南海是研究海洋-大陆岩石圈板块相互作用的重要窗口。近年来，南海已取得大量的观测资料，逐渐成为边缘海研究的典型范例。然而目前的研究主要集中于南海浅部构造，对南海深部构造的动力学过程缺乏了解。本项目以目前已知的地球物理与地球化学综合观测数据为约束，应用先进的地球动力学模拟工具，改进南海与周边俯冲系统的板块运动重构模型，建立定量化的南海及周边俯冲系统深部地幔演化的三维动力学模型，重现南海地幔的演化历史，追踪南海地幔物质运移轨迹，确定南海地幔上涌特征及地幔物质来源，揭示俯冲作用控制南海深部地幔演化的地球动力学机制。本项目将重点解决周边俯冲引发南海北部地幔上涌的动力学机制、俯冲带演化对南海地幔物质循环的影响、南海周边俯冲板块演化过程及其对南海南部重力不均衡的影响机制等重要科学问题，揭示南海地幔演化过程及与周边俯冲系统相互作用的动力学机制，取得南海构造研究的突破。

The South China Sea (SCS) is an important window for studying the mantle dynamics and interaction of oceanic-continental plates. In recent years, a large amount of observational data has been obtained in the SCS, making it an excellent natural laboratory of marginal sea research. However, most of the current research focused mainly on relatively shallow structure of the South China Sea, and our understanding of the dynamic processes of the deeper structure of the SCS is still poor. Based on the collected geophysical and geochemical data, this project will conduct the state-of-art geodynamic simulations to reconstruct the plate motion and establish a quantitative framework for studying the evolution of the SCS mantle domain and interaction with surrounding subduction systems. The three-dimensional geodynamic modeling, using the ASPECTS modeling platform, aims to reproduce the evolution of the SCS mantle domain, reveal mantle temperature anomalies and melting processes beneath the SCS, and trace the 3D migration paths of interested patches in the mantle. This project will illustrate the geodynamic mechanisms by which the subduction systems control the evolution of the SCS mantle domain. The project will focus on specific scientific problems: (1) Temporal evolution of the mantle domain of the northern SCS, especially where seismic data have shown broad anomalies above the mantle-transition zones; (2) Changes in mantle convection beneath the SCS as a function of the changing geometry of the surrounding subduction zones; (3) the influence of mantle dynamics on the observed large non-isostatic gravity anomalies in the southern SCS. In summary, this project aims to reveal the mantle dynamic process of the SCS and the interaction with the surrounding subduction systems, providing important new insights to our understanding of the SCS tectonics and mantle dynamics.