黄、东海海域水团发育对底质沉积物分布的影响

INFLUENCE OF WATER MASSES ON THE DISTRIBUTION OF SEA-FLOOR SEDIMENTS IN THE HUANGHAI SEA AND THE EAST CHINA SEA

通过对黄、东海海域底质沉积物中的细粒级粘土矿物组合特征和全粒级碳酸盐含量分析、对比上覆水团和悬浮体资料，探讨研究区水团发育消长对底质沉积物分布的影响作用。结果表明研究区可以划分为长江冲淡水影响的长江型物质沉积区；黄海水影响的黄河型物质沉积区和黑潮水以及东海次表层水影响的残留型物质沉积区。而水团发育消长可直接影响下伏底质的分布特征。黄河型物质沉积区与残留型物质沉积区的分界相应于黄海冷水向东南扩展与黑潮次中层混合水向陆架爬升互为消长的长期综合平衡位置，而黄海冷水向东南的扩展范围代表着黄河物质在陆架向东南扩展沉积的最大范围．

The characteristics of fine-grained clay mineral composition and content of carbonate of sea-floor sediments in the Huanghai Sea and East China Sea were studied by using X-ray diffraction (XRD) and chemical analyses. The results show that the distribution of sea-floor sediments has a good relation with water masses, especially the middle and bottom water masses in the study area. According to the distribution of the clay mineral composition and the content of carbonate, the study area can be divided into three sub-sedimentary areas, namely, the Changjiang River Form Material Sedimentary Area mainly affected by the Changjiang River Diluted Water, the Huanghe River Form Material Sedimentary Area mainly affected by the Huanghai Sea Coast Water and Huanghai Sea Cold Water, and the Relict Form Material Sedimentary Area mainly affected by the Kuroshio Water and the East China Sea Subsurface Water. The boundary between the Huanghe River Form Material Sedimentary Area and the Relict Form Material Sedimentary Area corresponds to the dynamic equilibrium area resulting from the interaction between the Huanghai Sea Cold Water diffusing towards the southeast and the Climbing Kuroshio Water moving towards the shelf, which suggests that the most southeast diffusion area of the Huanghai Sea Cold Water represents the largest sedimentary area towards the southeast of the Huanghe River Form Materials in the study area.