摘要
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.
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.
基金
ThisprojectwasfinanciallysupportedbytheNationalNaturalScienceFoundationofChina(GrantNos.49972073and40242013).
关键词
煌斑岩
地球化学
镍
沉积作用
云南
Baimazhai nickel deposit
lamprophyre
composition of mantle source region
mantle metasomatism
