江西大湖塘钨矿床钨成矿机制研究

The Precipitation Mechanism of Tungsten from the Dahutang Tungsten Deposit in Jiangxi Province

摘要: 江西省大湖塘钨矿为已探明资源储量世界级超大型钨矿床，其矿化以白钨矿为主。本文在野外实地工作的基础上，以地球化学热力学理论为指导，结合流体包裹体实验和岩矿鉴定，研究探讨了大湖塘矿床中钨的沉淀机制。研究表明，成矿热液富含K+，Na+，Fe，Mn，F−，Cl−等离子和CO2等挥发分，其通过萃取母岩及围岩中的钨，以氟羟基硫络合物的形式迁移，在温度、压力、pH值和挥发分等因素的综合作用下，钨的络合物分解，生成白钨矿沉淀富集，由此形成大湖塘超大型钨矿床。

Abstract: The Dahutang tungsten deposit, which is located in Jiangxi province, is a worldwide super large tungsten deposit. The ore is mainly composed of scheelite. This paper studied and analyzed the precipitation mechanism of tungsten, based on the fieldwork in Dahutang and tests indoor, guided by geochemical thermodynamics theory. The research shows that the ore-bearing hydrothermal solution, which is rich in ions like K+, Na+, Fe, Mn, F−, Cl− and fugitive constituent like CO2, extracted tungsten from mother rocks and country rocks, and then tungsten was migrated by the form of fluorine hydroxyl complex. Under the action of temperature, pressure, pH and fugitive constituent, the complex of tungsten decomposed, and then scheelite formed, precipitated and concentrated, this developed the Dahutang as a super large deposit.