Possibility of partial melting of Horoman peridotite complex, Hokkaido during uplift from the upper mantle to the lower crust

Abstract

We investigated the origin of lithological variation in the Upper Zone of the Horoman peridotite complex using whole rock major and incompatible element contents. Plagioclase lherzolite adjacent to mafic layer is enriched in basaltic components as a result of refertilization by a melt that formed mafic layer. Plagioclase lherzolite became enriched by a melt that formed mafic layer. Chondrite-normalized REE patterns of whole rocks indicate the reaction with LREE-MREE enriched fluid that infiltrated during partial melting of plagioclase lherzolite when the Horoman complex uplifted from the upper mantle to the crust.