原地宇宙成因核素(TCN)测年靶标制备——以第四纪冰川研究中的应用为例  

Terrestrial in situ cosmogenic nuclides(TCN)dating targets preparation:a case study of its application in Quaternary glaciations research

作　　者：赵井东 刘瑞连 王潍诚 董子娟 邱锦坤 张亚男 罗崇文 ZHAO Jingdong;LIU Ruilian;WANG Weicheng;DONG Zijuan;QIU Jinkun;ZHANG Yanan;LUO Chongwen(State Key Laboratory of Cryospheric Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Western China’s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2021年第3期767-775,共9页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41771018;41830644;41371028);冰冻圈科学国家重点实验室开放基金项目(SKLCS-OP-2020-1)资助。

摘　　要：自20世纪80年代以来,得益于高能加速器质谱的发展及其分析精度的提高,TCN测年技术得到了快速发展,并被成功应用于解决诸多领域关键性的年代学问题研究中,对地学的发展也起到了革命性的推动作用。TCN测年由测年靶标制备、AMS测量及数据分析等步骤组成。其中测年靶标制备直接影响AMS的测量结果,进而影响可靠年代学框架的建立与古气候环境的重建。测年靶标制备首先是代表性样品的采集,继而是所用靶标矿物的提纯,再者是所测元素的分离提取,最后是靶标压制。此处以第四纪冰川研究中应用较为广泛的TCN放射性核素10Be与26Al为例,结合冰川侵蚀与沉积地貌的分布及其特征,从样品采集、石英提纯、10Be与26Al核素的分离提取及最后的靶标压制等方面展开论述,以期为初涉第四纪冰川研究的学者提供TCN测年靶标制备的理论指导,同时也为地学其他研究领域该测年技术的应用提供参考。Since the 1980s,with the development of high-energy accelerator mass spectrometry and the improve⁃ment of its analysis accuracy,terrestrial in situ cosmogenic nuclides(TCN)dating techniques has been rapidly developed and applied,and geochronology frameworks have been established in many disciplines.More and more facts demonstrate that the TCN dating techniques have revolutionized the development of geoscience.TCN dating techniques consist of dating target preparation,accelerator mass spectrometry(AMS)measurement,data analysis and others.The quality of dating targets preparation will directly affects the AMS measurement,and then affects the reliable chronological framework establishment and palaeo-environment reconstruction.The first step of dating target preparation is the high-quality sample collection;the second is the quartz extraction and puri⁃fication;the third is the 10Be and 26Al separation and extraction;and final is the dating targets suppression.Here,we will take TCN radionuclides 10Be and 26Al,which are widely used in the Quaternary glaciations research as an example,combining with the distribution and characteristics of glacial erosional and depositional landforms,sample collection,quartz extraction and purification,10Be and 26Al separation and extraction and dating targets suppression to discuss its application in the Quaternary glaciations research.This paper can provide theoretical guidance for the TCN dating target preparation for the new scholars to study the Quaternary glaciations,and can also provide reference for the scholars in other geoscience fields to apply this dating techniques.

关 键 词：TCN测年技术 测年靶标 10Be与26Al 第四纪冰川 

分 类 号：P931.4[天文地球—自然地理学]