Composition of ferromanganese crusts from the central Sea of Okhotsk

Fine mineral grains of nonferrous and precious metals (Ag, Au, Cu, Ni, Pb, Sn, Zn, Sb, Ti, W, Mo, and Ce) were revealed for the first time by SEM and microprobe studies of polished sections of iron-manganese crusts from the Sea of Okhotsk. The metals form native and intermetallic compounds; less frequently they form mineral oxides or sulfides. A conclusion was drawn that the main part of the native minerals represents mechanical admixture in the ferromanganese crusts.本次研究首次通过扫描电子显微镜（Scanning Electron Microscope，SEM）与微探针分析，对鄂霍次克海铁锰结壳的抛光切片开展观测，发现了有色金属与贵金属（银Ag、金Au、铜Cu、镍Ni、铅Pb、锡Sn、锌Zn、锑Sb、钛Ti、钨W、钼Mo以及铈Ce）的微细矿物颗粒。这些金属以自然金属及金属间化合物的形式赋存，少数情况下以矿物氧化物或硫化物形式产出。研究得出结论：该类自然矿物的主体部分属于铁锰结壳中的机械混入物。