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《Mineral Deposits》 1998-01
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RELATIONSHIP BETWEEN ORGANIC FLUIDS AND GOLD MINERALIZATION IN THE JINSHAN GOLD DEPOSIT, JIANGXI PROVINCE

Zhang Wenhuai (China University of Geosciences, Wuhan,430074) Tan Tielong (Jiangxi Bureau of Gold Administration, Nanchang,330046)  
The Jinshan deposit is a large size gold deposit within volcanics bearing epimetamorphic rocks of Mesoproterozoic Shuangqiaoshan Group, with the mineralization obviously controlled by the ductile shear zone. Fluid inclusion studies show that there mainly exist four types of fluid inclusions in the ore district: (1) gas liquid brine inclusions which make up 80% ̄85% of total inclusions; (2) pure hydrocarbon inclusions which account for 10% ̄15% of total inclusions; (3) saline daughter minerals bearing polyphase inclusions that constitute some 1%; (4) pure CO 2 inclusions (as well as liquid CO 2 bearing three phase inclusions) that make up less than 1%. According to the study of temporal spatial evolution of fluids, the pre ore deep seated fault responsible for the upward migration of deep fluids, which carried deep pure CO 2 fluids and postmagmatic high salinity fluids; with the late stage tectonic activity, large quantities of downward circulating meteoric water not only became increasingly hotter, but also extracted organic matter from the strata during the water rock exchange; the formation of organic fluids raised the activation and migration capacity of gold in the strata, whereas the mixing between the organic fluid and the postmagmatic hydrothermal solution caused the precipitation and accumulation of gold ores. The role of organic fluid seems to have been one of the important mechanisms responsible for the formation of the Jinshan gold deposit.
【Fund】: 国家自然科学基金
【CateGory Index】: P618.51
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