鞍山市铁矿区土壤稀土元素的地球化学特征

Geochemical Characteristics of Rare-Earth Elements in the Soils around Iron Mine Regions of Anshan

为探明鞍山铁矿区土壤稀土元素地球化学背景,以鞍山市铁矿区土壤为研究对象,从稀土元素的全量特征和分馏特征两方面进行了系统研究。结果表明:齐大山区和大孤山区土壤稀土元素总量均值分别为195.50 mg/kg和278.57 mg/kg,均高于中国大陆土壤中稀土元素的含量(187.60 mg/kg);大孤山区∑REE平均含量明显高于齐大山区,并且每项稀土元素的含量都高于齐大山区;2区内ΣCe/ΣY值均>1,分馏比值(La/Yb)N>(La/Sm)N>(Gd/Yb)N,δEu<1,δCe接近1;土壤中稀土元素含量遵循奥多—哈金斯法则,含量分布基本保持一致,土壤中轻重稀土元素分馏明显,呈现轻稀土元素相对富集;Ce元素无异常,Eu元素亏损。

A systematic study from total analysis and fractionation characteristics were conducted to identify the geochemical characteristics of the soils at iron mine region in Anshan. The results indicated that the mean content of soil rare-earth elements of Qidashan and Dagushan were 195.50 mg/kg and 278.57 mg/kg,respectively. The value of ∑ REE and each item of rare earth elements content in Dagushan were higher than Qidashan. In the two regions the value of ∑Ce/∑Y was higher than 1, （ La/ Yb）N 〉 （La/Sm）N 〉 （Gd/Yb）N,δEu value was lower than 1 ,δCe value was near 1. The content of REE followed the Oddo-Harkin rule strictly. LREE and HREE separated obviously, showing LREE relative enrichment. Ce showed no anomaly and Eu showed negative anomaly.