摘要
为探讨南吕—欣木金矿床金的赋存状态及富集机制,结合矿区地质特征,采用能谱和电子探针(EPMA)对研究区内采集的岩(矿)石标本进行分析,获取矿物生成顺序,分析金矿物的形态、粒度、成色和赋存状态,探讨金的富集机制。研究表明:南吕—欣木金矿床成矿阶段可划分为4个阶段,即黄铁矿—石英(Ⅰ)、金—石英—黄铁矿(Ⅱ)、金—石英—多金属硫化物(Ⅲ)和石英—方解石(Ⅳ),其中第Ⅰ、Ⅲ阶段是金的主要成矿阶段。金的赋存状态有晶隙金(占49.87%)、裂隙金(占42.81%)和包体金(占7.32%)。裂隙金的大小为7~20μm。金成色变化范围在886~943之间,平均成色为845,变化系数为11.72%。相关分析结果显示:相关性显著的元素是Ag和Ag、Fe和S。金与其他元素的相关性大小依次是Au→Ag→Cr→Fe→S,与Pb、Cu和Zn等元素相关性不大。黄铁矿是主要的载金矿物。金从矿源层(古老变质岩和玲珑复合岩体)溶滤出来,以简单的氯化物和络合物等迁移,富集在2个成矿阶段叠加部位。研究结果为揭示区域金的赋存状态和矿床成因提供了证据,也为总结焦家金成矿带成矿规律提供了科学依据。
The Nanlü-Xinmu gold deposit is a super large gold deposit since explored.In order to discuss the occurrence status and enrichment mechanism of gold,rock and ore samples were collected in this study.The ore structure,mineral composition,mineral generation sequence,mineralization stage division,and the morphology,particle size,fineness,occurrence status,and enrichment mechanism of gold were obtained by using optical thin section identification,energy spectrum,and electron probe microanalysis(EPMA)methods.The mineralization stage of Nanlü-Xinmu gold deposit can be divided into four stages,namely pyrite-quartz(Ⅰ),gold-pyrite-quartz(Ⅱ),gold-quartz-polymetallic sulfide(Ⅲ)and quartz-carbonate(Ⅳ).The main mineralization stage of gold is the second and third stages.The existence modes of gold include interstitial gold(49.87%),fissure gold(42.81%),and inclusion gold(7.31%).The size of crack gold is 7~20μm.The fineness of gold is between 886 and 943,the average fineness is 845.10,and the coefficient of variation is 11.72%.The correlation analysis results show that the most significant correlations are gold-silver and iron-sulfur.The correlation between gold and other elements is in the order of Au-Ag-Cr-Fe-S,with little correlation with Pb,Cu,Zn,etc.Pyrite is a gold bearing mineral.Gold is leached out from the ore source bed(ancient Metamorphic rock and Linglong composite rock body)and migrated as simple chlorides and complexes.Gold mineralization is concentrated in the superposition of two mineralization stages.This study provides basic data for revealing the occurrence and genesis of regional gold.
作者
史磊
王西荣
宁霄峰
鹿峰宾
许延波
李亚楠
SHI Lei;WANG Xirong;NING Xiaofeng;LU Fengbin;XU Yanbo;LI Yanan(Anhui Technical College of Industry and Economy,Hefei 230051,Anhui,China;Anhui Provincial Geological Experimental Research Institute(Hefei Mineral Resources Supervision and TestingCenter of the Ministry of Land and Resources),Hefei 230001,Anhui,China;Shandong Gold Group Geological and Mineral Exploration Co.,Ltd.,Laizhou 261400,Shandong,China;School of Environmental Studies,China University of Geosciences,Wuhan 430074,Hubei,China;Northern Engineering Design and Research Institute Co.,Ltd.,Shijiazhuang 050000,Hebei,China)
出处
《黄金科学技术》
CSCD
北大核心
2024年第1期41-54,共14页
Gold Science and Technology
基金
国家自然科学基金项目“胶东焦家断裂南延覆盖区金矿综合找矿技术研究与增储示范”(编号:2022YFC2903605-2)
安徽省教育厅自然科研重点项目“江南隆起带东段西坞口岩体含矿性与稀有金属锂的成矿关系研究”(编号:2023AH052676)联合资助。
关键词
金的赋存状态
成矿富集机制
成矿阶段
金成色
南吕—欣木金矿
occurrence state of gold
metallogenic and enrichment mechanism
metallogenic stage
gold fineness
Nanlü-Xinmu gold deposit
