稀土元素及钇在东太平洋CC区深海泥中的富集特征与机制  

Enrichment mechanism of rare earth elements and yttrium in deep-sea mud of Clarion-Clipperton Region

作　　者：任江波[1,2] 姚会强[1,2] 朱克超[1,2] 何高文[1,2] 邓希光[1,2] 王海峰[1,2] 刘纪勇[1,2] 傅飘儿[1,2] 杨胜雄[1,2] 

机构地区：[1]国土资源部海底矿产资源重点实验室 [2]广州海洋地质调查局,广东广州510075

出　　处：《地学前缘》2015年第4期200-211,共12页Earth Science Frontiers

基　　金：中国地质调查局项目(GZH201100303);国土资源部海底矿产资源重点实验室开放基金课题(KLMMR-2013-A-05);国际海域资源调查与开发"十二五"课题(DY125-14-R-01)

摘　　要：东太平洋CC区深海泥具有高的REY（REE＋Y）含量,理解其富集机制对于寻找深海稀土资源具有重要意义。本文对WPC1101站位的沉积物柱状样开展了沉积物类型、粒度、黏土矿物和元素组成分析,结合已有资料探讨研究区深海泥的稀土元素富集特征及其形成机制。研究区深海泥主要以远洋黏土和硅质生物组分为主,其∑REY范围主要为400-1 000μg/g。深海泥北美页岩标准化后的REY配分模式具有显著的负Ce异常,指示富稀土深海泥中海相自生组分贡献较大。根据统计发现,研究区深海泥的∑REY与Al2O3、MnO、P2O5均具有良好的相关性,黏土组分、铁锰氧化物和磷酸盐对REY都有贡献。通过综合分析,提出研究区富稀土泥中高P含量是高∑REY重要的控制因素。The deep-sea mud in Clarion-Clipperton region （CC Zones）, East Pacific Ocean have a high content of rare earth elements and yttrium （REY）. Understanding the REY enrichment mechanism in pelagic sediments is important for seeking deep-sea REY resources. In this paper, samples from piston core WPCll01 station are investigated with high-resolution analysis of the sediment type, particle size, clay minerals and geochemistry. Combined with the results of previous studies and information, this study was to investigate the characteristics and enrichment mechanism of REY in deep-sea mud. The samples from the study area mainly contain pelagic clay and siliceous biological components, with ∑REY content mainly between 400 ppm to 1000 ppm. NASC-normalized REY patterns of mud samples from CC Zones display significant negative Ce anomalies, indicating that the authigenic sediments have a major contribution to the REY. According to geochemical statistics, ∑REY has good correlation with Al2O3, MnO and P2O5. REY in the deep-sea mud were carried by clay fractions, iron oxides, manganese oxides and phosphates, while the REY fractions in these substances are different for different situations. According to the comprehensive analysis, we proposed that the deep-sea mud from CC Zones with high P content has major contribution to the high REY content.

关 键 词：稀土元素 磷酸盐 深海泥 多金属结核 CC区 

分 类 号：P736.4[天文地球—海洋地质]