陕西扶风新集黄土剖面中的稀土元素
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RARE EARTH ELEMENTS IN TOP SOIL AND BURIED SOILS OF XINJI LOESS PROFILE IN SHAANXI PROVINCE
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    摘要:

    本工作用仪器中子活化法(INAA)测定了陕西新集近40米厚的黄土剖面中5个埋藏古土壤层的10个稀土元素。结果表明,其20个不同层次的土样中稀土总含量在157—231.68ppm之间,平均为199ppm,接近北美页岩。各层土壤稀土含量有差别,可能是碳酸钙在各层中起着稀释剂作用的缘故。消除它的影响后,各层稀土含量很接近。黄土系陆相沉积类型,富含Ce族元素,各层甲稀土元素的配分模式很相似,没有显著的分馏异常现象,反映了黄土在来源区和堆积区的漫长岁月里处于相似的弱碱性界质和较干燥通气良好的条件下,淋溶不太强烈。

    Abstract:

    In this paper the contents and distribution patterns of rare earth elements (REE) in soils are discussed based on the analytical data of 20 soil samples collected from Yinji loess profile in Shaanxi Province. There are five buried soils in the loelss profile with a thickness of 39.7 m.. The fifth horizon Qonsists of three closely overlapping buried soils.The contents of La, Ce, Nd, Sm, Eu, Tb, Dy, Tm, Yb and Lu in soils were determined by instrumental neutron activation analysis (INAA),and the contents of other elements by chemical method. The results showed that the total REE contents of the 20 samples ranged from 157 to 231.68 ppm with au average of 199 ppm, which is close to the contents in shales of north America. The REE contents in various developed horizons of the loess profile were different, but they tended to be, approximately identical after having eliminated the interference of CaCO3. It seems that the CaCO3 played a diluent role in various layers.The loess is continental deposits generally rich in the elements of Ce family, with,imilar REE distribution patterns and no remarkable segreaatian in various layers. All these indicate that the loess either in its oribinal region or in the accumulated region has been under dry and asriated conditions since long before, which inevitably results in its weak eluviation process.

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汪夕彬,田均良,戚天庆,刘普灵,宋才炽,李雅琦.陕西扶风新集黄土剖面中的稀土元素[J].土壤学报,1986,23(1):44-49. Wang Xibing, Tian Junliang, Qi Tianqing, Liu Puliang, Song Caizhi, Li Yaqi. RARE EARTH ELEMENTS IN TOP SOIL AND BURIED SOILS OF XINJI LOESS PROFILE IN SHAANXI PROVINCE[J]. Acta Pedologica Sinica,1986,23(1):44-49.

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  • 在线发布日期: 2013-02-25
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