STUDY ON THE MINOR ELEMENTS GEOCHEMISTRY OF BANKUAN GOLD DEPOSIT

Bankuan gold deposit is located in the north part of Xiaoshan dome that is the eastern part of Qinling oregenic belts. The basement is consisted of Archean-Proterozoic metamor-phic rocks and migmatite complex. The gold bodies are existed in the fracture zones of east-west trending and the discordant zone between Archean and Proterozoic rocks. The sixteen auriferous quartz veins are classed into I vein group and Ⅸvein group based on the geologic characteristics. There were two type ores in Bankuan gold deposit, one is quartz-pyrite ore type, and another is quartz-polymetallic sulfides ore type. The host alterations of silicify and sericitize were closely associated with the mineralization of gold. The study of minor elements in the ore indicated that elements association were Bi-Pb-Au-Ag-Zn-Sb-W-Cu-As-Mo. The content of lead in ore may be used as a discrimination index of ore type. The research of minor elements shows that gold mineralization related to the ratios of Co/Ni、Cu+Pb and Rb/Sr. Gold has positive correlation to the elements:Mo、Ag、Hg、As、Pb、on vein Ⅸ, but has no correlation to any elements on vein I. Based on the clester analysis and correlation,gold mineralization were polystage on vein K and mineralizing process can be divided into three epoches with geologic setting; but only one epoch of mineralizing process were on vein I. Then, the study on the minor elements indicated that the gold mineralization on vein Ⅸ verges downwards.