摘要
胶东是中国最大的金矿集区,区内金矿床受系列NE向断裂构造控制。焦家金矿床是胶东规模最大的金矿床之一,包含焦家矿段、寺庄矿段和望儿山矿段等。由于多年来高强度的生产,矿山保有资源量快速下降,急需加强深部和外围找矿,以保证矿山的持续发展。焦家金矿床的矿化和蚀变主要受断裂构造控制,研究构造-蚀变模型和蚀变分带规律对指导深部及外围找矿具有重要意义。矿区的蚀变类型多样,从断裂构造向两侧呈现出规律性的分带特征。本研究在详细的井下地质调研、钻孔岩心编录的基础上,开展了详细的构造-蚀变剖面测量,并结合典型样品的显微岩矿相和短波红外光谱分析,建立了矿区的构造-蚀变分带模型,提出黄铁矿化、伊利石化、绢云母化与矿化关系最密切,处于断裂构造的近端;而钾长石化、绿泥石化和赤铁矿化处于断裂构造的远端,为金矿化的外围蚀变带。短波红外光谱分析(SWIR)结果表明,距离矿体位置越近白云母族矿物的Al-OH吸收特征波长(Pos2200)向长波长(Pos2200>2207 nm)偏移,同时伊利石结晶度(IC值)向高值(IC>2.0)明显偏移。可见,白云母族矿物SWIR分析对于指示金矿找矿具有重要意义。
The Jiaodong region is the largest gold-producing area in China,where gold deposits are controlled by a series of northeast(NE)-trending fault structures.The Jiaojia gold deposit,one of the largest gold deposits in the Jiaodong region,encompasses orebodies such as Jiaojia,Sizhuang,and Wang’ershan.Due to years of high-intensity mining,the residual mineral resources of the Jiaojia deposit have declined sharply,making it imperative to strengthen deep and peripheral prospecting to ensure the sustainable development of the mine.The mineralization and alteration of the Jiaojia gold deposit are mainly controlled by fault structures;therefore,studying the structural-alteration model and the zoning regularity of alteration is of great significance for guiding deep and peripheral prospecting.Various types of alteration occur in the Jiaojia deposit,showing regular zoning characteristics from the fault structure to both sides.Based on detailed underground geological surveys and drill core logging,this study carried out detailed mapping of structural-alteration profiles.Combined with micro-petrographic and mineralogical analyses of typical samples as well as short-wave infrared(SWIR)spectroscopic analysis,a structural-alteration zoning model for the Jiaojia deposit was established.The study proposes that pyritization,illitization,and sericitization are most closely related to gold mineralization and are located in the proximal zone of the fault structure;in contrast,K-feldspathization,chloritization,and hematitization are situated in the distal zone of the fault structure,serving as the peripheral alteration zones of gold mineralization.The results of SWIR spectroscopic analysis indicate that the characteristic absorption wavelength of Al-OH(Pos2200)in muscovite-group minerals and illite crystallinity(IC)have certain significance for prospecting indication.At the orebody or within the ore-hosting fault structure,they show obvious shifts toward longer wavelengths(Pos2200>2207 nm)and higher values(IC>2.0),respectively.
作者
梁培
薛文豪
蒋翔
谢玉玲
代作文
曲云伟
郭广军
于倩倩
陈晓坤
董磊磊
LIANG Pei;XUE Wenhao;JIANG Xiang;XIE Yuling;DAI Zuowen;QU Yunwei;GUO Guangjun;YU Qianqian;CHEN Xiaokun;DONG Leilei(School of Resources and Safety Engineering,University of Science and Technology(Beijing),Beijing 100083,China;Jiaojia Gold Company,Shandong Gold Mining(Laizhou)Co.,Ltd.,Laizhou 261441,Shandong,China)
出处
《大地构造与成矿学》
北大核心
2026年第1期91-111,I0019,I0020,共23页
Geotectonica et Metallogenia
基金
国家重点研发计划项目(2024YFC2909901)
国家自然科学基金项目(42103060)
山东黄金矿业(莱州)有限公司焦家金矿项目联合资助。
