现代地质2025，Vol.39Issue(3)：667-680,14.DOI:10.19657/j.geoscience.1000-8527.2024.109
胶东半岛牟平—乳山成矿带金矿黄铁矿成因矿物学特征及地质意义
Genetic Mineralogy and Geological Significance of Pyrites from the Muping-Rushan gold belt,Jiaodong Peninsula
摘要
Abstract
Pyrite is the most prevalent metal sulfide in the Earth's crust,widely distributed in various types of metal deposits and serving as a crucial gold-bearing mineral in gold deposits.This study focuses on pyrite from typical gold deposits in the Muping-Rushan metallogenic belt.Through integrated polarized microscopy and elec-tron probe microanalysis,we systematically investigated the typomorphic composition of pyrite in different stages of four metallogenic stages of gold deposits in the study area.Polarizing microscope analysis and electron micro-probe elemental mapping showed that there are obvious differences in crystal form and grain size of pyrite in dif-ferent mineralization stages.Stage Ⅰ pyrite(Py1)is coarse-grained panidiomorphic-hypidiomorphic cubic py-rite.Stage Ⅱ pyrite(Py2)is fine-grained hypidiomorphic-allomorphic pentagonal-dodecahedral crystal.StageⅣ pyrite(Py3)is fine-grained panidiomorphic-hypidiomorphic cubic pyrite.The arsenic contents are higher at the rims and in cracks of stage Ⅰ cube pyrite(Py1)and around stage Ⅱ fine-grained pentagonal dodecahedral pyrite(Py2).Native gold and silver occur mainly as thin veins in cracks in stage Ⅰ pyrite(Py1)or around stage Ⅱ pyrite(Py2).Electron microprobe analysis of major and trace elements also shows significant differ-ences.The content of Fe and S in stage Ⅰ pyrite is the closest to the theoretical value,while stage Ⅱ pyrite has an obvious sulfur deficit,and stage Ⅳ pyrite has a ferrum deficit.In addition,the study of gold occurrence state indicates that the invisible gold in the gold deposits from the Muping-Rushan gold belt is Au0 nanoparticle gold.From the early to late mineralization stages,pyrite exhibits a crystal morphology transition from cubic →fine-grained pentagonal dodecahedral → fine-grained cubic forms,indicating a progressive cooling trend of ore-forming fluids.The main mineralization stage is characterized by moderate-low temperatures with elevated sulfur fugacity.关键词
胶东半岛/牟平—乳山成矿带/电子探针/黄铁矿/赋存状态Key words
Jiaodong Peninsula/Muping-Rushan gold belt/electron probe microanalysis/Pyrite/occurrence state分类
地质学引用本文复制引用
何江涛,李俊建,石光耀,王晨光,满荣浩..胶东半岛牟平—乳山成矿带金矿黄铁矿成因矿物学特征及地质意义[J].现代地质,2025,39(3):667-680,14.基金项目
河北地质大学国家预研项目(KY2024QN25) （KY2024QN25）
河北地质大学博士科研启动基金项目(BQ2024006) （BQ2024006）
河北省青年科学基金项目(D2022403027). （D2022403027）
