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用ICP-Ms法对中太平洋海山6个站位的16个结核样品作了常量元素、微量元素和稀土元素分析,采用碱熔Te共沉淀预富集和同位素稀释法测定了其中部分样品的铂族元素含量.用X射线衍射法测定了样品的矿物组成.结果显示,中太平洋海山结核的矿物组成和化学成分,以及主要组分的赋存状态均与水成海山富钻结壳十分接近,表明样品是水成成因的产物.与深海结核相比,海山结核有明显富Fe和Co,贫Cu和Ni的特征.中太平洋海山结核可能形成于海山沉积物表面的弱酸性、强氧化环境中.与富钴结壳相似的产出水深和氧化还原条件是决定海山结核化学成分、矿物成分和元素赋存状态的主要因素;但因其产出于沉积物-海水界面,经受了沉积物早期成岩作用的影响,从而较典型的海山结壳略具向深海结核过渡的特征。
The ICP-MS method was used for the determination of 16 elements in the six stations of the Central Pacific Seamount. The elemental, trace elements and rare earth elements were analyzed. Pretreatment with alkali-melt Te co-precipitation and isotope dilution The results show that the mineral composition and chemical composition of the seamount in the Central Pacific Ocean and the occurrence of the major components are both close to those of the Shuichang Haishan diamond-rich crust, Indicating that the sample is the product of the cause of aqua.Compared with deep-sea tuberculosis, seamount tuberculosis has the characteristics of rich Fe and Co, poor Cu and Ni.Central Pacific seamounts tuberculosis may form in the weak acidic and strong oxidizing environment on seamount sediments Similar to the cobalt-rich crust, the water depth and the redox conditions are the main factors that determine the chemical composition, mineral composition and elemental abundance of seamounts, but they are exposed to sediment-seawater interface due to their early deposition Diagenesis, which is more characteristic of the transition from the typical seamount to the deep-sea tuberculosis.