Analysis on Deep Metallogenic Trace and Simulation Experiment in Xiangshan Large-scale Volcanic Hydrothermal Type Uranium Deposit
Based on series experiments on field geologic analysis,and associated with deep metallogenic trace experiment model transformed from establishment of field deep metallogenic trace model,this paper come to the conclusion that distribution coefficients of U Th first domestic from the magmatic experiment,and then discuss the geochemical behaviors of U、Th、K during magmatic evolution stage. The experiment shows that close relationship between U and Na during the hydrothermal alteration stage; and relationship between U and K during metallogenic stage,which prove that U K are incompatible and regularity of variation between K and Na. The conclusion of uranium dissolving ability increased accompany with pressure increasing in basement metamorphic rocks and host rocks,is obtained from this experiment,which indicate a good deep metallogenic prospect. Furthermore,Pb、Sr、Nd、He isotopes show that the volcanic rocks and basement rocks are ore source beds; due to the combined functions of volcanic hydrothermal and mantle ichor,uranium undergo multi-migration and enrichment and finally concentrated to large rich deposit.