原地宇宙成因核素(TCN)测年靶标制备

doi:10.7522/j.issn.1000-0240.2021.0018

摘要/Abstract

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。

关键词: TCN测年技术, 测年靶标, ¹⁰Be与²⁶Al, 第四纪冰川

Abstract:

Since the 1980s， with the development of high-energy accelerator mass spectrometry and the improvement 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 purification； 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.

Key words: TCN dating techniques, dating targets, ¹⁰Be and ²⁶Al, Quaternary glaciations

中图分类号:

P931.4

赵井东,刘瑞连,王潍诚,董子娟,邱锦坤,张亚男,罗崇文. 原地宇宙成因核素(TCN)测年靶标制备[J]. 冰川冻土, 2021, 43(3): 767-775.

Jingdong ZHAO,Ruilian LIU,Weicheng WANG,Zijuan DONG,Jinkun QIU,Yanan ZHANG,Chongwen LUO. Terrestrial in situ cosmogenic nuclides （TCN） dating targets preparation： a case study of its application in Quaternary glaciations research[J]. Journal of Glaciology and Geocryology, 2021, 43(3): 767-775.

图/表 4

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