过去十几年，东亚大陆边缘碎屑沉积物的“从源到汇”过程，尤其是边缘海的沉积记录与环境响应研究取得系列成果，但总体上对源汇过程及其控制机理研究还不够深入，尤其缺乏定量化研究“源—汇”过程时间尺度。申请人青年基金项目根据铀系同位素“粉碎年龄”理论，比较研究东亚大陆边缘最典型的两种河流源汇体系，即长江和台湾河流为代表的沉积物“源—汇”过程时间尺度。在此基础上，本课题结合沉积学、矿物学和同位素地球化学分析，比较研究现代长江和黄河沉积物、边缘海代表岩芯沉积物“源—汇”过程的时间尺度，揭示沉积物“搬运时间”的科学内涵；探讨中晚更新世以来冰期旋回过程中，东亚大陆边缘沉积物“源—汇”过程时间尺度的变化特征和环境响应。此外，本课题还探究东亚与南亚河流沉积物“搬运时间”的差异，揭示不同构造—气候背景下流域沉积物转换的速率。本课题预期将深化东亚大陆边缘沉积物“源—汇”系统过程研究和河海相互作用研究。

In the past decade, the sediment “source to sink” (S2S) study in East Asia continental margin has achieved a lot on deciphering the sediment archives and its environmental significance, while the mechanism of sediment S2S process is still unclear, in particularly for the quantitative constraint of the time scale of sediment S2S process. The time scales of two typical river S2S systems, the Changjiang River and the river in Taiwan Island, are compared in terms of comminution age funded by a former NSFC support. On this basis, this proposal aims to compare the time scales of sediment S2S processes between sediments from Changjiang, Huanghe and the East Asia continental margin, in terms of sedimentology, mineralogy and geochemistry. Furthermore, the evolutions of time scale of sediment S2S processes in East Asia continental margin in response to environmental change are well discussed during the glacial–interglacial since mid-late Pleistocene. In addition, the transport time of river sediment from East and South Asia is carefully compared in order to distinguish sediment transfer rates under different tectonic and climatic conditions. This proposal is supposed to promote the sediment S2S study and land-sea interaction study in East Asia continental margin.