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富钴结壳的矿物学研究是一个难点。本文运用电子探针微区分析结合X射线衍射和矿相显微镜观察的综合方法对富钴结壳中的铁锰氧化物矿物组合及其组分变化进行了研究。研究发现 ,富钴结壳是从与胶状粘土类混合共沉积开始生长的 ,结壳内部的韵律层和柱状构造也是始于粘土层终于粘土层的 ;铁锰团粒的核心一般是较纯的水羟锰矿小核心 ,可能是在生物媒介作用下在水体中形成后沉降叠积的。FM、FPE海山结壳的中层存在一较纯水羟锰矿层 ,但该层中Co含量FM1 5比FPE0 6低得多 ,可能反映了FM1 5在该层形成时Co通量较低。而该层在FN1 2中不存在 ,反映了区域环境的较大差异。在FN1 2火焰状构造亚带存在Mn氧化物和Fe氧化物的极度分异现象 ,可能反映了结壳形成环境的重大变化。
The mineralogy of cobalt-rich crusts is a difficult task. In this paper, the combination of Fe-Mn oxide minerals in cobalt-rich crusts and their compositional changes were studied by the combination of electron probe microanalysis and X-ray diffraction and optical microscope observation. It is found that the cobalt-rich crust is grown from mixed co-deposition with colloidal clays, and the rhythm and columnar structures inside the crust also start from the later clay layer. The core of ferromanganese pellets is generally purer Hydroxymanganese small core, may be formed under the action of biological media in the water after the sedimentation accumulation. However, the content of Co1 in this layer is much lower than that of FPE0 6, which may reflect the low Co flux of FM1 5 in the formation of this layer. This layer does not exist in FN1 2, reflecting the large differences in regional environment. The extreme differentiation of Mn oxides and Fe oxides in the flame-like structural subbands of FN1 2 probably reflects the significant changes in the crust formation environment.