微束X射线荧光光谱分析红土中铁锰结核内部微小区域（英文）

发布时间：2018-07-01 07:44

  本文选题：微束X射线荧光光谱分析 + 铁锰结核　； 参考：《光谱学与光谱分析》2017年06期

【摘要】：在中国南方第四纪红土剖面中普遍发育一种黑褐色,形状规则或者不规则的新生体,由于其含有较高的Fe和Mn元素而被称为铁锰结核。铁锰结核被认为是土壤中温度、水分、氧化还原条件变化而形成的土壤新生体,因此它被认为是环境信息的良好载体。尤其是结核内部发育的环带状构造,被认识是结核形成过程气候干湿变化的结果。因此对结核内部微小区域的研究,有助与理解红土母质的风化过程以及结核的形成原因。X射线荧光光谱分析在20世纪80年代初已是一种成熟的分析方法,是实验室、现场分析主、次量和痕量元素的首选方法之一。运用帕纳科Zetium X射线荧光光谱仪的微小区域分析工具对铜陵第四纪红土中结核内部由核心至边缘的主量元素分布状况进行分析,结果表明,XRF微小区域分析功能可以快速有效的分析样品内元素的分布状况。结核内部元素分布情况来看,铜陵剖面内铁锰结核内部颜色深浅变化主要是由于Mn元素含量的变化而引起的。结核的核心Mn元素含量最高,由核心向边缘呈现高低交替变化特征。指示结核形成初期,由于气候相对干旱,Mn元素由低价离子态氧化成高价化合物后发生淀积。结核内部浅色环带Si和Al元素含量明显较深色环带高,可能代表了相对湿润的气候时期。
[Abstract]:In the Quaternary laterite section of southern China, a black-brown, regular or irregular neophyte is developed, which is called ferromanganese nodules because of its high Fe and mn contents. Ferromanganese nodules are considered to be soil neovasites resulting from the changes of temperature, moisture, and redox conditions in the soil, so it is considered as a good carrier of environmental information. In particular, the circle-belt structure developed within nodules is recognized as the result of climatic dryness and wetness during the formation of nodules. Therefore, the study of microregions inside nodules helps to understand the weathering process of the parent material of laterite and the causes of the formation of nodules. X-ray fluorescence spectroscopy (XRF) analysis was a mature analytical method and a laboratory in the early 1980s. One of the preferred methods for field analysis of primary, secondary and trace elements. The distribution of principal elements from core to edge of nodules in Quaternary laterite in Tongling was analyzed by means of the small area analysis tool of Panako Zetium X-ray fluorescence spectrometer. The results show that XRF can be used to analyze the distribution of elements in the samples quickly and effectively. The distribution of elements in the nodules is mainly caused by the change of mn content in the iron manganese nodules in Tongling section. The content of mn in the core of nodules is the highest, and the change from core to edge is alternately high and low. It is indicated that mn element was oxidized from low valence ion state to high valence compound in the early stage of nodule formation because of the relatively dry climate. The contents of Si and Al elements in the light colored ring zone are obviously higher than those in the deep color ring zone, which may represent a relatively humid climatic period.
【作者单位】： 华东师范大学地理科学学院;安徽师范大学国土资源与旅游学院;安徽师范大学环境与地理信息工程安徽省工程技术研究中心;浙江师范大学地理与环境学院;
【基金】：the National Natural Science Foundation of China(41201008,41371032)
【分类号】：O657.34;S153
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本文编号：2087056