导　　师： 李安春

学科专业： 070704

授予学位： 硕士

作　　者： ;

机构地区： 中国科学院研究生院

摘　　要： 本文基于北黄海1140个表层沉积物样品的粒度分析结果,来探讨沉积物粒度组成、分布特征与物源和水动力环境的关系。结果表明,研究区底质类型主要有泥、粉砂、砂质粉砂、粉砂质砂、砂五种类型,少数站位含有砾石。砾石则主要分布在长山列岛附近海域、大连湾口及其东南近海;砂主要分布在123.3°E以东的海域和长山列岛附近海域;粉砂主要分布在研究区的西南部和大连湾外海;粘土的含量较低,含量大于30/%的区域仅分布在研究区的西南部,大于16/%的区域有向北和东北延伸的趋势,在大连湾至广鹿岛近海沉积物粘土含量也大于16/%。 根据对沉积物粒度各粒级的因子分析结果,结合沉积物的Folk分类和Pejrup分类,将北黄海划分成五个主要沉积环境分区,分别受山东半岛沿岸流、黄海暖流、强潮流场、长山列岛和辽东沿岸流控制。北黄海中西部沉积物主要受山东半岛沿岸流影响,经过本区的黄海暖流限制了山东半岛沿岸流携带的细粒物质向东和向北的扩散和运移,研究区东部沉积作用的主控因素是潮流,长山列岛中部海域受附近岛屿剥蚀物影响,大连湾外海受辽东半岛沿岸流控制。研究区西南部细粒沉积物的粒度分布具有不均匀性和南北不对称性,其形成主要受控于山东半岛沿岸流和黄海暖流及其相互作用,潮流可能也起一定作用。 Grain size of the 1140 surface sediment samples were analyzed in order f to probe into the relationship between the characteristics of grain size distribution and the sediment source or sedimentary dynamic conditions in the North Yellow Sea.The results indicate that the surface sediments in the study area can be divided into five types including mud , silt,sandy silt ,silty sand and sand,some of the samples contain gravels. Sediments with gravels mainly distribute near Changshan Islands, off Dalian Bay and adjacent area southeast. Sandy sediments dominate east of 123.3°E and near Changshan Islands.Silt is mostly located southwest of the study area and off Dalian Bay. Clay content is lower in study area. The area with more than 30/% of clay content is confined southwestern locality,while area with more than 16/% of clay content extends to north and northeast. Besides, the clay content is also more than 16/% from Dalian Bay to Guanlu Island. The study area can be divided into five sediment environmental zones according to Folk and Pejrup’s sediment classification methods and factor analysis to the sediment grain size, three of which are controlled by the environmental hydrodynamics and the others effected by the sediment sources. The Yellow Sea Warm Current restricts eastward transport of the fine-grade matter brought by the Shandong Peninsula coastal current. The main factor controlling the grain size characters is the tide in the eastern part of the study area and is the Shandong Peninsula coastal current in the western part. The grain size distribution of the fine sediments in the western study area is asymmetrical, and it is effected by the Shandong Peninsula coastal current, the Yellow Sea Warm Current and the tide.

关 键 词： 表层沉积物 粒度 因子分析 沉积环境 北黄海

分 类 号： [P736.21]

领　　域： [天文地球] [天文地球]