中国地质调查2026，Vol.13Issue(4)：1-11,11.DOI:10.19388/j.zgdzdc.2025.270
永新金矿糜棱岩特征及其韧性变形参数对成矿构造环境的指示
Characteristics of Yongxin gold mine mylonite and its toughness deformation parameters as indicators of ore-forming structural environment
摘要
Abstract
Nenjiang-Heihe tectonic belt is an important mylonite-related gold metallogenic belt in Northeast China,but its tectonic setting and dynamic mechanism remain to be clarified.Yongxin gold mine is a large-scale gold deposit in the southwest margin of the belt,and the characteristics and ductile deformation mechanism of my-lonite in this gold mine play an important role in revealing the metallogenic regularity of regional gold mines.Based on the microscopic observations and geochemical analyses of the mylonite characteristics,combined with fractal methods to estimate the deformation parameters(deformation temperature,paleodifferential stress and strain rate),this study elucidated the coupling relationship between ductile deformation parameters and gold mineraliza-tion.The results showed the mylonites in Yongxin gold deposit could be divided into protomylonite,mylonite,and ultramylonite,developing augen structures,S-C fabrics,and core-and-mantle structures.The Au content in-creased significantly at the orebody contact zone and was not affected by mylonitization.The fractal dimension of the mylonite was0.98～1.09,corresponding to the high amphibolite-granulite facies,with a deformation tem-perature of 700～750℃.The paleodifferential stress was10.66～38.45 MPa,and the strain rate ranged from 10-15.50～10-14.94 s-1,belonging to low strain rate.This study clarifies that the ductile shear zone of Yongxin gold deposit is formed in a stable tectonic extensional environment characterized by high temperature,low stress,and low strain rate,thereby providing dynamic parameters and theoretical basis for understanding the metallogenic tec-tonic enviornment of the mylonite-related gold deposits in Nenjiang-Heihe Tectonic Belt.关键词
糜棱岩特征/动态重结晶/分形维数/变形温度/古差应力/应变速率Key words
mylonite characteristics/dynamic recrystallization/fractal dimension/deformation temperature/pa-leodifferential stress/strain rate分类
天文与地球科学引用本文复制引用
李旭东,李成禄,赵立东,赵院冬,黄伟,李卓..永新金矿糜棱岩特征及其韧性变形参数对成矿构造环境的指示[J].中国地质调查,2026,13(4):1-11,11.基金项目
自然资源部和科技部"地球深部探测与矿产资源勘查国家科技重大专项(编号:2025ZD1008707)"、中国地质调查局"黑龙江集贤地区战略性矿产找矿靶区优选与评价(编号:DD20242941)"、黑龙江省自然资源厅"黑龙江省嫩江—黑河构造混杂岩地区成矿规律研究与找矿预测(编号:黑国土科研201603)"和黑龙江省地质矿产局"黑龙江省多宝山矿集区银金矿床成矿规律研究与找矿预测(编号:HKY202301)"项目联合资助. （编号:2025ZD1008707）
