对照投料研究中锶浓度、放射性成因(87Sr/86Sr)和稳定同位素(δ88Sr)系统

J. Lewis, A. Pike, C. Coath, R. Evershed
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引用次数: 82

摘要

迁移和古饮食是考古学的两个核心主题,利用骨骼和牙齿的化学分析来重建饮食和活动的趋势和模式已成为生物考古学的基石。为了模拟陆地和海洋蛋白质消耗,本研究对家猪进行了对照饲养试验,研究了锶浓度([Sr])、放射性源(87Sr/86Sr)和稳定锶(δ88Sr)同位素系统。放射性成因(87Sr/86Sr)分析结果验证了锶同位素方法。研究证实,牙釉质的放射性锶同位素组成确实代表了饮食中的放射性锶同位素组成。δ88Sr分析结果显示,富营养化水平向轻同位素Sr偏移0.322±0.060‰。这种变化的幅度与在钙同位素中观察到的类似变化的预测一致。这是首次在控制条件下鉴定出δ88Sr的营养级分异。虽然δ88Sr分析仍处于起步阶段,但它在营养级系统学研究、早期生活饮食趋势研究和成岩变化研究方面具有很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strontium concentration, radiogenic (87Sr/86Sr) and stable (δ88Sr) strontium isotope systematics in a controlled feeding study
ABSTRACT Transhumance and palaeodiet are two central themes in archaeology and using chemical analysis of bones and teeth to reconstruct trends and patterns in diet and mobility has become a cornerstone of bioarchaeology. This study has investigated strontium concentration ([Sr]), radiogenic (87Sr/86Sr) and stable strontium (δ88Sr) isotope systematics in a controlled feeding experiment on domestic pigs designed to simulate terrestrial versus marine protein consumption. The results of the radiogenic (87Sr/86Sr) analysis offer a validation of the strontium isotope methodology. The study confirms that the radiogenic strontium isotope composition of dental enamel does represent the radiogenic strontium isotope composition of the diet. The results of the δ88Sr analysis have revealed a distinct shift of 0.322 ± 0.060 ‰ towards isotopically light Sr with trophic level. The magnitude of this shift is consistent with the predictions from the analogous shift observed in calcium isotopes. This is the first time that trophic level fractionation in δ88Sr has been identified in a controlled setting. Although still in its infancy, δ88Sr analysis has great potential to inform on trophic level systematics, to investigate dietary trends in early life and is potentially useful in examining diagenetic alteration.
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