Barium in the Antarctic Ocean and implications regarding the marine geochemistry of Ba and226Ra
Barium in the Antarctic Ocean and implications regarding the marine geochemistry of Ba and226Ra
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DOI：
10.1016/0012-821x(73)90085-x
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发表时间：
1973-07
影响因子：
5.3
通讯作者：
Y. Li;T. Ku;G. Mathieu;K. Wolgemuth
中科院分区：
文献类型：
--
作者：
Y. Li;T. Ku;G. Mathieu;K. Wolgemuth
Ba在海洋中的分布与226 Ra的分布呈线性相关，反映了海洋生物对这两种元素的吸收分馏作用很小。226 Ra/Ba的质量比估计为（0.714 ± 0.08）× 10−8。不同海域硅质浮游生物的Ba/Si和Ra/Si值存在较大差异。这与观测结果相一致，尽管二氧化硅与Ba和226 Ra共同变化，但海水中的Ba/Si和226 Ra/Si比值在不同地区有所不同。沉积物孔隙水含有较高的Ba浓度比上覆海水。由此产生的Ba通过沉积物-海洋界面的扩散通量估计不超过20%的河流输入。相对于重晶石，孔隙流体中溶解的Ba的明显过饱和支持Ba与有机配体的络合可能是重要的这一想法。箱模型计算结果表明：（1）单位面积上，大陆架沉积物中226 Ra的通量大于深海底沉积物中226 Ra的通量;（2）在深海中，沉积物中226 Ra的扩散输入量与放射性衰变损失量相当。
Ba distribution in the ocean correlates linearly with that of226Ra, reflecting little fractionation of the two elements in their uptake by marine organisms. The weight ratio of226Ra/Ba is estimated to be (0.714 ± 0.08) × 10−8. A wide range of Ba/Si and Ra/Si values is noted in siliceous plankton collected from different oceans. This corraborates with the observations that, although silica co-varies with Ba and226Ra, the Ba/Si and226Ra/Si ratios in seawater vary from one area to another. Sediment pore water contains higher Ba concentrations than the overlying seawater. The resulting diffusive flux of Ba through the sediment-sea interface is estimated to be no more than 20% of the river input. The apparent oversaturation of dissolved Ba in pore fluids with respect to barite supports the idea that complexing of Ba with organic ligands may be important. Box model calculations show that: (1) on a per unit area basis,226Ra flux from the continental shelf sediments is higher than that from the deep sea floor; (2) in the deep ocean, the magnitude of diffusive input of226Ra from sediments is about equal to the loss due to radioactive decay.