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Pre-nuclear level of I-129 in Chinese loess-paleosol sections: A search for the natural I-129 level for dating in terrestrial environments
Fan, Yukun1,2; Zhou, Weijian1,2,3; Hou, Xiaolin1,2
2018-06-15
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
Volume231Issue:4Pages:64-72
SubtypeArticle
AbstractDue to its long half-life (15.7 Myr), radioactive I-129 has great potential for dating geologic materials as old as 100 Myr. Thus, knowing the natural level of I-129 is crucial to dating applications. The initial ratio of I-129/I-127 in the ocean has been quantified by a number of researchers who have reached a consensus value. However, the applicability of I-129 dating in the terrestrial environment remains problematic because the lack of an initial I-129/I-127 value. In this work, samples of loess-paleosol sections from the Chinese Loess Plateau (CLP) were analyzed for I-129/I-127, aiming to provide an Initial I-129/I-127 ratio that can be adopted for dating purposes in terrestrial environments. A value of (2.0 +/- 1.0) x 10(-11) for the I-129/I-127 ratio was found in two investigated loess-paleosol sections from Xifeng and Luochuan, China. This ratio is one order of magnitude higher than the initial value reported for the marine environment. Alteration of the natural initial I-129 In the investigated samples due to the downward migration of anthropogenic I-129 and by excess fissiogenic I-129 from uranium was not supported. Consequently, the I-129/I-127 ratio measured is considered to be a pristine value, and the difference from that In the marine systems is attributed to an Isotopic dilution effect. (C) 2018 Elsevier Ltd. All rights reserved.
KeywordI-129 Dating Initial I-129/i-127 Ratio Loess Ams
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.gca.2018.04.014
WOS KeywordACCELERATOR MASS-SPECTROMETRY ; PORE WATERS ; MARINE-SEDIMENTS ; IODINE ; ORIGIN ; I-129/I-127 ; DEPOSITS ; PLATEAU ; SAMPLES ; TRACER
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000432750300005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5129
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China
2.Xian AMS Ctr, Shaanxi Key Lab AMS Technol & Applicat, Xian, Shaanxi, Peoples R China
3.Beijing Normal Univ, Joint Ctr Global Change Studies, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Fan, Yukun,Zhou, Weijian,Hou, Xiaolin. Pre-nuclear level of I-129 in Chinese loess-paleosol sections: A search for the natural I-129 level for dating in terrestrial environments[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,231(4):64-72.
APA Fan, Yukun,Zhou, Weijian,&Hou, Xiaolin.(2018).Pre-nuclear level of I-129 in Chinese loess-paleosol sections: A search for the natural I-129 level for dating in terrestrial environments.GEOCHIMICA ET COSMOCHIMICA ACTA,231(4),64-72.
MLA Fan, Yukun,et al."Pre-nuclear level of I-129 in Chinese loess-paleosol sections: A search for the natural I-129 level for dating in terrestrial environments".GEOCHIMICA ET COSMOCHIMICA ACTA 231.4(2018):64-72.
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