激光剥蚀原位铀系法对化石年龄的测定
收稿日期: 2024-02-06
录用日期: 2024-04-07
网络出版日期: 2025-08-07
基金资助
国家重点研发计划(2020YFC1521500)
U-series in situ dating of fossils by LA-MC-ICPMS
Received date: 2024-02-06
Accepted date: 2024-04-07
Online published: 2025-08-07
刘玥 , 焦亚诺 , 卢泽基 , 胡贵兰 , 邵庆丰 . 激光剥蚀原位铀系法对化石年龄的测定[J]. 人类学学报, 2025 , 44(04) : 700 -714 . DOI: 10.16359/j.1000-3193/AAS.2024.0072
U-series dating of fossil bones and teeth is based on the fact that U is incorporated into the fossils during their burial and subsequently decays to the daughter nuclides towards equilibrium. However, it has been long-known that the diagenetic phenomenon of uranium uptake influences the reliability of U-series dating of fossils. Over the past two decades, significant advances have been made in the technology of U and Th isotopic analyses. Today, it is able to achieve ɛ-precision of U-Th isotopic ratios using the state of art of Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICPMS) and to achieve micrometer scale of spatial resolution with Laser Ablation-ICPMS (but with lower precision). It seems most timely to further develop U-series dating method for fossils using the high-precision and high-resolution analytical techniques. We therefore developed a LA-MC-ICPMS method for U-series in situ dating of fossil samples from Paleolithic and/or paleoanthropological sites. We described the details of our method, including standard preparation, LA-MC-ICPMS calibration, laser ablation, U-Th isotopic measurements and data treatment. Using the newly established method, we analyzed two mammalian fossil teeth from the Xujiayao hominin site, in Nihewan Basin. The sample XJY-1929, from the Upper Culture Layer, displayed U-shaped distribution of U-content, 234U/238U and 230Th/238U activity ratios, indicating an early uptake process, and yielded a DAD model age of 172.0±5.1 kaBP, representing a minimum age of this fossil. The sample XJY-3055, from the Lower Culture Layer, however, showed apparently lower U-content, 234U/238U and 230Th/238U activity ratios, with a DAD model age of 58.8±4.5 kaBP, which is much younger than the geologic age of the layer. This sample probably experienced a later U-uptake, caused by the redox conditions in the Lower Culture Layer.
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