A Case Study Using 10Be-26Al Exposure Dating at the Xi’an AMS Center
A Case Study Using 10Be-26Al Exposure Dating at the Xi’an AMS Center
复制标题
DOI：
10.1017/rdc.2015.20
复制
发表时间：
2016-01
期刊：
影响因子：
8.3
通讯作者：
Li Zhang;Zhenkun Wu;Hong Chang;Ming Li;G. Dong;Yunchong Fu;Guoqing Zhao;Weijian Zhou
中科院分区：
文献类型：
--
作者：
Li Zhang;Zhenkun Wu;Hong Chang;Ming Li;G. Dong;Yunchong Fu;Guoqing Zhao;Weijian Zhou
摘要用10Be和26Al原位测定河流阶地的暴露年龄是一种非常有用的技术。这在半干旱地区尤其如此，因为其他方法缺乏合适的测年材料。本文介绍了西安加速器质谱学(AMS)中心建立的10Be和26Al原位研究的样品制备方法和分析基准。本研究采用一种改进的样品制备方法，对四个比对样品进行了分析。曝光年龄结果与已发表的数据吻合较好，说明了该测年方法的可靠性。本文还给出了采自青藏高原东北部祁连山关山河一系列河流阶地的石英样品的新的10Be和26Al结果。金佛寺遗址三个河流阶地的年龄分别为(56.4±5.3)ka、(10.7±1.0)ka和(7.2±1.0)ka。测年结果与同一地区已公布的数据(10Be、14C和光激发发光测年方法)一致。高分辨率气候记录与阶地形成的年龄限制的对比表明，阶地形成与气候变化之间存在着密切的关系。
ABSTRACT Exposure age dating using in situ 10Be and 26Al is a very useful technique for dating fluvial terraces. This is especially true in semiarid regions where other methods suffer from a paucity of suitable dating materials. This article describes sample preparation procedures and analytical benchmarks established at the Xi’an Accelerator Mass Spectrometry (AMS) Center for the study of in situ 10Be and 26Al. Four intercomparison samples were analyzed in the study, using an improved sample preparation method. The exposure age results are shown to be in good agreement with published data, and demonstrate the reliability of the dating method. This article also presents new 10Be and 26Al results from quartz samples collected from a series of fluvial terraces from Guanshan River, along the Qilian Shan, northeastern Tibetan Plateau. The ages of three fluvial terraces from the Jinfosi site are shown to be (56.4±5.3) ka for T3, (10.7±1.0) ka for T2, and (7.2±1.0) ka for T1. The dating results are consistent with published data from the same region (10Be, 14C, and optically stimulated luminescence dating methods). A comparison of high-resolution climate records with age constraints for the terrace formation shows a close relationship between terrace formation and climate change.