钨在富F和还原性热液体系中溶解、迁移行为的实验和计算模拟研究

钨在新兴产业具有不可替代的重大用途，西方发达经济体均将其列为关键金属而高度重视钨矿研究。全球与花岗岩相关的钨矿床大多与富F和还原性的成矿热液相关。为揭示这种相关性，前人曾对钨在流体体系中的溶解、迁移行为开展过部分实验地球化学研究。但受实验设计和分析手段的限制，这些研究缺乏对氧逸度的控制，也缺乏对pH、HF浓度等单一变量的控制，未能揭示钨在含F和还原性热液体系中溶解迁移行为这一本质问题。针对上述科学问题，本项目拟在精细控制氧逸度、pH、HF、NaCl浓度等因素的基础上，系统开展钨在含F热液和还原性（fO2≤FMQ-2）热液体系中溶解迁移的实验，确定钨在这些热液体系中溶解度、迁移形式及相应物种的热力学参数。在此基础上，应用HCh软件对流体条件进行计算模拟，揭示F含量和氧化还原条件等的变化对钨成矿的制约机制，为揭示钨成矿与富F和还原性成矿热液之间的本质联系提供理论依据。

Tungsten is one of the irreplaceable metals widely used in the emerging industry. Western developed economies underline tungsten as critical and strategic metal and high emphasis on tungsten ore research. Tungsten deposits are commonly associated with fluorine-enriched hydrothermal fluids derived from high-fractional granitic magmas. Hydrothermal fluid of some tungsten deposits contains hydrocarbons showing reduced oxidation. In order to reveal such a genetic relationship, several experimental studies have been carried out on the tungsten solubility and transport in the hydrothermal fluid. However, due to a lack of comprehensive experimental design and analyzes mothed, and a lack of oxidation control and one variation control e.g. pH and NaCl concentration, the mechanisms of tungsten transport in F-enriched and reduced hydrothermal fluid are still unclear. To this end, this application would carry out experimental studies on the tungsten solubility and transport in the F-enriched and reduced (fO2 ≤ FMQ-2) fluid on basis of comprehensive oxidation control and one variation control e.g. pH and NaCl concentration. It would expect to reveal the tungsten solubility, transport formation and obtain new species and their thermodynamic parameters. In addition, we would model the fluorine-enriched fluid-rock interaction and redox reactions with the assistance of HCh software, so that we could give new constraints on the genesis of the tungsten deposit.