摘要
Based on the petrographical study of peridotite xenoliths in Yangyuan Cenozoic basalts and chemical study of minerals, the paper mainly analyzes the LAM-ICP-MS trace element compositions of Cpx from the Yangyuan peridotitic xenoliths and discusses the nature and evolution of the Cenozoic SCLM beneath the center of the Trans-North China orogen. The SCLM beneath the Yangyuan area is heterogeneous, forming from the different partial melting of the primitive mantle., most melted less than 5~ of the total, except a few among 15%~20%. The coexistence of the fertile and refractory-transitional mantle was better explained by the effects of heterogeneous erosion, transformation and replacement of asthenospheric materials on the cratonic lithosphere mantle.