产于地幔橄榄岩中的刚玉隐含有深部地幔信息，因此对刚玉进行精细的矿物学研究有利于探讨寄主岩石的成因。本项目拟利用聚焦离子束（FIB）和透射电镜（TEM）对苏鲁超高压变质带地幔橄榄岩和罗布莎蛇绿岩地幔橄榄岩的刚玉进行精细的微区矿物学研究，对比两种类型地幔橄榄岩内的刚玉成分特征以及包裹体差异，明确刚玉的岩石学指示意义。利用稀土微量元素、同位素和激光拉曼分析技术并配合超高压矿物的高温高压实验重点研究刚玉及其中的矿物包裹体，结合刚玉及其包裹体的物质成分和晶体结构等参数，以矿物的晶体化学理论为依据，计算刚玉及其内包裹体分别所代表的温压条件，探讨他们所代表的物理化学条件，并讨论它们的物质来源、形成和保留的机制。分析刚玉的形成条件以及其与寄主岩相的成因联系，为两种不同类型地幔橄榄岩的对比研究提供矿物学依据，也为窥探深部地幔特征提供了一种新思路。

As containing the clue of deep mantle, the corundum could be used to investigate the origin of hosting mantle peridotite through detailed mineralogical researches. This project will perform detailed mineralogical analyses using focused ion beam (FIB) in combination with transmission electron microscope (TEM), on the mantle peridotite collected from both Sulu ultrahigh-pressure metamorphic belt and Luobusa ophiolite, to identify the indicative petrological significance viewing from the composition and inclusion features. We will focus on the components and crystal structures of corundum and its inclusions, the temperature and pressure conditions will be calculated following the crystal chemical theory of minerals to reveal the physical and chemical conditions where they formed. Furthermore, we want to know their material source, the formation and preservation mechanism, the genetic relationship. Then, the mineralogical evidences will be supplied for the genetic comparative researches of the two different types of mantle peridotite, and one new window for investigating the deep mantle features are to be expected.