Radiocarbon-age differences among coexisting planktic foraminifera shells: The Barker Effect
Radiocarbon-age differences among coexisting planktic foraminifera shells: The Barker Effect
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DOI：
10.1029/2011pa002116
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发表时间：
2011-06-16
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影响因子：
--
通讯作者：
Clark, Elizabeth
中科院分区：
文献类型：
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作者：
Broecker, Wally;Clark, Elizabeth
对于缓慢积累的沉积物，共存的浮游有孔虫壳之间的放射性碳年龄差异存在着显着的溶解和少量溶解的差异。在前者中，年龄通常一致在几百年之内。在后者中，长达 1000 岁的年龄差异很常见。最可能的解释似乎是巴克效应，其中涉及易于溶解的 G. sacculifer 和 G. ruber 的优先分裂。这些用于放射性碳测年的物种的整个贝壳在生物扰动区的停留时间比那些抗溶解物种（包括底栖动物）的要短。由于低积累率沉积物岩心通常无法得出可靠的基于放射性碳的海洋通风年龄，因此在可能的情况下，应在高积累率岩心上进行此类研究。
For slowly accumulating sediments, a major contrast exists in the radiocarbon-age differences among coexisting shells of planktic foraminifera between those experiencing little dissolution and those experiencing significant dissolution. In the former, the ages generally agree to within a couple of hundred years. In the latter, age differences as large as 1000 years are common. The most likely explanation appears to be the Barker Effect, which involves the preferential fragmentation of dissolution-prone G. sacculifer and G. ruber. The whole shells of these species picked for radiocarbon dating have shorter residence times in the bioturbation zone than those for dissolution-resistant species (including benthics). As low accumulation rate sediment cores often fail to yield reliable radiocarbon-based ocean ventilation ages, where possible, such studies should be conducted on high accumulation rate cores.