Geochemistry of platinum group elements in mific-ultramafic rocks of Xinjie intrusion

摘要

The platinum group elements(PGE)in the mafic-ultranmafic suite in the Xinjie lay- ered intrusion and associated basalts and syenites were analyzed using neutron activation tech- niques after fire-assay preconcentration. On this basis, the geochemistry of the latinum group during the magmatic stage is discussed. With respect to PGE distribution, the Xinjie layered intrusion is similar to the Bushveld ferruginous ultramafic series and is distinct from komatiite and Alpine-type periodotite. It is also similar to the Emeishan basalt in PGE characteristics, im- plying that the original magmas of them may be of the same type.