前寒武纪蛇绿（混杂）岩是地球早期存在板块运动的标志记录，其中特征的豆荚状铬铁矿及其矿物包裹体可携带俯冲-碰撞、壳幔物质循环等关键信息，是板块构造和地球动力学研究的重要对象。近年来显生宙蛇绿岩铬铁矿中不仅发现有金刚石、斯石英等超高压深源矿物，同时还找到前寒武纪古老锆石等壳源矿物，表明显生宙存在板块深俯冲和壳幔物质循环作用。然而尚无研究报道前寒武纪豆荚状铬铁矿中存在类似信息。本申请以扬子克拉通庙湾和华北克拉通建平前寒武纪豆荚状铬铁矿中矿物包裹体为研究对象，对其进行形态、成分、结构和种类等特征的综合分析，探索前寒武纪豆荚状铬铁矿中是否含有深源或不寻常矿物包裹体，为前寒武纪板块构造启动时限和运动样式提供新的研究视角和基础数据。此外对比显生宙、元古宙、太古宙豆荚状铬铁矿包裹体的各类特征，推演不同地质历史时期板块运动样式，探讨不同地质历史时期地幔对流和板块运动特征的异同，从而加深对板块构造演化的认识。

Precambrian ophiolite (ophiolitic mélange) is a typical record of plate movement in the early Earth. The podiform chromite and its mineral inclusions contain some key information about subduction-collision, crust-mantle material cycle and so on. They are important objects in plate tectonics and geodynamics research. In recent years, not only ultrahigh-pressure deep-source minerals such as diamond and stishovite were recovered from Phanerozoic ophiolitic chromite, but also crustal minerals such as ancient zircons with Precambrian ages were also recovered, which indicates that there was deep subduction and crust-mantle material circulation in Phanerozoic. However, no similar information has been reported in Precambrian podiform chromite. In this application, mineral inclusions in Precambrian podiform chromite from Miaowan, Yangtze Craton and Jianping, North China Craton are taken as research objects. Their morphology, composition, structure and types are comprehensively analyzed to explore whether there are deep-source or unusual mineral inclusions in Precambrian podiform chromites, which can provide new research perspectives and basic data about the onset time and style of Precambrian plate tectonics. In addition, different characteristics of inclusions in Phanerozoic, Proterozoic and Archean podiform chromites are compared that plate movement styles in different geological periods can be deduced. Furthermore, the similarities and differences of mantle convection and plate movement characteristics in different geological periods are discussed, to deepen the understanding of plate tectonic evolution.