约翰斯顿岛附近海山富钴锰结壳的元素组成及地球化学特征  

Element Composition and Geochemical Characteristics of Co-rich Mn-crust from Johnston Island

作　　者：王晓红[1] 滕云业[2] 潘家华[3] 王毅民[1] 

机构地区：[1]中国地质科学院岩矿测试技术研究所 [2]广州海洋地质调查局实验室 [3]中国地质科学院矿产资源研究所

出　　处：《地球学报（中国地质科学院院报）》2000年第3期282-286,共5页Acta Geoscientia Sinica

基　　金：国家专项"大洋矿产资源研究开发"资助!(DY95 0 5 0 9)

摘　　要：采用波长色散X射线荧光光谱 (WDXRF)、电感耦合等离子体光谱 (ICP AES)、电感耦合等离子体质谱 (ICP MS)、原子荧光光谱 (AF)和化学等多种现代化分析技术 ,研究测定了我国“海洋四号”船 1987年采自约翰斯顿岛附近海山上的富钴锰结壳样品化学组成 ;获得了主、次和痕量 (包括全部稀土元素REE)共 52个组分的含量 ,并以地壳元素丰度的新数据计算了各元素的富集因数ef(enrichmentfactor)。与大洋多金属结核相比 ,该结壳样的主要地球化学特征是 :Co和Pt的质量分数较高 (分别达 1.2 %和 0 .37× 10 - 6) ,为结壳资源中最具经济价值的元素 ;Si、Al等造岩元素含量较低 ;稀土元素具有较高的质量分数 ,其w(ΣREE) >0 .15% ,从而引起不少研究者的注目 ;富集系数在 4 0 0以上的元素除Co、Pt和Mn外 ,还有Mo、Tl和Bi等痕量元素 ,这些元素很可能成为结壳成因和海洋环境研究的重要示踪剂。A sea mountain Co_rich manganese crust sample taken from the Johnston Island by HY4 in 1987 was analyzed by several advanced techniquas such as XRF, ICP AES, ICP MS,and AF as well as some chemical methods;as a result,the contents of the total 52 major, minor and trace elements(including all rare earth elements) have been determined.In addition,the authors calculated the enrichment factor of each element according to the new element abundance data of the earth's crust. Compared with the marine polymetallic nodule,the crust sample has the following geochemical characteristics:the contents of Co and Pt are relatively high(1.2% and 0.37μg/g respectively) and become the most important elements in the crust resource; the contents of the rock forming elements such as Si andj Al are rather low,but the contents of REE are comparatively high(ΣREE>0.15%).These phenomena have attracted many scientists'attention.Besides Mn,Co and Pt,the efs values of several elements such as Mo,Tl and Bi exceed 400 too and these elements can be used as the tracers to study the genesis of the crust and the marine environment.

关 键 词：富钴锰结壳 化学组成 约翰斯顿岛 海山 地球化学 

分 类 号：P736.4[天文地球—海洋地质]