超大陆旋回是地球科学领域重要的科学问题之一。超大陆的聚合与裂解对地球岩石圈，水圈，大气圈和生物圈产生重要的影响。本次研究将以扬子地块东南缘发育的~870-800Ma期间关键期次岩浆岩为研究对象，通过系统的年代学，岩石学和地球化学研究，查明准确的形成和持续时间，反演岩浆岩形成时地幔的热状态和物理化学特征演化。为了解超大陆形成初期地幔动力学和地幔地球化学成分演化，准确确定早新元古代时期华南地块在Rodinia超大陆中的位置，检验超大陆形成最初的板内伸展模型提供关键的资料。

Supercontinent cycle is one of the important issue on the Earth Science. The assembly and breakup of a supercontinent have profoundly influenced the evolution of the geosphere, hydrosphere, atmosphere and biosphere. This study will focus on the crucial magmatic rocks during ~870-800Ma, through systemic geochronology, petrology and geochemistry works, the accurate formation time and duration will be found out and the thermal state and physical and geochemical features of the mantle during initial assemble a supercontinent will be inversed. These studies will provide important informations for understanding mantle dynamics and mantle geochemical components evolution in early stage of supercontinents, fiting the South China Block in supercontinent Rodinia and verifying intra-plate extension modal for the initial assemble a supercontinent.