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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。
According to the voyage survey from November to December 1993, the distribution and transfer of iron and manganese in the sediment / interstitial water / seawater in the Nansha Sea were studied. The results show that the content of Fe in the sediments is similar to that of other sea areas. Mn has the obvious characteristics that not only the content is very high, but also the difference at different stations, and the separation between Fe and Mn exists. Sediment Fe, Mn content and water depth was positively correlated. It is estimated that there is manganese in our area. In the interstitial water Fe, Mn were significantly enriched, 30 times higher than the seawater content. The interface distribution and transfer of Fe and Mn (especially Mn) are closely related to water depth, and are also related to the redox conditions of sediments.