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为研究沉积作用和沉积环境,采用压榨法于渤海湾13个柱样中获取了55个层次的间隙水。测定了间隙水的主要盐类成分以及沉积物交换容量和交换性阳离子。结果表明:间隙水的主要盐类成分高于其上覆底层海水,但仍属于现代海水;存在微弱的硫酸盐还原作用;Ca~(2+)、Mg~(2+)由液相转入固相,K~+、Na~+由固相转入液相,阳离子在固—液相平衡中的交换次序为K~+>Na~+>Mg~(2+)>Ca~(2+)。同时,从三个柱样间隙水的含盐度(>40‰)看出,海盆当时的沉积环境是蒸发量远大于淡水流入量。
To study sedimentation and depositional environment, 55 levels of interstitial water were obtained from 13 columns in the Bohai Bay using the squeezing method. The main salt components of interstitial water as well as sediment exchange capacity and exchangeable cations were determined. The results showed that the main salt components of interstitial water were higher than those of the overlying seawater, but still belonged to the modern seawater. There was faint sulfate reduction. Ca ~ (2 +) and Mg ~ (2+) The solid phase, K ~ +, Na ~ + are transferred from the solid phase to the liquid phase. The exchange order of the cation in the solid-liquid equilibrium is K ~ +> Na ~ +> Mg ~ (2 +)> Ca ~ (2+ ). At the same time, from the salinity of the three column-like interstitial water (> 40 ‰), the sedimentary environment of the basin was much larger than the inflow of fresh water.