CLASSIFICATION AND METALLOGENIC FLUID CHARACTERISTICS OF THE TUNGSTEN DEPOSITS IN SOUTHERN JIANGXI PROVINCE

The Southern Jiangxi Province is the most important producing area of tungsten in China. The types and classifications of the tungsten deposits are numerous and inconsistent. Based on the analysis and summarization of previously and newly discovered tungsten ore resources, the authors brief the types and metallogenic geological characteristics of each type of tungsten deposits in the area. With study on the data involving fluid inclusion petrography, microthermometry, hydrogen and oxygen isotopes of different types of tungsten deposits, the characteristics of metallogenic fluid are discussed. It is concluded that the fluid inclusions are dominated by liquid-rich phase, rarely with daughter mineral-bearing three-phase inclusions, CO₂ inclusions and fluid-melt inclusions, with various levels of temperature values, showing the characteristics of multi-stage fluid overlapping. The ore-forming fluid belongs to high temperature, low salinity and low density NaCl-H₂O-CO₂ system, mainly derived from magma, with later addition of atmospheric precipitation.