辽东湾部分地区第四纪沉积物特点及沉积环境分析

发布时间：2019-03-01 18:43

【摘要】：一直以来,海洋学家都非常关注海洋第四纪的相关问题,特别是沉积物的特点和沉积环境的演变。锦州湾是位于辽东湾西侧的一个半封闭海湾,是我国海洋经济开发和发展的重点关注区域,也是中国对外开放战略的重要海域之一。探讨锦州湾内沉积物的沉积特征及其沉积环境,对于认识渤海具有非常重要的指导意义。本文主要以新构造运动学为基础,并以地貌学、地质年代学、地层学为指导、沉积动力学,以现代分析、测试技术为依托,采用综合分析法、比较分析法、数学地质一定量法,并充分利用已搜集的研究成果与资料,以及野外实地考察,对研究区的表层沉积样、钻孔样品建立平面图、剖面图、等值线图等,详细描述渤海辽东湾锦州湾附近海域第四纪沉积物的特点和沉积环境。研究区表层沉积物受多种类型因素的控制,类型主要是粉质粘土和淤泥质粘土,局部个别夹层含有粉砂。沉积物具有明显的亲陆性,判定研究区内沉积物主要来源于沿岸河流输入物质,此外沿岸岛屿的侵蚀、人类活动(凌源水库的修建)也提供了一定的物源。研究区内,无论是第四纪沉积物的粒度或是沉积厚度,反映在不同的钻孔中,沉积层序以及对应的特点都有差异,主要沉积物是淤泥、淤泥质粉质粘土、粉质粘土、粉细砂、粗砾砂和中砂,根据第四纪地层可划分为:全新统Q4(主要海相沉积层和海陆交互相沉积层)、晚更新统Q3(冲洪积相沉积层和海陆交互相沉积层)。总体观察沉积物在每一沉积层中在垂直上具有上细下粗的趋势。冰期时气候寒冷干燥,形成陆相地层,间冰期时气候温暖湿润,形成海相地层,冰期和间冰期之间形成了海陆交互沉积层。
[Abstract]:Oceanographers have always paid close attention to the Quaternary marine problems, especially the characteristics of sediments and the evolution of sedimentary environment. Jinzhou Bay is a semi-enclosed bay located on the western side of Liaodong Bay. It is the focus area of China's marine economic development and development, and is also one of the important sea areas of China's opening-up strategy. The study of sedimentary characteristics and sedimentary environment of sediments in Jinzhou Bay is of great significance for understanding the Bohai Sea. This paper is mainly based on neotectonic kinematics, guided by geomorphology, geochronology, stratigraphy, sedimentary dynamics, based on modern analysis and testing techniques, and adopts comprehensive analysis, comparative analysis, mathematical geological method, and so on. And make full use of the collected research results and data, as well as field investigation, to establish the surface sediment samples, borehole samples of the study area, plan, profile, contour map, etc. The characteristics and sedimentary environment of Quaternary sediments in Jinzhou Bay, Liaodong Bay, Bohai Sea are described in detail. The surface sediments in the study area are controlled by various types of factors, mainly silty clay and silty clay, and some individual interbeds contain silty sand. The sediment is obviously land-friendly. It is concluded that the sediment in the study area mainly comes from the input material from the coastal rivers. In addition, the erosion of the coastal islands and the human activities (the construction of Lingyuan Reservoir) also provide a certain source of material. In the study area, both the grain size and sediment thickness of Quaternary sediments are reflected in different drilling holes, the sedimentary sequence and the corresponding characteristics are different. The main sediments are silt, silty clay and silty sand. Coarse gravel sand and middle sand can be divided into Holocene Q4 (main marine sediments and marine-continental interbeds) and late Pleistocene Q3 (alluvial deposits and marine-continental intersections) according to the Quaternary strata. The trend of vertical thickness of sediment in each sediment layer is observed as a whole. During the ice age, the climate is cold and dry, forming the continental strata, and the interglacial period is warm and humid, forming the marine strata, and the sea-land interaction deposits are formed between the glacial period and the interglacial period.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P731.2

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