Abstract:

Based on the analysis of fluid inclusions (including the laser Raman spectroscopy), hydrogen and oxygen isotope in the quartz grains formed in different metallogenic stages, ore-forming physical-chemical condition and ore genesis of the Taoxikeng tungsten and tin deposit in southern Jiangxi Province have been summarized. Such five types of fluid inclusions are identified as gas, liquid, liquid-rich two-phase, gas-rich two-phase and three-phase with liquid carbon dioxide. According to characteristics of ore-forming fluid, two metallogenic stages are indicated: the early silicate-oxide stage (310-390 ℃) and late oxide-sulfide stage (180-270 ℃), respectively. Laser Raman spectroscopy of seven inclusions shows that the gas-phase in the inclusions belongs to the NaCl-H₂O series rich in CO₂, and the liquid-phase to the NaCl-H₂O series poor in CO₂. The δD values in inclusions from five samples change from -64‰ to -79‰, and δ¹⁸Owater from 5.51‰ to 6.53‰, which indicates that the ore-forming fluid was derived from the deep magmatic water. According to data mentioned above and from other research in this area, it can be concluded that the Taoxikeng deposit belongs to the magmatic hydrothermal tungsten and tin deposit associated with the S-type granite.

Key words: fluid inclusions, hydrogen and oxygen isotope, ore genesis, tungsten and tin deposit；Taoxikeng, ore deposits