AMS 14C chronologies of Holocene lake sediments in the Abisko area, northern Sweden -: a comparison between dated bulk sediment and macrofossil samples
AMS 14C chronologies of Holocene lake sediments in the Abisko area, northern Sweden -: a comparison between dated bulk sediment and macrofossil samples
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DOI：
10.1080/11035899801201059
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发表时间：
1998-03-01
期刊：
影响因子：
1
通讯作者：
Sandgren, P
中科院分区：
文献类型：
--
作者：
Barnekow, L;Possnert, G;Sandgren, P
将大量沉积物样品的 AMS 放射性碳测年结果与瑞典北部两个邻近湖泊的陆地植物大型化石的 AMS 放射性碳测年结果进行了比较。两个沉积物序列都涵盖了从末次冰消期至今的时期。西藏湖的沉积物是高钙质的，而沃莱普·尼亚卡贾乌雷湖的层状沉积物主要由藻类Gyttja组成，碳酸盐碳含量较低。放射性碳测年的陆地大型化石的年龄与 Vuolep Njakajaure 湖的纹层年代学非常一致。所有大量沉积物样品给出的放射性碳年龄比从陆地大化石获得的放射性碳年龄要老。西藏湖的放射性碳年龄误差的大小在整个剖面中并不是恒定的，而是在 c. 550至2700年。该误差在 Vuolep Njakajaure 湖中不太明显，范围为 c. 250到800年。瑞典北部拉普兰地区冰消期的确定通常依赖于大量沉积物的日期，但这可能是错误的。湖泊沉积物的放射性碳年代学必须基于陆地大型化石的放射性碳年代学。
AMS-radiocarbon dates of bulk sediment samples were compared to AMS-radiocarbon dates of terrestrial plant macrofossils from two neighbouring lakes in northern Sweden. Both sediment successions cover the period from the last deglaciation to the present. The sediments in Lake Tibetanus are highly calcareous, whereas the laminated sediments in Lake Vuolep Njakajaure are composed mainly of algal gyttja with a low carbonate carbon content. The ages of the radiocarbon dated terrestrial macrofossils are in close agreement with the lamina chronology in Lake Vuolep Njakajaure. All bulk sediment samples give older radiocarbon ages than radiocarbon ages obtained from terrestrial macrofossils. The magnitude of the radiocarbon age error in Lake Tibetanus is not constant throughout the profile but ranges from c. 550 to 2700 years. The error is less pronounced in Lake Vuolep Njakajaure and ranges from c. 250 to 800 years. Determination of the deglaciation age in this region of northern Swedish Lappland generally relies on bulk sediment dates, which are likely to be erroneous. Radiocarbon chronology of lake sediments must be based on radiocarbon dates of terrestrial macrofossils.