Abstract
Geochemical alteration process of the sediments in the archaeological site may affect thenvironmental radiation dose rate during the burial history, this will cause the inaccuracy of the age determination by radiation exposure dating methods, such as TL (thermoluminescence) or ESR (electron spin resonance) method. In Caune de l’Arago site, France, the original geochemical composition of the carbonate deposition in the layer Sol G, which found the Arago XXI skull, was modified, and formed a funneled phosphate section due to the acidification effect of guano during the historical period. Six teeth fossil samples from the different deposit environment of this layer were analyzed by combined ESR and U-series methods. The results show that the teeth samples from phosphate and carbonate area were consistent with the possible reference age – 450 ka in general, but the samples from non-altered area have given the age about 100 ka younger than others. The reason for this difference is still under discussion.
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