced. For the Turkish samples, the apatite fission track ages are interpreted as emplacement ages. On the other side, for the French sample, the apatite and sphene fission track analysis show a moderate reheating episode after the lower Triassic.