赣东北朱溪矿床W-Cu共生机制：来自成矿流体的约束

钨、铜元素具有不同的地球化学性质和成矿物质来源，理论上很难共生成矿。然而，一系列大型、超大型W-Cu共生矽卡岩型矿床的相继发现，表明钨铜共生成矿现象普遍存在。但相同条件下钨、铜元素共生成矿机制尚不清楚，是亟待解决的关键科学问题。近年来，在江西发现世界级超大型朱溪矽卡岩型钨铜多金属矿床，钨金属量344万吨，铜金属量10万吨。该矿床矿体类型主要为钨铜矿体、钨矿体和铜矿体，是研究钨、铜元素共生成矿机制的理想对象。本申请拟以朱溪矽卡岩型钨铜矿体为主要研究对象，以成矿流体特征为切入点，以矿物原位微区同位素和微量元素分析、显微测温和包裹体原位成分分析为主要研究方法，开展W-Cu来源、钨铜元素配合物类型、共生沉淀的物理化学条件研究，揭示钨、铜元素共生成矿机制。结合上述地球化学指标和钻孔资料，模拟W、Cu元素共生成矿过程，建立成矿模型，为下一步找矿勘查工作提供参考。

Tungsten and copper show obviously different geochemical properties and ore-forming material sources, thus they could hardly be co-mineralized. However, with the discoveries of large and supper-large skarn W-Cu deposits, it is illustrating that the phenomenon of tungsten-copper coupling mineralization is widespread. The mechanisms of tungsten-copper coupling and decoupling under the same condition are still unclear, which is a key scientific problem to be solved. In recent years, the world-class giant Zhuxi skarn W-Cu polymetallic deposit has been discovered in the Jiangxi province, with the total reserves of 3.44 Mt WO3 and 100,000 t Cu. Orebodies types are dominated by tungsten-copper orebody, tungsten orebody and copper orebody in the Zhuxi deposit, providing a best place for studying the mechanism of couple or decouple of tungsten and copper. This project is intended to study the source of W and Cu, ore-forming fluid properties, complexes of tungsten and copper, and physiochemical conditions of precipitation, with the methods of in-situ isotope analysis and trace element analysis of minerals, thermometry and in-situ composition analysis of inclusions. Combined with the above geochemical indexes and the drill-hole information, the process of the couple and decouple of W and Cu was simulated, and the metallogenic model was established to provide a theoretical basis of future prospecting and exploration in Zhuxi area.