| Luo Shangde,Wang Lei,Huang Yipu.Studies on diffusion and profiles of elements in deep-sea manganese nodules[J].Acta Oceanologica Sinica,1989,(3):391-400 |
| Studies on diffusion and profiles of elements in deep-sea manganese nodules |
| Studies on diffusion and profiles of elements in deep-sea manganese nodules |
| 投稿时间：1988-10-10 修订日期：1989-03-08 |
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| 中文摘要: |
| Elemental compositions are measured in manganese nodules collected from the Northern Mid-Pacific floor by inductively-coupled plasma atomic emission spectrometry (1CP-AES) and their growth rates are determined by radiometric methods.The result shows that depth distributions of elements in nodules vary with depth as follows; (ⅰ) increase, (ⅱ) decrease and (ⅲ) fluctuation.These internodule variations in elemental compositions are considered to be caused by diffusion and migration of elements in nodules and heterogeneities in textures of nodules.In the present paper, a diffusive model is used to elucidate the inward-increase profile of some elements in nodules.The effective diffusive coefficients are estimated to be of the order of 10-9 cm2/a for Ni, V and Zn in the nodules, which is less than the value reported for radionuclides. |
| 英文摘要: |
| Elemental compositions are measured in manganese nodules collected from the Northern Mid-Pacific floor by inductively-coupled plasma atomic emission spectrometry (1CP-AES) and their growth rates are determined by radiometric methods.The result shows that depth distributions of elements in nodules vary with depth as follows; (ⅰ) increase, (ⅱ) decrease and (ⅲ) fluctuation.These internodule variations in elemental compositions are considered to be caused by diffusion and migration of elements in nodules and heterogeneities in textures of nodules.In the present paper, a diffusive model is used to elucidate the inward-increase profile of some elements in nodules.The effective diffusive coefficients are estimated to be of the order of 10-9 cm2/a for Ni, V and Zn in the nodules, which is less than the value reported for radionuclides. |
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