Evidence of physico-chemical and isotopic modifications in archaeological bones during controlled acid etching

被引:30
作者
Balter, V [1 ]
Saliège, JF
Bocherens, H
Person, A
机构
[1] Univ Paris 06, F-75252 Paris 05, France
[2] Univ Bordeaux 1, F-33405 Talence, France
关键词
Quaternary bones and teeth; carbonate hydroxylapatite; carbon and oxygen isotopes; palaeoecology; radiocarbon; diagenesis; chemical pretreatment;
D O I
10.1111/1475-4754.t01-1-00065
中图分类号
K85 [文物考古];
学科分类号
0601 ;
摘要
It has been repeatedly shown that palaeoecological inferences from the elemental and isotopic content of carbonate hydroxylapatite of fossil teeth and bones are unrecoverable without removing diagenetic overprinting by chemical pretreatments. Such pretreatments may in turn cause modification of the biogenic signature. In this paper, we focus upon optimal removal of Ca-bearing carbonates (mainly calcite). In order to control the progress with time of calcite dissolution, we perform leaching under vacuum, and we monitor the evolution of th pH, pCO(2), delta C-13 and delta O-18 of the remaining mineral. For a set of different Quaternary bones and teeth, mass and isotopic balances indicate that 1 hour at most is necessary for complete dissolution of calcite with an optimal conservation of carbonate hydroxylapatite. Long-lasting experiments lead to a fractionation of hydroxylapatite O-18/O-16 carbonates.
引用
收藏
页码:329 / 336
页数:8
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