渤海及邻近海区表层沉积物粒度组成及沉积分区

发布时间：2018-10-25 17:31

【摘要】：通过渤海及邻域海区表层沉积物粒度实测数据,采用Folk三角图解分类方法,对比已有Shepard分类沉积物类型图对近岸的沉积物类型进行相应补充,编制沉积物类型图,并进行沉积分区。沉积物类型主要为砂质粉砂、粉砂质砂、砂质泥、泥质砂、粉砂和砂。根据沉积物类型分布特征、海洋环流、地形地貌及物质来源(入海河流物质影响程度),划分为4个沉积区,分别是辽东湾混合沉积区、渤海湾-莱州湾及周边泥质沉积区、老铁山水道-辽东-渤中浅滩砂质沉积区和北黄海西部泥质沉积区。渤海表层沉积物的分布受控于近源河流物质和海洋环流变化。渤海的潮流场控制泥沙输运,弱潮流区对应细颗粒沉积物沉降,强潮流控制区发育粗粒级潮流沙脊和沙席沉积。
[Abstract]:Based on the measured data of surface sediment grain size in Bohai Sea and adjacent sea area, the Folk triangulation classification method is used to compare the existing Shepard classification sediment type maps to supplement the coastal sediment types, and to compile the sediment type maps. And depositional zoning is carried out. Sediment types are mainly sandy silt, silty sand, sandy mud, muddy sand, silty sand and sand. According to the distribution characteristics of sediment types, ocean circulation, topography and geomorphology, and material source (influence degree of river material entering the sea), it can be divided into 4 sedimentary areas, namely the mixed sedimentary area of Liaodong Bay, the Bohai Bay-Laizhou Bay and the surrounding muddy sedimentary area. Laotieshan waterway-Liaodong-Bozhong shoal sandy sedimentary area and northern Huang Hai western muddy sedimentary area. The distribution of surface sediments in the Bohai Sea is controlled by changes in near-source river material and ocean circulation. The tidal current field in Bohai Sea controls sediment transport, the weak tidal current area corresponds to fine grain sediment sedimentation, and the strong tidal current control area develops coarse grain tidal current ridge and sand sheet deposition.
【作者单位】：海洋科学与技术国家实验室中国地质调查局青岛海洋地质研究所;国土资源部油气资源和环境地质重点实验室中国地质调查局青岛海洋地质研究所;
【基金】：国家自然科学基金项目(41206053) 中国地质调查局国土资源大调查项目(GZH200800501、GZH201400201、DD20160137) “大陆架科学钻探”项目(GZH201100202)
【分类号】：P736.21

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