Comparison of the trace element of clinopyroxenes and xenoliths with coarse-grained and shear peridotites

The mineral chemistry, petrochemistry and the trace element of "dry" spinel -facies peridotitic xenoliths with different microstructure and their clino pyroxenes are compared and discussed in this paper. With the increasing met amorphism and deformation of peridotites in the transform from the coarse-g rained to the shear microstructure, the complex processes on enrichment and depiction existed. The metasomatism agent was the SiO2-undersaturation sil icate-carbonatite melt with strong infiltration. The results also show that the REE relationship between "dry" spinel-facies peridotitic xenoliths wit h different microstructure and their clinopyroxenes are following: there ar e obvious differences between coarse-grained peridotite and its clinopyroxe ne, on the other hand, the REE pattern of clinopyroxene can totally represe nt its host peridotite; there is only a little difference between shear per idotite and its clinopyroxene. The other high incompatible elements most pr obably existed as the inter-grain constituents or in fluid inclusions.