Manganese recycling in coastal waters
Manganese recycling in coastal waters
复制标题
沿海水域锰回收
DOI：
10.1016/0304-4203(79)90031-8
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发表时间：
1979
期刊：
影响因子：
3
通讯作者：
J. M. Bewers
中科院分区：
文献类型：
--
作者：
P. Yeats;B. Sundby;J. M. Bewers
圣劳伦斯湾深水中的水和悬浮颗粒物都富含锰。最高溶解锰浓度出现在接近沉积物-水界面处，而锰含量最高的颗粒物质出现在海底以上30-100米处。浓度升高是由于溶解锰从底层细粒沉积物中的成岩释放及其随后在水柱中的沉淀。锰沉淀的速度比扩散和混合的速度快。部分富锰颗粒物通过平流和扩散在整个水柱中混合。因此，富含锰的颗粒最终会被主流洋流带入公海。这一过程，这似乎是广泛的加拿大东部沿海沃茨，使锰最初与快速沉降的陆源颗粒转移到缓慢沉降的细粒悬浮颗粒进入海洋从沿海环境。这样，陆源锰的河流可能占远洋沉积物中过量锰的主要比例。
Both water and suspended particulate matter in the deep water of the Gulf of St. Lawrence are greatly enriched in manganese. Maximum dissolved manganese concentrations are encountered close to the sediment-water interface whereas the particulate matter with highest manganese content occurs 30–100 m above the bottom. The elevated concentrations are attributed to the diagenetic release of dissolved manganese from the underlying fine-grained sediments and its subsequent precipitation in the water column. The rate of manganese precipitation is rapid compared to the rates of diffusion and mixing in the bottom water. Part of the manganese-enriched particulate matter becomes mixed throughout the water column by advection and diffusion. Thus, particles enriched in manganese can ultimately be carried into the open ocean by prevailing currents. This process, which appears to be widespread in eastern Canadian coastal waters, enables manganese originally associated with rapidly settling terrigenous particles to be transferred to slowly settling fine-grained suspended particles entering the ocean from coastal environments. In this way, riverborne manganese of terrigenous origin may well account for a major proportion of the excess manganese in pelagic sediments.