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在水深2979、4310、8260米等三个不同深度的海底取样中,随着海水深度的增加,从金属元素的分布状态可以看到海底沉积物化学组成的变化趋势,从而得出一个结论,就是水深增大,沉积物中CaCO_3含量有减少的倾向.这是因为由方解石等碳酸钙矿物组成的生物碎片,因水深增加,受压力与水温变化的影响而溶解掉的缘故(lg.Berger,1967;Honjo,1975).由于碳酸钙矿物的溶解,其中所含的Ca与Sr等元素即溶于海水中而被排除,因此就可看出这些金属元素的浓度有随水深的增大而减少的倾向.但就Mn采说,越是在水深地点采集的样品Mu越富集.根据沉积圈闭实验,随深度增大,Mn、Cu、Fe之类金属元素在沉降过程中被粘土矿物颗粒所吸附量增多,因而沉积物中这些金属元素的含量就会变高(Brewer等,1980).
In the seabed sampling at three depths of 2979, 4310 and 8260 m, with the increase of seawater depth, the variation tendency of chemical composition of seabed sediment can be seen from the distribution of metal elements, and the conclusion is that As the water depth increases, the content of CaCO_3 in sediments tends to decrease, because biological fragments composed of calcium carbonate minerals such as calcite are dissolved due to the influence of pressure and water temperature due to the increase of water depth (lg.Berger, 1967 ; Honjo, 1975). Due to the dissolution of calcium carbonate minerals, the elements Ca and Sr contained therein are dissolved in seawater and are excluded, and therefore it can be seen that the concentration of these metal elements decreases as the water depth increases However, for Mn mining, the more Mu the samples collected in deeper water, the more enriched the samples.According to the sedimentary trap experiment, with the increase of depth, the metal elements such as Mn, Cu and Fe were precipitated by clay mineral particles The amount of adsorbed material increases and the content of these metal elements in sediments becomes higher (Brewer et al., 1980).