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 SiO2-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.
|Number of pages||6|
|Journal||Acta Petrologica Sinica|
|Publication status||Published - 2001|
- Different microstructure
- Trace element