新疆加曼特金矿铜硫化物矿物特征及其地质意义

Microscopic Identification and Electron Probe Microanalysis of Copper Sulfides in Jiamante Gold Deposit of Xinjiang

新疆加曼特金矿床初步认为是中低温浅成热液型金矿床[1],该矿矿物组分较复杂,形成温度较低,主要为金属硫化物.通过实验与观察,首次发现辉铜矿、蓝辉铜矿、久辉铜矿这三种铜硫化物矿物,见于石英-硫化物主成矿阶段;通过镜下显微观察,得知该铜硫化物系列与其它金属硫化物、金矿物伴生,被表生期形成的金属氧化物所交代;通过电子探针分析,发现辉铜矿等铜硫化物矿物中Au、Ag含量较高,尤其是Ag;最后,通过与紫金山金铜矿床铜硫化物系列矿物的对比,为加曼特矿床类型的进一步确定奠定了基础.

It is considered that Jiamante gold deposit of Xinjiang is a meso-epithermal quartz-vein type gold deposit. The mineral composition is relatively complex, and most of them are metal sulfides, which have the low formation temperature. This paper has done some analysis on the firstly discovered copper sulfides including chalcocite which are formed in main mineralization stage of quartz-sulfide： Through microscopic identification, it is known that the copper sulfide series are associated with other metal sulfides and gold,and replaced by metallic oxide formed by supergene mineralization; Through Electron probe microanalysis,it is found that these copper sulfids have high content of gold and silver, especially the silver, meanwhile, the crystal chemical formulas of these minerals have been calculated, thus, to some extent, the trace elements＇ geochemical behaviors can be revealed; Lastly, through the comparison with the copper sulfide series of Zijinshan gold-copper deposit, the foundation can be laid for further ascertaining the type of Jiamante gold deposit.