The sheetliked SaimaBailinchuan alkaline vo lcanicintrusive complex consists of syenitesphonolite and nepheline syenite sTwo type s of magmas were produced from the metasomatized mantleThe maficpoor and al kalialuminumrich alkaline magmas were generated by meltng of mafic mica and clinopyroxene in the source regionThe sye nite magma was formed by enrichment in metasomatized mantle ,and the nepheline syenite magma was produced from the more enriched mantle after a period of pause of magma activitySome of the compositions of the uppe r crust joined in the alkaline magmas