Ore-forming Fluid System of the Anqing Cu-Fe Deposit, Anhui Province, China

摘要

Fluid inclusions, carbon and oxygen isotopic compositions were discussed to understanding the ore-forming fluid system of Anqing Cu-Fe deposit. Homogeneous temperatures of fluid inclusions ranged from 124°C to 570°C, δ~(13)C_(PDB) values of the gangue minerals ranged from -3.3‰ to -0.9‰, and δ~(18)O values ranged from 9.4‰ to 10.7‰, respectively. The results reveal that the primary ore-forming fluid was magmatic hydrothermal fluid characterized by high temperature, the boiling and mixing of fluids occurred in the main mineralization stage, the magmatic water was dominant in the ore-forming process, the physicochemical condition changes of the fluid system led to the formation of skarn and the deposition of the ore minerals. The ore-forming materials were mainly derived from magma, partly provided by sedimentary strata.