| 太平洋中部富REY深海沉积物的地球化学特征及化学分类 |
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| 引用本文：朱克超,任江波,王海峰.2016.太平洋中部富REY深海沉积物的地球化学特征及化学分类[J].地球学报,37(3):287-293. |
| DOI：10.3975/cagsb.2016.03.04 |
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| 基金项目:中国地质调查局大洋调查与研究项目(编号: GZH201100303-05) |
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| 中文摘要: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CaO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CaO/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。 |
| 中文关键词:太平洋中部 富REY深海深海沉积物 磷灰石 深海沉积物分类 |
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| Geochemical Characteristics and Chemical Classification of REY-rich Pelagic Sediments from the Central Pacific Ocean |
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| Abstract:REE resource preserved in deep sea sediments is a kind of latent REE resource. Major element and rare earth element analysis of 1 275 pelagic sediment samples from 30 piston cores in the central Pacific was conducted in this study. The pelagic sediments from the central Pacific can be divided into three genetic types, that is, calcareous oozes sediments, siliceous oozes sediments and pelagic clay sediments by the content of CaO and Al2O3 based on the slice observation, which have similar REE distributions characterized by clear Ce negative anomaly and some HREE enrichment as well as Y positive anomaly, and the pelagic clay sediments generally have higher ΣREY. The diagram of the content of main elements (including CaO/P2O5) versus REY of the pelagic sediments can be used to distinguish the mixing state of different genetic component effectively. The pelagic clay sediments with high P and phillipsite content from the central Pacific are the most favorable REY-rich pelagic sediments. The REY enrichment of pelagic sediments from the central Pacific is mainly caused by excessive apatite components with fish teeth bone debris shape mixed in the pelagic sediments, and the admixture of the calcareous biologic and siliceous components have the dilute effect on the content of REY of the pelagic sediments. |
| keywords:central Pacific REY-rich pelagic sediment apatite classification of pelagic sediment |
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