Investigation of sheared garnet lherzolite xenoliths in unaltered kimberlites from the Udachnaya-Eastern pipe indicates that these xenoliths have compound composition: primary mineral assemblage + melt pockets + secondary melt inclusions in primary minerals. There were two types of melt inclusion determined. The first one is presented in all primary minerals. They consist of fluid bubble + fine crystalline aggregates + transparent crystalline phases (silicates, carbonates, sulfates, chlorides) + ore phases (magnetite, sulphides). The second one was discovered only in ortopyroxene. They consist of fluid bubble and transparent crystalline phases (calcite and/or gregoryite). Unusual composition of melt inclusion point to unexpectedly high concentration of alkalies, carbon, chlorine and sulfur in some deep mantle melts or there derivates.
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