摘要
三山岛断裂带蚀变岩型金矿床控矿断裂产状变化部位含矿性存在差异,使得矿体不连续,勘查标识不明确。通过对三山岛北部海域金矿床30号勘探线的多个钻孔和三山岛井下坑道进行系统编录和样品采集,研究矿物共生组合与矿脉之间的穿切关系。研究表明:北部海域金矿床可划分为4个成矿阶段,即石英—黄铁矿—钾长石阶段(Ⅰ)、石英—黄铁矿—黄铜矿—自然金阶段(Ⅱ)、石英—黄铁矿—方铅矿—闪锌矿—自然金阶段(Ⅲ)和贫矿菱铁矿—方解石阶段(Ⅳ),其中Ⅱ和Ⅲ阶段是金的主要成矿阶段。利用短波红外光谱对控矿断裂含矿和贫矿部位样品进行分析,发现蚀变矿物组成、Al-OH吸收峰位和结晶度(IC)等存在明显差异,高的Pos2200和IC值与金矿体之间存在明确的正相关关系。对各钻孔的品位数据进行统计分析后,引入机器学习算法进行分析,强调IC值具有更高的权重影响。黄铁矿微量元素研究显示:As、Pb、Bi、Te和Sb等元素与Au元素含量之间具有显著正相关性。由此,基于断裂产状、短波红外光谱指标和黄铁矿元素含量等变化情况,建立了全新的勘查标识,对实际找矿勘查工作具有指导意义。
The Jiaodong Peninsula represents the largest gold orefield in China and ranks as the third largest globally,with orebodies predominantly controlled by fault structures.The mineralization of gold deposits within the Sanshandao fault zone exhibits variability attributable to alterations in the controlling fault structures,leading to disparities in ore body continuity and ambiguous exploration indicators.This study systematically cataloged and sampled multiple drill holes and underground tunnels along exploration line 30 in the Beibuhaiyu and Sanshandao gold deposits.Based on the paragenetic associations of minerals and the cross-cutting relationships among ore veins,the gold deposits in the northern sea area can be categorized into four distinct metallogenic stages:quartz-pyrite-potassium feldspar(stageⅠ),quartz-pyrite-chalcopyrite-native gold(stageⅡ),quartz-pyrite-galena-sphalerite-native gold(stageⅢ),and barren siderite-calcite(stageⅣ).Notably,stageⅡand stageⅢrepresent the primary metallogenic phases for native gold.The analysis of ore-bearing and barren sections of controlling faults through shortwave infrared spectroscopy has demonstrated substantial differences in alteration mineral composition,Al-OH absorption peak positions,and crystallinity index(IC).Notably,elevated Pos2200 and IC values exhibit a strong positive correlation with gold mineralization.Furthermore,statistical evaluation of grade data from multiple drill holes,augmented by machine learning algorithms,underscores the significant influence of IC values.The analysis of trace elements in pyrite revealed substantial positive correlations among elements including arsenic(As),lead(Pb),bismuth(Bi),tellurium(Te),antimony(Sb),and,gold(Au).Consequently,this study has established a novel exploration indicator grounded in variations in fault attitude,shortwave infrared spectroscopy markers,and pyrite elemental,commposition.This indicator holds considerable significance for informing practical prospecting efforts.
作者
李健
宋明春
王昌伟
王润生
雷鸣
崔庆意
李杰
李世勇
Jian LI;Mingchun SONG;Changwei WANG;Runsheng WANG;Ming LEI;Qingyi CUI;Jie LI;Shiyong Li(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,Shandong,China;Hebei Key Laboratory of Strategic Critical Mineral Resources,College of Earth Sciences,Hebei GEO University,Shijiazhuang 050031,Hebei,China;Shandong Zhengyuan Geological Resources Exploration Co.,Ltd.,Zibo 255000,Shandong,China;Shandong Institute of Geophysical and Geochemical Exploration,Jinan 250013,Shandong,China;Shandong Province Nuclear Industry Geological Group 273,Yantai 264000,Shandong,China)
出处
《黄金科学技术》
CSCD
北大核心
2024年第5期749-767,共19页
Gold Science and Technology
基金
国家自然科学基金NSFC-山东省联合基金项目“胶东深部金矿断裂控矿机理”(编号:U2006201)
山东省自然科学基金项目“胶东半岛东部岩浆活动与金成矿作用的响应——以金青顶矿床为例”(编号:ZR2021QD056)
河北省人才项目“冀北地区金成矿系统及深部找矿技术”(编号:HBQZYCXY0010)联合资助。
关键词
短波红外光谱分析
勘查标识
断裂控矿模式
三山岛断裂
胶东半岛
shortwave infrared spectroscopy analysis
exploration identification
fault-controlled mineralization model
Sanshandao fault
Jiaodong Peninsula
