MINERALIZATION REGULARITY OF THE COPPER-GOLD POLYMETALLIC DEPOSITS IN DAYAOSHAN,GUANGXI,CHINA

Dayaoshan in Guangxi Region is a significant Cu-Au polymetal producing area,where the Cu-Au deposits occur mainly in Cambrian strata,related to Caledonian and Yanshanian tectonic activities and magmatism.Based on the theory of metallogenic series and the results of previous geological survey,this paper summarizes the mineralization regularity of the Dayaoshan Cu-Au polymetallic deposits related to the hypabyssal magmatic rocks.It is believed that the metallogenic period of the deposits involved Late Caledonian,Early and Late Yanshanian,among which the Early Yanshanian is the most important.From the center of the mineralized rock body,the deposit types and mineralization are zonated horizontally and vertically.The deposit types vary in the following order: porphyry type → skarn type → fracture-altered rock type,with mineralization zonation of Cu → Ag(-Au) → Au.This zonation can be partly repeated or imperfect.This study points out the prospective areas for further exploration.