海洋软泥水成矿金属组分存在形式及其溶解—沉淀的定量研究  

QUANTITATIVE ESTIMATION ON THE EXISTING FORM OF ORE-FORMING METAL SPECIES AND ITS SOLUTION- PRECIPITATION OF THE OOZE WATER IN OCEAN

作　　者：吴琳[1] 汪珊[2] 张宏达[1] 郭振中[1] 

机构地区：[1]中国地质大学 [2]中国地质科学院水文地质环境地质研究所,河北正定050803

出　　处：《海洋地质与第四纪地质》2004年第2期49-53,共5页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目(49902021)

摘　　要：依据溶液化学平衡反应模型理论,对海盆和洋盆软泥水的成矿金属组分存在形式及其溶解-沉淀作用进行了定量研究,结果表明,软泥水中除Fe存在部分高价态外,Mn、Cu、Ni、Co均以低价态的形式存在,它们不可能通过化学沉淀作用生成以高价态锰矿物为主的结核。实验证明Mn、Fe主要以胶体和微粒形态存在,其浓度比溶解态的浓度要高出百倍至千倍。这些胶状的金属微粒直接参与了结核的生成。胶体化学作用是结核生成的主要成矿作用。The quantitative estimation presents the individual characteristics of the existing form of the ore-forming metal species and their solution-precipitation of the ooze water in the South China Sea and the East Pacific Ocean by means of the geochemical equilibrium model. The results show that the other forms of Mn, Cu, Ni and Co species are in low valence except that Fe is in high valence in the ooze water of the ocean. However, they cannot form the high valence Mn-dominated nodule by chemical precipitation. The experiments indicate that the Mn and Fe exist as the colloid and particle form in the water, whose concentrations are hundreds to thousands times higher than those of dissolved Mn and Fe,and the colloform metals directly take part in the formation of nodules.So the colloidal chemical action is the dominant nodule-forming process.

关 键 词：地球化学模拟 海洋软泥水 成矿金属组分 溶解沉淀作用 海洋地质学 海洋化学 

分 类 号：P736.4[天文地球—海洋地质]