大火成岩省是地质历史中大规模镁铁质岩浆侵位喷发的产物，是研究地球深部物质组成的天然载体。尽管国内外学者对出露于我国西南的峨眉山大火成岩省已开展了大量研究，然而对于其源区组成和各组分成因仍存在较大争议。造成这种争议的主要原因是前人多采用的是全岩的研究手段。全岩组成是包括矿物分离结晶，岩浆混合，地壳同化混染和风化蚀变等过程的综合产物，使用全岩研究不可避免存在多解性。而熔体包裹体是矿物结晶过程中捕获的岩浆液滴，可直接代表矿物结晶时的岩浆成分。本研究选取峨眉山大火成岩省中大理苦橄岩为研究对象，通过分析苦橄岩中橄榄石中的熔体包裹体的主微量元素，Sr和Pb同位素组成，及其寄主橄榄石的元素组成，来探讨峨眉山大火成岩省中溢流玄武岩的源区组分，以及各组分的成因，并用以制约峨眉山溢流玄武岩的成因。

The Emeishan large igneous province (LIP), which is located in southwest China, provides us a best opportunity to detect the material composition of the deep Earth. Though a lot of studies have focused on the Emeishan LIP, the components of the Emeishan LIP and the origin of each component is hotly debated, which is manly caused by that most previous studies only used the whole rock methodology. Whole rocks record only an average composition produced by complex petrogenesis involving crystal fractionation, magma mixing and crustal contamination. On the contrary, melt inclusion is little magma drop which is captured by crystallizing minerals. Thus, melt inclusion can represent the magma composition when its host mineral crystallizing. This project is planning to conduct systematical melt inclusion study on Dali picrite, which composes of the analyses of major and trace elements, Sr and Pb isotope of Dali olivine-hosted melt inclusions. This project will reveal 1) the components of the Emeishan LIP mantle source. 2) The origin of each component and 3) the indication for the formation of the Emeishan flood basalts.