1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Shenyang Institute of Geology and Mineral ��esources��Shenyang 110034��China; 3. State Key Laboratory for Mineral Deposit ��esearch��Nanjing University��Nanjing 210093��China

In order to determine the ore-forming fluid and metallogenic mechanism of the Nongping gold- copper deposit in Hunchun area��fluid inclusions within quartz grains from the veinlet-disseminated ore formed in the main mineralization stages are studied�� The study mainly focused on petrography��microscopic temperature measurement and ��aman spectroscopy of fluid inclusions in various types�� The results show that there developed five types of primary inclusions within quartz grains in gold-bearing quartz-sulfide veins��such as gas-liquid two- phase ��CO₂-bearing three- phase ��daughter- mineral bearing three- phase ��pure gas phase �� and pure liq- uid phase �� fluid inclusions�� The homogenization temperature of different inclusions changes from 237. 8�� to 399. 4�棬mainly in 310�� ��370�森 The salinity w (NaCl) has two intervals��such as 1. 39% ��12. 3% and 33. 32% ��42. 03%�� The gas phase of the ore- forming fluid is mainly composed of H₂O�� CO₂ and CH₄�� It is proved that the ore- forming fluid was boiling��which resulted in escaping of H₂O��CO₂ and other volatile components from the fluid and the enrichment of such ore-forming elements as gold and copper�� Comparing the Nongping gold-copper deposit with its adjacent Xiaoxi'nancha gold- copper deposit in ore-forming conditions and mineralization��it can be concluded that both are porphyry gold-copper deposits��and resulted from the Late Yanshanian tectonic magmatism��