南沙海域沉积物/海水界面分配与转移 Ⅱ.铁和锰

Distribution and transfer at sediment-seawater interface in sea area of Nansha Islands Ⅱ. Fe and Mn

根据１９９３年１１～１２月航次调查结果，研究南沙海域铁和锰在沉积物／间隙水／海水的界面分配和转移。结果表明，沉积物中Ｆｅ含量与其他海域差不多， Ｍｎ具有明显特色：不但含量很高，在不同站位差异悬殊，且 Ｆｅ、 Ｍｎ之间存在分离现象。沉积物中Ｆｅ、Ｍｎ含量与水深呈正相关。估计本海区有锰的微结核存在。在间隙水中Ｆｅ、Ｍｎ均产生明显富集，比海水含量高３０多倍。Ｆｅ、Ｍｎ（尤其是Ｍｎ）的界面分配和转移与水深密切相关，与沉积物的氧化还原条件也存在着一定关系。

based on the in-situ investigation results during the cruise in 1993 in the sea area of Nansha Islands, the distribution and transfer of Fe and Mn at interfaces among sediment. interstitial water and seawater have been studied. The following discoveries were made. (1) The contents of Fe and Mn in sediment are governed by water depth; (2) Mn content in sediment is high and differes significantly in different stations, Mn and Fe behave individually and negative relation between Mn contents exists in the sediment and intersitital water implying a possible occurence of micro-manganese concretion in some regions in that sea area; (3) Fe and Mn are highly accumulated in the interstitial water with similar distribution trend; (4) the distribution and transfer of Mn between sediment and intersititial water mainly depende on seawater depth and redox condition. The distribution and transfer of Fe and Mn between sediment and seawater is obviously governed by seawater depth.