Datations des cendres volcaniques et analyses géochimiques du remplissage d'Orgnac 3 (Ardèche, France)

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Abstract
In the upper levels of Orgnac 3, fresh volcanic ashes trapped in burrows have been discovered allowing the fisson track method of dating to be used on the zircon crystals and which have given an absolute date of 298000 ± 55000 years. The mineralogy of the sediments of the archaeological levels 1 and 2 reveals a sedimentation without an interruption. The geochemical study has revealed a diagenesis of carbonates under the form of concretions and encrustations as well as a diagenesis of calcium phosphates, present in the form of apatite, from bone alteration. We have been able to put into evidence in the upper levels of the infill the formation of a palaeosoil which has resulted from an intense alteration of volcanic minerals.

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