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报道了中国南海北部海区海底沉积物中孔隙水的Cl-和SO42-质量浓度的变化特征, 圈定了孔隙水中Cl-质量浓度的高值异常区。由于水合物形成过程中的排盐效应, 会使其上覆浅表层沉积物中孔隙水的盐度增高, 因此这些氯离子的高值异常区值得进一步的勘查。对孔隙水中SO42-的质量浓度分析表明, 研究区的一些站位表现出随深度增加SO42-的质量浓度梯度发生明显的变化, 计算的硫酸盐甲烷交接带SMI界面深度均在 10m左右, 与ODP164航次和ODP204航次有天然气水合物的钻孔的SMI界面深度基本吻合, 说明这些站位深部有天然气水合物存在的可能性。
The characteristics of Cl- and SO42- concentrations in pore water in the sediments of the northern South China Sea are reported, and the high-value anomalous zone of Cl- mass concentration in pore water is delineated. Because of the salinization effect of hydrate formation, the salinity of pore water in superficial surface sediments will increase, so the high anomalies of these chloride ions deserve further exploration. The mass concentration analysis of SO42- in pore water shows that some sites in the study area show a significant change in the mass concentration gradient of SO42- with increasing depth. The calculated depth of the SMI interface in the sulfate methane cross section is about 10m, The depth of the SMI interface between the voyage and the drilling of gas hydrate in ODP204 voyage basically coincide with each other, indicating the possibility of gas hydrate deep in these stations.