CONTROL OF GOLD DEPOSIT FORMATION IN THE XIAO QINLING GOLD FIELD BY MAGMATISM

The Xiao Qinling gold field is characterized by frequent magmatic activity, evolution of gold origin from replacement to mamatic one from older to younger, gradual increase in sodium content in the rock mass and gradual shallowing of the depth of the formation of the rock mass. Gold quartz veins occur in the Archean Taihua Group, their age being late Yanshanian. They are all distributed around late Yanshanian granite masses. Late Yanshanian granites are sodic granites, which represent the latest and greatest magmatic activity having ever taken place in the history of the Xiao Qinling gold field and have played a leading role in the formation of gold-bearing solutions and provision of higher temperatures and pressures for the solutions.