Laser ablation depth profiling of U-series and Sr isotopes in human fossils
Laser ablation depth profiling of U-series and Sr isotopes in human fossils
复制标题
DOI：
10.1016/j.jas.2013.02.028
复制
发表时间：
2013-07-01
影响因子：
2.8
通讯作者：
Gruen, Rainer
中科院分区：
文献类型：
--
作者：
Benson, Alexa;Kinsley, Les;Gruen, Rainer
我们已经探索了激光深度剖析，以获得数据集的U系列以及Sr分析。81克光斑大小的激光探测允许在牙釉质外表面下探索高达400克的低铀域。这些低U域将包含Sr同位素组成的个人，是受成岩Sr叠印的影响最小。为U测量而钻的小孔是肉眼看不到的。使用约233 gm的较大光斑尺寸，激光钻孔可用于获得可靠的U系列同位素数据，深度约为牙釉质中的1000 gm和骨中的1300 gm。此外，也可以获得有意义的Sr-87/Sr-86同位素数据与此点的大小。使用我们的采样策略，对人类牙齿的整体损害是微小的，正如Moula-Guercy的尼安德特人牙齿所证明的那样。我们预计激光烧蚀深度分析将成为了解人类化石年龄和古人类迁徙的常规方法。(C)2013爱思唯尔有限公司保留所有权利。
We have explored laser depth profiling to obtain data sets for U-series as well as Sr analyses. Laser probing with an 81 gm spot size allows for the exploration of low uranium domains of up to 400 gm below the outer surface in tooth enamel. These low U domains will contain Sr isotope compositions of the individual, that are least affected by diagenetic Sr overprints. The small holes drilled for U surveying are not visible to the naked eye. Using larger spot sizes of around 233 gm, laser drilling can be used to obtain reliable U-series isotope data to a depth of approximately 1000 gm in enamel and around 1300 gm in bone. Furthermore, meaningful Sr-87/Sr-86 isotope data can also be obtained with this spot size. Using our sampling strategy, the overall damage to a human tooth is minute, as demonstrated on a Neanderthal tooth from Moula-Guercy. We expect that laser ablation depth profiling will become routine for gaining insights into the age of human fossils and the migrations of ancient humans. (C) 2013 Elsevier Ltd. All rights reserved.