10:45 AM - 11:00 AM
[SGC46-01] Strontium three isotope analysis of archaeological human bones: the effect of diagenetic alteration
Keywords:Sr isotope ratio, archaeological sciences, diagenetic alteration, apatite, cremated human bones
Archeological human remains have been buried in soils for hundreds of years or more. There is a strong possibility that the buried human bones have been affected by diagenetic process and the original 87Sr/86Sr values of the bone hydroxyapatites have been changed by such secondary alteration. Although evaluation of the effect of possible diagenetic alteration is essential in reconstructing the residential mobility of ancient humans from the bone hydroxyapatite 87Sr/86Sr data, reactivity of bone hydroxyapatite during diagenetic processes is not well understood.
In this study, we attempt to make a quantitative evaluation of secondary alteration effect on the bone hydroxyapatite 87Sr/86Sr during diagenesis. Hydroxyapatite fractions were extracted from a cremated human remain of a Buddhist priest Jokei (AD1155-1213) and three different cremated bodies excavated from Middle age sites in Binman-ji, Shiga, Japan. Bulk soil samples from the excavation sites as well as exchangeable phases of these soils were also prepared. Both the radiogenic (87Sr/86Sr) and stable (δ88Sr/86Sr) isotope ratios were analyzed for these samples. The results will be discussed in the presentation.