There is a growing database of radiocarbon (14C) reconstructions from biogenic carbonate taken from marine sediment cores being used to investigate changing ocean circulation and carbon cycling at the end of the last great ice age. Reported here are 14C results from a marine core taken in the Makassar Straits of the western equatorial Pacific that was intended to test whether there was evidence of geologic carbon release to the ocean during the glacial termination. A thorough investigation of planktic and benthic 14C ages with stable isotopes and CT-scans revealed extensive burrowing in the upper 2 m of the core that displaced younger sediments downward by more than half a meter into the glacial section of the core. The vertical displacement is evident in both planktic and benthic fossils. However, the extent of displacement and the stratigraphic disturbance became evident only after multiple measurements of different species and genera. A CT-scan prior to sampling would be an effective screening tool to avoid sampling problem cores such as this.

中文翻译：

---

评估西太平洋浮游生物和底栖生物 14C 记录的地层完整性，用于最后一次冰川终止时的 Δ14C 重建

有一个不断增长的放射性碳数据库（14C) 从海洋沉积物岩芯中提取的生物碳酸盐的重建被用于研究上一个大冰河时代末期海洋环流和碳循环的变化。这里报道的是14C 来自于在赤道西太平洋望加锡海峡采集的海洋岩心，旨在测试在冰川终止期间是否有地质碳释放到海洋的证据。彻底调查浮游生物和底栖生物14具有稳定同位素的 C 年龄和 CT 扫描显示，在岩心上部 2 m 处有广泛的洞穴，将较年轻的沉积物向下移动了半米多，进入岩心的冰川部分。垂直位移在浮游和底栖化石中都很明显。然而，只有在对不同种属进行多次测量后，位移的程度和地层扰动才变得明显。取样前的 CT 扫描将是一种有效的筛查工具，可避免此类取样问题的核心。