Abstract:

Zoujiashan deposit, located at the west of Xiangshan volcano-intrusive complex, is a typical hydrothermal vein-type uranium deposit, which is governed by Zoujiashan-Shidong fault and its induced tension or tenso-shear fracture zones. The vein- and lens-shaped ore bodies are in group and in zone.The wall rock alteration can be divided into two epochs.The early epoch is characterized by alkalic replacement with albitization, apatitization, and carbonatization, and the late is acid alteration with fluoritization and hydromicazation.The evolution characteristics that both the acidity and δ¹⁸O of the ore-bearing hydrothermal fall gradually from the early epoch to the late, are similar to those of other typical porphyry deposits.The coexistent relationship between U and Th in ores, and the similar REE patterns of uraninites, ores, granite-porphyrys and clastoporphyritic lava indicate that ore-forming materials, as granite-porphyrys and clastoporphyritic lava, originated from the deep magmatic system.They are of the same source.

Key words: metallogenetic characteristics, hydrothermal evolution, magmatic system, Zoujiashan deposit