Methodological study on exposure date of Tiankeng by AMS measurement of in situ produced cosmogenic 36Cl

Methodological study on exposure date of Tiankeng by AMS measurement of in situ produced cosmogenic 36Cl
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AMS测量原位产生宇宙36Cl测定天坑暴露日期的方法学研究

DOI:
10.1016/j.nimb.2012.07.048
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发表时间:
2013
期刊:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
影响因子:
--
通讯作者:
管永精
管永精
中科院分区:
其他
文献类型:
--
作者:
Yuki Matsushi;Huang Baojian;阮向东;管永精

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[en]天坑是典型的晚第四纪岩溶地貌。天坑暴露年龄的研究对阐明天坑的形成条件、发育过程和生物种类特征具有重要的地理意义。天坑破裂断面表层的~(36)Cl主要是由宇宙成因高能中子诱发反应~(40)Ca(n,αp)和~(39)K(n,α)产生的,并在天坑形成后积累。低能中子反应35 Cl(n,γ)贡献了36 Cl的一小部分。本文利用中国原子能科学研究院加速器质谱(AMS)实验室和日本筑波大学加速器质谱(AMS)实验室联合测定了广西壮族自治区乐业县大石围天坑岩石样品中宇宙成因的~(36)Cl浓度,以估算天坑的形成时间(或暴露年龄)。结果表明,大石围天坑的暴露时间约为26± 9.6ka(未作侵蚀校正)。采样策略和程序,实验装置,和初步结果将详细介绍。
[en] Tiankeng is a typical Karst relief of the late Quaternary Period. Studies on the exposure ages of Tiankeng are very important in geographical research to elucidate the formation condition, the developing process, and the features of biological species. 36 Cl on the surface layer of the rupture cross-section of Tiankeng is largely produced by cosmogenic high-energy neutron induced reactions 40 Ca (n, αp) and 39 K (n, α), and has accumulated since the formation of the Tiankeng. Low-energy neutron reaction 35 Cl (n, γ) contributes a small portion of 36 Cl. In this work, the concentration of the cosmogenic 36 Cl in rock samples taken from Dashiwei Tiankeng, Leye County, Guangxi Zhuang Autonomous Region, China, was measured jointly by Accelerator Mass Spectrometry (AMS) laboratories of CIAE and University of Tsukuba in an effort to estimate the formation time (or exposure age) of the Tiankeng. The results show that the exposure time of Da Shiwei Tiankeng is about 26±9.6 ka (without erosion correction). The sampling strategy and procedures, experimental set-up, and preliminary results will be presented in detail.
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