| 引用本文: | 胡苗,鲜锋,武振坤,周晓龙.2013.宇宙成因核素10Be的地球化学行为及其在黄土示踪研究中的应用[J].地球环境学报,(1):1197-1207 |
| HU Miao,XIAN Feng,WU Zhen-kun,ZHOU Xiao-long.2013.Studies on the geochemistry behaviors of cosmogenic nuclide 10Be and its applications in loess tracing[J].Journal of Earth Environment,(1):1197-1207 |
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| 宇宙成因核素10Be的地球化学行为及其在黄土示踪研究中的应用 |
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胡苗1,2,3,鲜锋1,2,武振坤1,2,周晓龙1,2,3
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1.中国科学院地球环境研究所 黄土与第四纪地质国家重点实验室，西安 710075;2.陕西省加速器质谱技术及应用重点实验室，西安 710061;3.中国科学院大学，北京 100049
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| 摘要: |
| 10Be是一种典型的长寿命宇宙成因核素，对其在自然界中的分布规律、迁移形式和赋存状态等地球化学行为特征的研究，是利用沉积物10Be记录进行定年和环境示踪研究的理论基础。其中明确10Be在不同沉积物中的赋存状态是研究10Be保存性的基础，而10Be在固相和液相介质中的分配系数Kd则主要反映了10Be在固相和液相中的迁移能力，对研究自然界不同沉积物中10Be的迁移性至关重要，直接影响到沉积物中10Be环境示踪研究的有效性。本文尝试总结了大气成因10Be在海洋、河流沉积物和土壤中的赋存状态，分析了10Be分配系数Kd的分布范围及其主要控制因素。在此基础上以土壤中10Be的分布特征、迁移规律及影响因素研究为参考实例，对比分析了目前已有对黄土-古土壤序列中10Be地球化学行为研究取得的主要成果，建议未来应从地球化学机制方面进一步加强对黄土地层序列10Be分布特征、浓度变化规律及可能影响因素的综合研究，为黄土10Be示踪研究提供更全面的理论依据。 |
| 关键词: 宇宙成因核素10Be 地球化学行为 黄土 示踪 |
| DOI：10.7515/JEE201301003 |
| CSTR：32259.14.JEE201301003 |
| 分类号:P597 |
基金项目:国家自然科学基金项目(41230525，41203019)；中国科学院重点部署项目(KZZD-EW-04)
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| 英文基金项目: |
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| Studies on the geochemistry behaviors of cosmogenic nuclide 10Be and its applications in loess tracing |
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HU Miao1,2,3, XIAN Feng1,2, WU Zhen-kun1,2, ZHOU Xiao-long1,2,3
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1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi′an 710075, China; 2.Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi′an 710061, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| The geochemical study of 10Be, a typical long-lived cosmogenic radioactive nuclide, such as distribution, migration and speciation, is the theoretical basis of 10Be dating and environment tracing. To determine the chemical states of 10Be in different sediments is the foundation of the study of 10Be preservation, and the partition coefficient of 10Be is essential in the study of mobility of 10Be in different sediments, which directly affects the validity of 10Be environmental tracing. In this article, we summarized the study of the chemical states and distribution of the cosmogenic nuclide 10Be in marine sediments, fluvial sediments and soils. We also analyzed the main factors that affect the 10Be partition coefficient. On the basis of the above analysis, we introduced the study of the distribution characteristics and the migration laws of 10Be as well as the controlling factors behind those laws in soil as a concrete example. Compared with that in soil, major achievements of geochemical behavior study of 10Be in loess-paleosol sequence were also introduced. To provide more comprehensive theoretical support for the study of loess 10Be tracing, we should improve the research in geochemistry mechanisms of 10Be distribution characteristics, concentration variation and influencing factors in loess stratigraphic sequence in future work. |
| Key words: cosmogenic nuclide 10Be geochemistry behavior loess tracing |