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首页> 外文期刊>Paleoceanography >Anomalous radiocarbon ages for foraminifera shells
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Anomalous radiocarbon ages for foraminifera shells

机译：有孔虫壳的放射性碳年龄反常

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The causes for discordant radiocarbon results on multiple species of planktonic foraminifera from high-sedimentation-rate marine sediments are investigated. We have documented two causes for these anomalous results. One is the addition of secondary radiocarbon for which we have, to date, only one firm example. It involves an opal-rich sediment. The other is the incorporation of reworked material. Again, we have, to date, only one firm example. It involves a rapidly deposited ocean margin sediment. However, we have three other examples where reworking is the most likely explanation. On the basis of this study it is our conclusion that, where precise radiocarbon dating of high-deposition-rate marine sediment is required, a prerequisite is to demonstrate that concordant ages can be obtained on pairs of fragile and robust planktic shells. For sediment rich in opal, it is advisable to check for secondary calcite by comparing ages obtained on acid-leached samples with those on unleached samples.
机译：研究了高沉积速率海洋沉积物中多种浮游有孔虫的放射性碳结果不一致的原因。我们已经记录了导致这些异常结果的两个原因。一种是添加二次放射性碳，到目前为止，我们仅以一个可靠的例子为例。它包含富含蛋白石的沉积物。另一个是合并返工材料。再一次，到目前为止，我们只有一个坚定的例子。它涉及迅速沉积的海洋边缘沉积物。但是，我们还有另外三个例子，其中最有可能是返工。根据这项研究，我们得出的结论是，在需要对高沉积速率海洋沉积物进行精确放射性碳测年的前提下，先决条件是证明可以在成对的脆弱而坚固的板壳上获得一致的年龄。对于富含蛋白石的沉积物，建议通过比较酸浸样品和未浸出样品的年龄来检查次方解石。

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