浙闽河流入海沉积物组成及其来源的研究对于深入理解东亚大陆边缘沉积物的从源到汇过程具有重要意义。浙闽河流流域的地貌和气候背景与东亚大陆上的大河流域具有一定的差别，在自然环境变化和人类活动双重因素不同时间尺度的影响下，其沉积物输运过程及入海沉积物组分的变化规律，目前并不清楚。考虑到闽江流域上、下游主要母岩类型的不同及降水的季节差异，本项目拟选取闽江下游近河口段不同季节的悬浮沉积物为主要研究对象，运用微量元素和Sr-Nd同位素地球化学手段，进行悬浮沉积物的物源示踪，与主要支流、干流沉积物地球化学分析数据进行对比，明确闽江入海沉积物的源区及其季节时间尺度的演化规律，揭示影响入海沉积物组分的主控因素。上述研究将为东海陆架和台湾海峡沉积物的源区分析等热点领域提供重要的参考数据，对东亚大陆边缘源汇系统的深入认识和构造-沉积演化历史的重建也具有指导意义。

Study on the composition and source of sediments discharged by the Zhejiang and Fujian rivers is crucial to have a better understanding of the sediment source-to-sink process in the East Asia continental margin. The river basins in Zhejiang and Fujian have different landform and climate conditions with the big river basins in the East Asia. The sediment transport and the discharged sediment compositional variations, which are probably controlled by both natural and anthropogenic influences on different temporal scales, remain poorly known. As there are distinct parent-rocks in the upper and lower Minjiang river basin and rainfall shows spatial variations in different seasons, Minjiang river is selected as the study area. This project will mainly focus on seasonal suspended sediments from a fixed location near the river mouth in the lower Minjiang river. Geochemical data of sediments from major tributaries and the middle-lower mainstream will be collected and trace elements and Sr-Nd isotopes will be employed in the sediment provenance analysis. The objectives of this project are to figure out the major source of the discharged sediments from Minjiang river and its seasonal variations and to conclude the major controls on the discharged sediment geochemical compositions. The results of this project will not only provide additional significant data for some hot research fields such as provenance study of sediments in the East China Sea and the Taiwan Strait, but will also be beneficial for better understanding the source-to-sink system and reconstruction of the tectonic-sedimentary history of the East Asia continental margin.