REE geochemistry of lamprophyres in Baimazhai nickel deposit, Yunnan Province, China： implication for the mantle source region

Based on the REE geochemistry data from the Baimazhai nickel deposit, Yunnan Province,the authors modeled the composition of the mantle source region by way of petrological mixing calculation,and further discussed the genesis of this type of rocks. Both element geochemistry data and mixing calculation showed that lamprophyres in the Baimazhai nickel deposit were derived from a metasomatism-enrichment mantle and the fluids resulted from dehydration of a subducted slab which is comprised of ALK-,LREE-and incompatible element-rich sediments.