我国的铁氧化物型铜—金矿床特征及研究现状

Characteristics and Research Status of Iron-oxide-Cu-Au Deposit in China

近20年来,铁氧化物型矿床已成为许多国家勘查的重要目标。在我国,目前已被公认的该类型矿床有产于华北地台北缘与内蒙古大兴安岭褶皱系衔接地带的内蒙古白云鄂博稀土—铁矿;产于康滇地轴中段,处于EW向的金沙江褶断带与川滇经向构造交接复合部位的四川拉拉铜—金—铀—稀土矿床;与白云鄂博矿床处于相同构造背景的内蒙古哈达门沟金矿也以其成矿流体中富钾高碱且氧化性强,矿石建造中铁氧化物含量高等现象被认为具铁氧化物型金矿特征。总结3个矿床的特征,与国外典型矿床对比各具特色,与国外典型铁氧化物矿床相比也有一些差异。我国应重视铁氧化物型矿床的综合勘查,多角度分析并探索寻找该类矿床。

The iron-oxide-Cu-Au deposit has become the important investigation target in many countries in recent twenty years. In China, the Baiyunebo REE-iron ore deposit, located in the joint belt between north edge of Huabei platform and Daxinganling fold system of Inner Mongolia. Lala Cu-Au-U-REE deposit, located in middle part of Kangdian Earth＇s axis, and convergence part between EW-strike Jingshajiang folded belt and SN structure of Sichuan and Yunnan, are the putatived iron-oxide deposit. The Hadamengou gold deposit, had same structural background with Baiyunebo deposit, with K, alkali-rich and strong oxidize mineralizing fluid, and iron oxide-rich in ore structure has been seen as the characteristics of iron oxide type gold deposit. The three deposits have their own characteristics comparing with the typical iron-oxide deposit of abroad. We should pay more attention to integrate investigation of such type deposit, and find more such kind deposit in China.