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关中地区2万年以来黄土序列中蜗牛化石及其有机质的14C-AMS测年初探

DOI: 10.11867/j.issn.1001-8166.2008.09.0959, PP. 959-964

Keywords: 关中黄土,蜗牛化石,14C加速器测年

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Abstract:

前人在黄土—古土壤地层的14C年代学研究中,探讨了不同测年物质的可靠性,但不同物质组分获得的年代差异较大,这是由于选用的样品不符合定年条件,所以选择可靠的样品组分和有效的前处理方法显得尤为重要。对关中地区2万年以来黄土序列中有机质、花粉浓缩物和蜗牛化石进行了AMS14C年代学研究。运用现生蜗牛壳体的AMS14C测定来校正化石蜗牛的年龄,结合剖面中孢粉浓缩物、土壤有机质的AMS14C年代学对比研究,发现蜗牛化石壳体的文石可以提供较可靠的年代数据,为14C测年的可靠性研究提供了一种可能的途径。

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