Abstract:

The Jubao cpper deposit in Taonan, Jilin Province is situated at the Budunhua-Changchunling tectonic-metallogenic belt. The is made up of three lode groups. Altered diorite porphyrite and a SN trending-fault control the occurrence and distribution of the Copper mineralization. The main ore minerals found in the Jubao copper deposit are chalcopyrite, Pyrite and chalcocite with varied gold and silver enrichment. The ores are featured by matasomatic texture and veined and disseminated structures. The mineralization in the deposit could be divided into four stages：pyrite; chalcopyrite; polymettlic sulfides and carbonate stages. The fluid inclusions of the Jubao copper deposit is made mainly of vapor and liquid two phases and daughter mineral-bearing three phases. The two phases inclusions is 6-8 μm with gas/liquid ratio 10%-20%, homogenization temperature between 163.8-364.0 ℃ centered mostly around 180-240 ℃,and salinity (w(NaCl)) of 1.05%-10.62%. Daughter mineral-bearing three phases inclusions is 5-10 μm，gas/liquid ratio 3%-6%，homogenization temperature 270-367 ℃and  salinity (w(NaCl)) range of 35.89%-42.85%. The Density of the liquid inclusions is 0.56-1.08 g/cm³. The mineralizeing-pressure is estimated at 11.71-42.91 MPa and the mineralizing depth at  1.12-3.0 km. It is concluded that the Jubao copper deposit belongs to medium temperature magmatic hydrothermal deposit, and the mineralization is genetically related to the  diorite porphyrite.

Key words: copper doposits, deposit character, liquid inclusion, metallogenic probpect