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本文用电感耦合等离子体原子发射光谱法(ICP—AES)测量了从中太平洋北部海底采集的锰结核样品的元素组成并用铀系测年法测定了它们的生长速率,结果表明,锰结核中元素的深度分布有随深度增加、减少和起伏不定三种特征,这些锰结核内部的元素组成的变化,一般被认为是由于锰结核中元素的扩散和迁移以及锰结核的不均匀性所致。 本文用扩散模型解释了锰结核中元素含量向内增加的分布,据此模型计算,锰结核中Ni、V和Zn的有效扩散系数为10~(-9)cm~2/a数量级——小于对放射性核素所报道的数值。
In this paper, ICP-AES was used to measure the elemental composition of manganese nodules sampled from the seabed of the northern part of the Central Pacific and their growth rates were determined by uranium dating. The results show that the elemental composition of manganese nodules The depth distribution is characterized by three factors: increasing, decreasing and fluctuating with depth. The change of elemental composition in these manganese nodules is generally considered to be due to the diffusion and migration of elements in manganese nodules and the nonuniformity of manganese nodules. Based on this model, the effective diffusion coefficients of Ni, V and Zn in Mn nodules are in the order of 10-9 cm 2 / a, less than The values reported for radionuclides.