Stable oxygen isotopes of dental biomineral: differentiation at the intra- and inter-tissue level of modern shark teeth
Stable oxygen isotopes of dental biomineral: differentiation at the intra- and inter-tissue level of modern shark teeth
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DOI：
10.1080/11035897.2013.878747
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发表时间：
2014-01
期刊：
影响因子：
1
通讯作者：
Ž. Žigaitė;M. Whitehouse
中科院分区：
文献类型：
--
作者：
Ž. Žigaitė;M. Whitehouse
采用高精度、高空间分辨率二次离子质谱分析了在恒定水温和盐度条件下生长的沙棘鲨（Carcharhinus plumbeus）牙齿的原位氧同位素组成，分析了平行束状牙釉质（PBE）、缠结束状牙釉质（TBE）和牙本质内的牙齿生物矿物。测量的δ18O值在分析的每个牙齿中具有可比的组织间变异性。PBE类釉质氧同位素比值的散射最小，而TBE类釉质氧同位素δ18O的组织内变异略高，但平均值相近。牙本质变异性最大，平均δ18O值较低。因此，鲨鱼牙齿的牙釉质被推荐为环境和古环境研究的目标生物矿物和首选生物地球化学参考。
In situ oxygen isotopic composition of the sandbar shark (Carcharhinus plumbeus) teeth grown at a constant water temperature and salinity were analysed by high precision and high spatialresolution secondary ion mass spectrometry, targeting dental biomineral within the parallel-bundled enameloid (PBE), the tangle-bundled enameloid (TBE) and the dentine. Measured δ18O values had comparable inter-tissue variability in each tooth analysed. The PBE enameloid had the smallest scatter of oxygen isotope ratios, while the TBE enameloid had slightly higher intra-tissue variation of δ18O, but similar average values. The dentine had largest variability and lower average δ18O. The enameloid of shark teeth is therefore recommended as a target biomineral and a preferential biogeochemical reference for environmental and palaeoenvironmental studies.