Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China
Yu, XL; Fu, YN; Brookes, PC; Lu, SG; Lu, SG (reprint author), Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China.
2015
发表期刊SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
ISSN0361-5995
卷号79期号:4页码:1101—1114
文章类型期刊文献
摘要In this work, we collected different size Fe-Mn nodules from a Plinthudult in the subtropical region of China and studied their internal structure and the distribution of trace elements by three synchrotron-based X-ray microprobe techniques: X-ray micro-computed tomography (SR-mCT), X-ray micro-fluorescence (mu-XRF), and micro X-ray absorption near edge structures (mu-XANES). The SR-mCT images reveal that the large nodules (2-3, 3-5, and 5-8 mm in diameter) have distinct Fe and Mn concentric ring structure, while the small nodule (1-2 mm) exhibits a homogeneous fabric. The mu-XRF maps show that Mn is concentrated near the nucleus of the nodule, while Fe is more concentrated in the exterior of the nodule. The 1- to 2-mm nodule has significantly higher total porosity than the >2-mm nodules; however, the spatial distribution of pores within the nodules indicates that the >2-mm nodules have smaller >30-mm pores and show more anisotropy in the outer part than in the inner part. The porosity and pore anisotropy of the nodules were considered to affect the size and shape of Fe-Mn nodules in soil. Quantification of the ring structure for the 3- to 5-mu m nodule reconstructed the formation process of the nodule, showing that the nodule was formed through two growth stages, with each stage consisting of two and five redox processes. The internal structure of Fe-Mn nodules not only records pedo-environmental changes during the formation process but also provides ample opportunity for the adsorption and sequestration of trace elements from the soil.
关键词Fe-mn Nodules Trace-element Associations Ferromanganese Nodules Computed-tomography Selective Dissolution Carpathian Foothills Xanes Spectroscopy Concretions Oxides Accumulation
语种英语
WOS记录号WOS:000361048300010
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24966
专题中科院上海应用物理研究所2011-2018年
通讯作者Lu, SG (reprint author), Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China.
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Yu, XL,Fu, YN,Brookes, PC,et al. Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2015,79(4):1101—1114.
APA Yu, XL,Fu, YN,Brookes, PC,Lu, SG,&Lu, SG .(2015).Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,79(4),1101—1114.
MLA Yu, XL,et al."Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 79.4(2015):1101—1114.
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