地质科学2025，Vol.60Issue(4)：1215-1226,12.DOI:10.12017/dzkx.2025.080
载金黄铁矿晶体塑性变形与不可见金迁移—富集的关系
Relationship between the crystal-plastic deformation of gold-bearing pyrite crystals and the migration-enrichment of invisible gold
摘要
Abstract
Shear zone type gold deposit is an important gold deposit type,and its metallogenic mechanism is the current research focus.Pyrite is the most important gold-bearing mineral in shear zone gold deposits.Revealing the relationship between its tectonic deformation and Au mobilization-enrichment is of great significance for further understanding the Au enrichment mechanism in shear zone type gold deposits.In this study,the microstructure observation and in-situ trace element analysis of pyrite in Rushan gold mine were carried out.The results show that:1)the occurrence form of"invisible gold"in pyrite of Rushan gold mine is mainly nano-gold(Au0)and a small amount of lattice gold(Au+).2)Different degrees of crystal-plastic deformation occurred in pyrite,and Au was enriched at low-angle boundaries/dislocation walls.At the same time,microscopic observation of low-angle boundaries shows no brittle deformation and external connectivity,excluding the influence of external fluid migration Au.This study suggests that the migration mechanism of'invisible gold'in pyrite of Rushan gold deposit is the diffusion of dislocation-impurity pairs.Pyrites experience plastic deformation under the action of tectonic stress.In the process of dislocation/defect creep slip,the impurity Au elements occupying the lattice defect positions are entrained and migrated together,which eventually leads to the enrichment of Au element at the low angle boundary of pyrite.This study reveals that lattice structure changes and chemical bond adjustments induced by tectonic stress may have a significant impact on element migration at the single-mineral grain scale.关键词
剪切带型金矿/黄铁矿/晶体塑性变形/位错迁移/不可见金迁移—富集Key words
Shear zone type gold deposit/Pyrite/Crystal-plastic deformation/Dislocation migration/Invisible gold migration-enrichment分类
天文与地球科学引用本文复制引用
石梦岩,亢怡萱,侯泉林,程南南,马毓民,宋延斌,刘玉洁..载金黄铁矿晶体塑性变形与不可见金迁移—富集的关系[J].地质科学,2025,60(4):1215-1226,12.基金项目
河南省科技攻关项目(编号:242102320359)、河南省自然科学基金项目(编号:232300420437,232300420439)和河南省高等学校重点科研项目(编号:23A170009,23A170015)资助 （编号:242102320359）
