紫金山金铜矿二元铜硫化物成分特点的初步研究

Preliminary compositional investigation of binary Cu sulfides from Zijinshan Au-Cu deposit

文章在电子显微成分分析的基础上,结合XRD、振动光谱等研究手段,对高硫型浅成热液形成的紫金山金铜矿床中铜硫化物的成分、物相特点进行了研究。首次在该区找到了久辉铜矿(Cu1.97S)、雅硫铜矿(Cu1.25S)等铜硫二元组分系列矿物,并发现了铜蓝被蓝辉铜矿明显交代的现象,进而推断它们基本上是同期形成的,但其所处的氧化-还原环境有所差别。这些铜硫系列矿物主要是热液蚀变对早期原生硫化物进行交代所形成的产物。

In this paper,the chemical composition of some binary Cu sulfides from highly sulfidized epithermal Zijin-shan Au-Cu deposit was investigated,and mineral phases in the ores were determined with electron microprobe analysis,X-ray diffraction and vibrational spectroscopy.Djurleite（Cu1.97S）and yarrowite（Cu1.25S）from this ore deposit were recognized for the first time.In addition to the replacement of digenite（Cu1.80S） by covellite（Cu1.01S）,some covellite was replaced by digenite and anilite（Cu1.75S）.These phenomena imply that these Cu sulfides were formed contemporarily from the same hydrothermal solution,but under different oxidization-deoxidization conditions.The formation of these minerals resulted from the alteration of the earlier primary sulfides by Cu-rich hydrothermal solutions.