地质论评2026，Vol.72Issue(1)：147-160,14.DOI:10.16509/j.georeview.2025.07.015
基于红外光谱技术的湘东北黄金洞金矿床蚀变特征研究及勘查指示意义
Short wave infrared(SWIR)spectral characteristics of alteration minerals and applications for ore exploration in Huangjindong orogenic gold deposit,northeastern Hunan
摘要
Abstract
Objectives:The northeastern Hunan region within the Jiangnan Orogen hosts multiple large gold deposits,constituting a significant gold metallogenic belt in China with abundant gold resources.The Huangjindong Gold Deposit,a representative deposit in this area,features substantial reserves and high-grade mineralization.Gold mineralization in this district is closely associated with hydrothermal alteration,with common alteration minerals including sericite,siderite,and montmorillonite.As an efficient exploration technique,short wave infrared(SWIR)spectroscopy enables rapid identification of alteration mineral assemblages and their relative abundances,providing critical data support for alteration mineral mapping. Methods:Based on short wave infrared spectroscopy(SWIR),this study conducted hyperspectral scanning analyses on core samples from five drill holes in the ore vein of the Huangjindong Gold Deposit.By identifying the spectral characteristics of alteration minerals and analyzing the absorption peak position(POS2200)and crystallinity(IC value)of sericite,the spatial patterns of alteration minerals in the mining area were revealed. Results:More than 10 main alteration minerals were identified,with sericite being the dominant one.TheλPOS2200 values of sericite mainly range from 2196 to 2210 nm,and the DSWIR-IC values range from 0.05 to 1.96.The mean λPOS2200 and DSWIR-IC values of sericite in alteration zones from different drill holes show a gradually increasing trend from west to east. Conclusions:Research reveals significant spatial distribution patterns of alteration minerals across drill holes from west to east:The λ POS2200 value of sericite progressively increases,indicating enhanced acidity of vein-forming hydrothermal fluids;concurrently,sericite illite crystallinity(DSWIR-IC)gradually decreases,demonstrating declining fluid temperatures and confirming west-to-east migration of ore-forming fluids along the vein.A temperature attenuation model based on DSWIR-IC was established,pinpointing the hydrothermal center.This validates the model's efficacy in tracing hydrothermal pathways and locating mineralization centers,providing critical guidance for mineral exploration.The study offers novel insights for interpreting alteration signatures at the Huangjindong gold deposit and delivers a scientific foundation for regional prospecting strategies.关键词
短波红外光谱/湘东北/蚀变矿物/江南造山带/勘查标志Key words
short wave infrared spectroscopy/northeastern Hunan/alteration minerals/orogenic gold deposit/exploration indicators引用本文复制引用
张创业,周岳强,张云飞,吴俊,张胜伟,梅宵,孙建东,文志林,刘磊..基于红外光谱技术的湘东北黄金洞金矿床蚀变特征研究及勘查指示意义[J].地质论评,2026,72(1):147-160,14.基金项目
本文为湖南省地质院科研项目重大项目(编号:HNGSTP202302),湖南省自然科学基金资助项目(编号:2024JJ8345)及新一轮找矿突破战略行动科技支撑项目(编号:ZKKJ202408)的成果. This study is the research achievement supported by the Major Project of the Scientific Research Program of Hunan Geological Institute(No.HNGSTP202302),the Hunan Natural Science Foundation Project(No.2024JJ8345),and the Science and Technology Support Project for the New Round of Prospecting Breakthrough Strategic Action(No.ZKKJ202408). （编号:HNGSTP202302）
