中国科技核心期刊
美国化学文摘社(CAS)数据库
美国EBSCO学术数据库
日本科学技术振兴机构数据库(JST)
陶善夫 1,肖启亮 2*,孙志远 1,孙永刚 1,李焕纪 1,李晓林 1,陈旭升 3
Tao Shanfu1, Xiao Qiliang2, Sun Zhiyuan1, Sun Yonggang1, Li Huanji1, Li Xiaolin1, Chen Xusheng3
霍洛台铜(钼)矿床作为大兴安岭北段新发现的斑岩型铜矿床,关于其主要金属硫化物(黄铁矿和黄铜矿)的研究相对薄弱,限制了对成矿环境和矿床成因的认识。以霍洛台铜(钼)矿床中的黄铁矿和黄铜矿为研究对象,对其进行电子探针分析。电子探针分析结果显示:黄铁矿中As和Ni元素可能以矿物包裹体形式存在,Co和Mo元素可能以类质同象形式存在;黄铜矿中Zn和Mo元素可能以矿物包裹体形式存在,As和Co元素可能以类质同象形式存在。黄铁矿与黄铜矿的 S和Fe含量均低于理论值,整体表现为贫 Fe贫 S特征。黄铁矿 w(S)/w(Fe)值为 1.181~1.216,大于1.148,说明其形成于硫逸度较高的环境。黄铜矿[n(Cu)+n(Fe)]/n(S)平均值为 0.941,推断黄铜矿的形成温度接近 200 ℃,表明黄铜矿等金属硫化物很可能在中温热液环境下形成。黄铁矿的 δFe和 δS分别为-0.095~-0.050和-0.044~-0.007,w(S)/w(Se)值为 0.128×104~0.241×104,指示黄铁矿为岩浆热液成因。
The Huoluotai Cu(Mo)Deposit, a newly discovered porphyry‑type copper deposit in the northernGreater Khingan Mountains, remains understudied with respect to its main metal sulfides(pyrite and chalcopyrite)which restricts understanding of its ore‑forming environment and genesis. This study focuses on the geochemicalcharacteristics of pyrite and chalcopyrite within the deposit, based on electron probe analysis. The results show thatarsenic(As)and nickel(Ni)in pyrite likely occur as mineral inclusions, while cobalt(Co)and molybdenum(Mo)may be present in isomorphic substitution. In chalcopyrite, zinc(Zn)and Mo may also occur as mineral inclusions,while As and Co are possibly present in isomorphic substitution. Both pyrite and chalcopyrite generally show Fe‑ andS‑deficient characteristics compared with their theoretical compositions. The w(S)/w(Fe)ratio of pyrite ranges from1.181 to 1.216, exceeding 1.148, indicating formation under relatively high sulfur fugacity conditions. The average value of[n(Cu)+n(Fe)]/n(S)in chalcopyrite is 0.941, suggesting a formation temperature close to 200 °C, which implies thatchalcopyrite and associated metal sulfides were likely precipitated from a medium‑temperature hydrothermal system. TheδFe and δS values of pyrite range from −0.095 to −0.050 and −0.044 to −0.007, respectively, and the w(S)/w(Se)ratioranges from 0.128 × 10⁴ to 0.241 × 10⁴, indicating a magmatic hydrothermal origin.