Radiocarbon and Stable Carbon Isotope Analyses of Land Snails from the Chinese Loess Plateau: Environmental and Chronological Implications
Radiocarbon and Stable Carbon Isotope Analyses of Land Snails from the Chinese Loess Plateau: Environmental and Chronological Implications
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DOI：
10.1017/s0033822200045094
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发表时间：
2010
期刊：
影响因子：
8.3
通讯作者：
Bing Xu;Z. Gu;Jingtai Han;Zong-xiu Liu;Y. Pei;Yanwu Lu;N. Wu;Yongfu Chen
中科院分区：
文献类型：
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作者：
Bing Xu;Z. Gu;Jingtai Han;Zong-xiu Liu;Y. Pei;Yanwu Lu;N. Wu;Yongfu Chen
对中国黄土高原钉螺的文石壳和有机软体进行了配对的放射性碳和稳定碳分析，以探索将其作为环境和年代学指标的可能性。结果表明，软体的14C浓度与植物叶片相似，表明软体中的碳是通过有机饲料固定的。与软体相比，文石壳体由于摄取了14C贫化的碳酸盐而被贫化了14C。这种损耗在中国黄土高原呈现出一致的模式，这意味着蜗牛壳具有很好的潜力，通过简单的校正就可以应用于14C测年。文石壳体测得的δ~(13)C值与具有恒定偏移量的软体测得的值呈线性关系。此外，有机饲料产生的碳占贝壳碳总量的70%以上。这一事实表明，文石壳的稳定碳同位素组成主要反映了有机饮食的碳同位素组成，可以作为中国黄土高原古饮食的可靠指示。
Paired radiocarbon and stable carbon analyses have been carried out on aragonite shells and organic soft bodies of snails from the Chinese Loess Plateau in order to explore the possibility of using these kinds of samples as environmental and chronological indicators. Results show that the soft bodies exhibit 14C concentrations similar to those of plant leaves, indicating that carbon in the soft bodies is fixed from organic diets. The aragonite shells are depleted in 14C compared to the soft bodies due to ingestion of 14C-depleted carbonate. This depletion shows a consistent pattern across the Chinese Loess Plateau, implying a good potential for the snail shells to be applicable for 14C dating with a simple correction. The δ13C values measured for aragonite shells display a linear relationship with those obtained for the soft bodies with a constant offset. In addition, the carbon derived from organic diets accounts for more than 70% of the total shell carbon. This fact suggests that stable carbon isotope composition of aragonite shells mainly reflects that of organic diet, and could be used as a reliable indicator of paleodiet in the Chinese Loess Plateau.