Comparison of the trace element of clinopyroxenes and xenoliths with coarse-grained and shear peridotites.
粗粒与剪切结构橄榄岩捕虏体及其单斜辉石微量元素对比

The mineral chemistry, petrochemistry and the trace element of "dry" spinel facies peridotitic xenoliths with different microstructure and their clinopyroxenes are compared and discussed in this paper. With the increasing metamorphism and deformation of peridotites in the transform from the coarse grained to the shear microstructure, the complex processes on enrichment and depletion existed. The metasomatism agent was the SiO 2 undersaturation silicate carbonatite melt with strong infiltration. The results also show that the REE relationship between "dry" spinel facies peridotitic xenoliths with different microstructure and their clinopyroxenes are following: there are obvious differences between coarse grained peridotite and its clinopyroxene, on the other hand, the REE pattern of clinopyroxene can totally represent its host peridotite; there is only a little difference between shear peridotite and its clinopyroxene. The other high incompatible elements most probably existed as the inter grain constituents or in fluid inclusions.