Infrared and Isotopic Evidence for Diagenesis of Bone Apatite at Dos Pilas, Guatemala: Palaeodietary Implications
Infrared and Isotopic Evidence for Diagenesis of Bone Apatite at Dos Pilas, Guatemala: Palaeodietary Implications
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DOI：
10.1006/jasc.1996.0087
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发表时间：
1996-11
影响因子：
2.8
通讯作者：
L. E. Wright;H. Schwarcz
中科院分区：
文献类型：
--
作者：
L. E. Wright;H. Schwarcz
摘要利用骨磷灰石稳定碳同位素分析重建史前饮食的方法受到埋藏过程中碳酸盐可能发生成岩蚀变的阻碍。我们研究磷灰石保存在古典时期玛雅骨骼仍然从多斯皮拉斯，危地马拉，使用傅里叶变换红外光谱（FTIR）。我们使用的重量% CO2从磷灰石，FTIR碳酸盐/磷酸盐吸收率比，磷酸盐峰分裂结晶度指数，氟化物峰，和稳定的氧同位素比，以确定磷灰石化学成岩变化。同位素轻碳从埋葬土壤中采取了充分的去除大多数多斯皮拉斯骨处理用稀醋酸，但更严重的改变不能逆转的标准制备方法。红外线标准确定了Dos Pilas墓葬中的重结晶磷灰石，伴随着同位素交换，不再保留生物δ 13 C。这些结果表明，相对较新的骨可能发生成岩作用改变，并证明在用磷灰石δ 13 C解释古饮食之前，需要对所有考古骨中的矿物完整性进行系统评价。
Abstract The use of stable carbon isotopic analysis of bone apatite to reconstruct prehistoric diets is hindered by the possibility of diagenetic alteration of carbonate during burial. We examine apatite preservation in Classic Period Maya skeletal remains from Dos Pilas, Guatemala, using Fourier transform infrared spectroscopy (FTIR). We use weight % CO 2 evolved from apatite, FTIR carbonate/phosphate absorbance ratios, phosphate peak splitting crystallinity indices, fluoride peaks, and stable oxygen isotopic ratios to identify diagenetic change in apatite chemistry. Isotopically light carbon taken up from burial soil is adequately removed from most Dos Pilas bone by treatment with dilute acetic acid, but more severe alteration cannot be reversed by standard preparation methods. Infrared criteria identify recrystallized apatite in a subset of Dos Pilas burials, that is accompanied by isotopic exchange, and that no longer preserves biogenic δ 13 C. These results illustrate that comparatively recent bone may be diagenetically altered and demonstrate a need for systematic evaluation of mineral integrity in all archaeological bone prior to interpreting paleodiets with apatite δ 13 C.