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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 variety of modern analytical techniques such as wavelength dispersive X-ray fluorescence (WDXRF), inductively coupled plasma (ICP AES), inductively coupled plasma mass spectrometry (ICP), atomic fluorescence spectroscopy (AF) The ship “Ocean IV” was a sample of cobalt-rich manganese crust samples taken from the seamount near Johnston Island in 1987; the total of 52 primary, minor and trace REEs (including all rare earth elements) The enrichment factor ef (enrichment factor) of each element was calculated based on the new data of elemental abundance of crust. The main geochemical characteristics of the crust-like samples compared with those of polymetallic nodules in the ocean are: the higher mass fractions of Co and Pt (1.2% and 0.37 × 10-6, respectively) are the most economical (Si, Al and other elements of rock-forming elements are low; rare earth elements have a higher mass fraction, the w (ΣREE)> 0.15%, which attracted the attention of many researchers; enrichment coefficient in 40 In addition to Co, Pt and Mn, trace elements such as Mo, Tl and Bi, elements above 0 are likely to become important tracers for the genesis and marine environment of crusts.