Rare earth element patterns in lake sediments as studied by neutron activation analysis
Rare earth element patterns in lake sediments as studied by neutron activation analysis
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DOI：
10.1023/b:jrnc.0000011747.05704.63
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发表时间：
2003-12
影响因子：
1.6
通讯作者：
S. M. B. D. Oliveira;F. E. Larizzatti;D. I. Fávaro;S. R. D. Moreira;B. Mazzilli;E. Piovano
中科院分区：
文献类型：
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作者：
S. M. B. D. Oliveira;F. E. Larizzatti;D. I. Fávaro;S. R. D. Moreira;B. Mazzilli;E. Piovano
用仪器中子活化分析法测定了阿根廷拉古纳玛奇基塔3个沉积岩芯中La、Ce、Nd、Sm、Eu、Tb、Yb和Lu的垂直分布。使用Soil 7（IAEA）参考材料进行方法验证。稀土元素含量因岩芯位置和岩性单元而异，取决于河流陆源组分在湖泊沉积物中所占的比例。陆源成分含量高的岩性，稀土元素含量高，表明稀土元素的主要载体相可能是碎屑矿物，（La/Yb）N和（LREE/HREE）N比值均在1.2左右，表明相对于平均页岩NASC，LREE略有富集。Ce/Ce* 值接近1.0，这意味着Ce的行为类似于其他轻稀土元素。
Using instrumental neutron activation analysis, the vertical distribution of La, Ce, Nd, Sm, Eu, Tb, Yb and Lu was determined in 3 well dated sedimentary cores collected from Laguna Mar Chiquita, Argentina. Validation of the methodology was done using the Soil 7 (IAEA) reference material. The REE contents vary according to core location and lithological units, depending on the proportion of fluvial terrigenous components in the lake sediments. Lithologies with higher proportion of terrigenous components show higher REE concentrations, suggesting that the dominant REE carrier phase might be a detrital mineral. There is a consistent value of about 1.2 for (La/Yb)Nand (LREE/HREE)Nratios for all sediments at the three sites, indicating a slight LREE enrichment in relation to the average shale NASC. Ce/Ce* values are close to 1.0, meaning that Ce behaves similarly to other light REE's.