摘要
Abstract
The Dahongshan deposit is a typical proterozoic iron oxide-copper-gold deposit in the Kangdian region,and the formation and preservation of ore bodies are controlled by multi-stage structural reworking.Based on the 60 m level as the research object,this paper identified the geometric characteristics,mechanical properties,and ore-controlling effects of syn-ore and post-ore faults through crosscut drift mapping,fault interpretation,and ore-field geomechanical analysis,and discussed the evolution of the tectonic stress field.The results indicate that NW-trending faults during the syn-mineralization stage developed as dextral transtensional to extensional structures under NW-SE-directed compression,serving as major fluid pathways and ore-hosting structures for the quartz-carbonate-copper vein system during hydrothermal overprinting.Post-mineralization reactivation transformed these faults from extensional-transtensional to compressional-transpressional structures under NE-SW-directed compression,leading to displacement,cataclastic deformation,and modification of the stratiform Cu-Fe orebodies.It is concluded that the structural ore-controlling characteristics of the 60 m level exhibit hierarchical features"folds controlling ore-bearing strata,interfaces controlling ore localization,fractures controlling ore veins".The anticlinal hinge zones,silicic-carbonate interfaces,and composite zones of NW-trending tenso-shear faults and interlayer crushed zones are key targets for deep and peripheral mineral exploration.关键词
构造控矿/断裂力学性质/古应力场/IOCG矿床/大红山矿床/康滇地区Key words
structural ore-controlling/mechancial properties of faults/Paleostress/IOCG deposit/Dahongshan deposit/Kangdian region分类
天文与地球科学
