Some geochemical characters of the kimberlites from different rock regions in North China platform are compared in this paper at first. The characters of the source regions are constrained then based on primary magmas...Some geochemical characters of the kimberlites from different rock regions in North China platform are compared in this paper at first. The characters of the source regions are constrained then based on primary magmas compositions of typical regions chosen. The differences in metasomatic fluid activity in the lithosphere are discussed moreover. The diamondiferious kimberlitic sources, such as Fuxian and Mongying, were located at the fluid metasomatic mantle lithosphere or the boundary between the lithosphere and the asthenosphere(200-230 km), and enrich in LREE,Ti and isotope Sr but deplete in isotope Nd. Tieling is located nearby Paleozoic mobile belt, strong activity in fluids and shallower depth of magma source (～150 km), highest in w(LREE) and w (P), lower in w(Ti). But the shallowest depth of magma source (<130 km ) and weak activity in fluids are in Hebi and Shexian sources.展开更多
文摘Some geochemical characters of the kimberlites from different rock regions in North China platform are compared in this paper at first. The characters of the source regions are constrained then based on primary magmas compositions of typical regions chosen. The differences in metasomatic fluid activity in the lithosphere are discussed moreover. The diamondiferious kimberlitic sources, such as Fuxian and Mongying, were located at the fluid metasomatic mantle lithosphere or the boundary between the lithosphere and the asthenosphere(200-230 km), and enrich in LREE,Ti and isotope Sr but deplete in isotope Nd. Tieling is located nearby Paleozoic mobile belt, strong activity in fluids and shallower depth of magma source (～150 km), highest in w(LREE) and w (P), lower in w(Ti). But the shallowest depth of magma source (<130 km ) and weak activity in fluids are in Hebi and Shexian sources.
