| 广东凡口铅锌矿区灰岩风化土壤指示元素富集粒度及存在形式研究 |
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| 作者单位： | Wuhan College of Geology，Wuhan 430074 |
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| 摘 要： | 通过广东凡口铅锌矿区灰岩风化残积土壤指示元素富集粒度和存在形式的研究,证实了指示元素在粗、细两端元粒级富集的倾向。但小于200目的细粒级富集稳定性更好。建议将野外直接过200目筛网的土样送交分析。证实了铁锰氧化物是指示元素的主要载体相。锰氧化物比铁氧化物更富集成矿元素。采用土壤重砂的电磁性部分作为样品介质或采用部分提取的方法,均可提高土壤地球化学异常衬度和分析灵敏度。
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| 关 键 词： | 残积土壤 指示元素 富集粒度 存在形式 部分提取 |
THE CONCENTRATION GRAIN SIZE AND MODE OF OCCURRENCE FO SOME INDICATOR ELEMENTS IN SOILS FROM WEATHERED LIMESTONE OVER FANKOU Pb-Zn DEPOSIT, GUANGDONG |
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| Authors: | Zhu Youguang Hu Guojun Qi Shihua |
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| Abstract: | Concentrations of Fe, Mn, Cu, Pb, Zn in different grain fractions of residual soils from weathered limestone over the Pb-Zn Deposit have been determined by atomic absorption spectrometry. The base metals studied tend to accumulate in both coarse and fine size fractions, but to be depleted in the medium sizef raction.The homogeneity, however, is better in the fine grain than in the coarser one.It is suggested that a suitable sample for analysis can be obtained by merely seiving the soil through a 200 mesh screen in the field. Mn-oxide seems to be more effective in concentrating base elements, though both Mnoxide and Fe-oxide and the main scavenging agencies. Finally, the application of electromagnetic separation and partial extraction are proposed in view of improving geochemical contrast. |
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| Keywords: | residual soil indicator element concentrating grain size mode of occurrence partial extraction |
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