赣南西华山钨矿床的流体混合作用：基于H、O同位素模拟分析

Xihuashan tungsten deposit in Southern Jiangxi Province is a large typical quartz-vine type wolframite deposit. Based on hydrogen and oxygen isotope data measured in this paper and others, the δD values of fluid inclusions are -43‰ to -66‰, and the δ18O values of quartz in the deposits vary between 2.3‰ and 13.2‰, while δ^18O values of the mineralizing fluids between -8.7‰ and 7.6‰. It is suggested that the ore fluids were a mixture between magmatic water and meteoric water. The oxygen isotope composition of minerals precipitating by each mechanism was modeled. It is evident that cooling, boiling and fluid mixing have a contrasting influence on the oxygen isotope composition of the precipitating minerals. The mixing of a magmatic fluid with meteoric water reproduces the observed δ^18O composition of the ore and gangue minerals remarkably well. Cooling or boiling is not a major process in the evolution of ore-forming fluids, while the magmatic water mixed with meteoric water may result in wolframite deposition.