Dating Bones near the Limit of the Radiocarbon Dating Method: Study Case Mammoth from Niederweningen, ZH Switzerland
Dating Bones near the Limit of the Radiocarbon Dating Method: Study Case Mammoth from Niederweningen, ZH Switzerland
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接近放射性碳测年方法极限的骨骼测年：瑞士下文宁根猛犸象研究案例
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发表时间：
2009
期刊：
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通讯作者：
H. Furrer
中科院分区：
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作者：
I. Hajdas;A. Michczyński;G. Bonani;L. Wacker;H. Furrer
制备用于放射性碳测年的骨材料仍是一个有待研究的课题。在过去，最有问题的年龄似乎是那些非常古老的骨头，即那些年龄接近定年方法极限的骨头。制备方法的发展需要足够数量的骨材料以及验证年龄的可能性。19世纪末，在瑞士尼德文宁根的泥炭区发现了许多猛犸象和其他动物的骨头。对1890/1891年发掘的这些骨头进行的第一次加速器质谱（AMS）放射性碳年代测定显示，这些骨头的年龄在33000到35000年前之间。2003/2004年的发掘为14C测年提供了额外的材料。从猛犸象骨中提取的明胶经碱（NaOH步骤）清洗后得到的年龄为45870±1080 BP，与埋藏猛犸象的泥炭层得到的年龄45430±1020 BP非常接近。本研究得到的用超滤法清洗明胶的14C年龄为45720±710 BP，与前人得到的结果非常吻合。研究表明，碱+龙金、龙金+超滤、碱+龙金+超滤3种预处理方法的年龄相互吻合，且与泥炭剖面年龄一致。
Preparation of bone material for radiocarbon dating is still a subject of investigation. In the past, the most problematic ages appeared to be the very old bones, i.e. those with ages close to the limit of the dating method. Development of preparative methods requires sufficient amounts of bone material as well as the possibility of verification of the ages. In the peat section at Niederweningen, ZH Switzerland, numerous bones of mammoth and other animals were found in the late 19th century. The first accelerator mass spectrometry (AMS) radiocarbon ages of those bones from 1890/1891 excavations placed the age between 33,000 and 35,000 BP. The excavations in 2003/2004 provided additional material for 14C dating. An age of 45,870 ± 1080 BP was obtained on base (NaOH step) cleaned gelatin from mammoth bone, which was very close to the age of 45,430 ± 1020 BP obtained for the peat layer that buried the mammoths. The 14C age of gelatin cleaned using the ultrafiltration method obtained in this study, 45,720 ± 710 BP, is in a very good agreement with the previously obtained results. Moreover, the study shows that 3 pretreatment methods (base+Longin, Longin+ultrafiltration, and base+Longin+ultrafiltration) give ages consistent with each other and with the age of the peat section.