摘要
赣南西华山钨矿床是我国典型的大型石英脉型黑钨矿矿床。H、O同位素的研究表明,该矿床δD值-43‰～-66‰,石英δ18O值2.3‰～13.2‰,对应的成矿流体δ18O值-8.7‰～7.6‰,表明成矿流体为岩浆水与大气降水的混合流体。不同机制下矿物O同位素模拟计算表明,冷却、沸腾和混合作用所形成矿物的O同位素组成明显不同,不同矿化阶段矿物O同位素值的投影点与冷却和沸腾演化曲线相差甚远,而与混合演化曲线比较吻合。冷却或沸腾不是西华山钨矿床成矿流体演化的主要过程,岩浆水与大气降水的混合可能才是导致钨矿化的主因。
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‰- 66‰ and the 3180 values of quartz in the deposits vary between 2.3‰ and 13.2‰while 3180 values of the mineralizing fluids between 8.7‰ and 7.6‰ 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 3180 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.
出处
《地球化学》
CAS
CSCD
北大核心
2011年第1期45-55,共11页
Geochimica
基金
国家重点基础研究发展计划项目(2007CB411408)
