CAJ | 학술논문

里伍铜矿床是产于江浪穹窿的中型富铜矿床，其磁黄铁矿的成分和结构对矿床成因有重要的指示意义。基于对矿床地质特征的认识，采用偏光显微镜、扫描电镜能谱分析、X射线衍射等方法，对主矿体内不同构造类型矿石中的磁黄铁矿的化学成分和结构进行了分析。结果表明，矿体内部只产出六方磁黄铁矿， Fe 原子含量百分比为48．63%~47．99%，其成矿温度高于304℃；矿体边部同时存在六方和单斜磁黄铁矿， Fe原子百分比为45．97%~47．54%，成矿温度迅速降低至254℃以下。结合磁黄铁矿标型特征和矿床地质特征，推断里伍铜矿床是在原始矿胚发生变形变质活化的基础上，经历了燕山期中高温热液叠加改造而富集成矿。
리오동광상시산우강랑궁륭적중형부동광상，기자황철광적성분화결구대광상성인유중요적지시의의。기우대광상지질특정적인식，채용편광현미경、소묘전경능보분석、X사선연사등방법，대주광체내불동구조류형광석중적자황철광적화학성분화결구진행료분석。결과표명，광체내부지산출륙방자황철광， Fe 원자함량백분비위48．63%~47．99%，기성광온도고우304℃；광체변부동시존재륙방화단사자황철광， Fe원자백분비위45．97%~47．54%，성광온도신속강저지254℃이하。결합자황철광표형특정화광상지질특정，추단리오동광상시재원시광배발생변형변질활화적기출상，경력료연산기중고온열액첩가개조이부집성광。
The Liwu copper deposit is a medium-sized copper-rich copper deposit hosted in the Jianglang metamorphic core complex dome in Jiulong, western Sichuan. The present paper deals with the chemical compositions and structural types of pyrrhotite from the Liwu copper deposit based on the microscopic examination, energy spectrum analysis and X-ray diffractional analysis. The analytical results show that there occurs only hexagonal pyrrhotite in the inner part of the copper deposit, with the Fe atomic percentages ranging between 48. 63% and 47. 99% and metallogenic temperatures higher than 304℃. On the contrary, both the hexagonal and monoclinic pyrrhotite are observed in the outer part of the copper deposit, with the Fe atomic percentages ranging between 45 . 97% and 47 . 54% and metallogenic temperatures lower than 254℃. It is inferred from the typomorphic characteristics of pyrrhotite and geological characteristics of the copper deposit that the Liwu copper deposit resulted from the activation caused by deformation and metamorphism in original source beds, and superimposed reworking of moderate-to high-temperature hydrothermal solutions during the Yanshanian.