太平洋中部富REY深海沉积物的地球化学特征及化学分类

发布时间：2018-08-28 20:01

【摘要】：赋存于深海沉积物中的稀土资源是一种潜在的稀土资源。对太平洋中部30个重力活塞柱状样中的1 275个深海沉积物样品的常量、稀土化学分析数据进行了系统研究。在涂片鉴定的基础上,采用Ca O和Al2O3含量把太平洋中部深海沉积物划分为钙质软泥类沉积物、硅质软泥类沉积物、深海黏土类沉积物三种成因类型;这三种类型沉积物的稀土分布模式相似,表现为明显的Ce负异常,一定程度的重稀土元素富集和Y正异常,深海黏土类沉积物的ΣREY明显偏高。采用主要元素(包括Ca O/P2O5比值)与REY的关系图可以有效地判别不同成因类型沉积物的混合状况。太平洋中部富P、富含沸石的深海黏土类沉积物是最有利的富REY的深海沉积物类型。太平洋中部深海沉积物REY富集的主要原因是由于深海沉积物中混入了过量的(鱼牙骨碎屑状)磷灰石组分,而钙质生物组分和硅质生物组分的加入对REY含量起了明显的稀释作用。
[Abstract]:Rare earth resources existing in deep sea sediments are a potential rare earth resource. The chemical analysis data of rare earth elements in 1,275 deep-sea sediment samples from 30 gravity piston columnar samples in the central Pacific Ocean were systematically studied. On the basis of smear identification, the deep-sea sediments in the middle of the Pacific Ocean are divided into three genetic types by Ca O and Al2O3 contents: calcareous silt sediments, siliceous silt sediments and deep-sea clay sediments. The REE distribution patterns of these three types of sediments are similar, showing obvious negative Ce anomalies, enrichment of heavy rare earth elements and positive Y anomalies to some extent, and high 危 REY of deep sea clay sediments. The relationship between the main elements (including Ca O/P2O5 ratio) and REY can be used to identify the mixing conditions of different genetic types of sediments. P- rich and zeolite-rich deep-sea clay sediments in the central Pacific are the most favorable deep-sea sediments rich in REY. The main reason for the enrichment of REY in deep-sea sediments in the central Pacific Ocean is due to the excessive concentration of apatite in deep-sea sediments. The content of REY was diluted by the addition of calcium and siliceous components.
【作者单位】：广州海洋地质调查局;
【基金】：中国地质调查局大洋调查与研究项目(编号:GZH201100303-05)资助
【分类号】：P744;P736.2

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