江西德兴矿集区遥感蚀变异常信息提取及找矿指示意义  

The Extraction of Remote Sensing Alteration Anomalies and Its Prospecting Indication in the Dexing Ore Concentration area in Jiangxi Province

作　　者：冯依琳 郑忠超 王旭东 华嵘辉 代晶晶[3,4] 廖小武 黄鸿新 FENG Yilin;ZHENG Zhongchao;WANG Xudong;HUA Ronghui;DAI Jingjing;LIAO Xiaowu;HUANG Hongxin(School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083;No.8 Geological Brigade of Jiangxi Geological Bureau,Shangrao,Jiangxi 334000;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;State Key Laboratory of Deep Earth and Mineral Exploration,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100094)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]江西省地质局第八地质大队,江西上饶334000 [3]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [4]中国地质科学院矿产资源研究所深地探测与矿产勘查全国重点实验室,北京100094

出　　处：《地质与勘探》2025年第2期256-267,共12页Geology and Exploration

基　　金：江西省科学技术厅“科技+地质”联合计划项目“江西铜矿资源预测与找矿突破技术研究”(编号:2023KDG01001);国家自然科学基金面上项目(编号:42172332);中国地质科学院基本科研业务费专项经费(编号:JKYZD202405)联合资助。

摘　　要：近年来,随着国内外对地观测技术的不断进步,遥感技术已逐渐成为地质调查和矿产资源勘查等领域的重要技术手段之一。卫星遥感技术可以快速获取大范围的蚀变异常信息,服务于区域后续找矿勘查。本文针对江西德兴矿集区及其外围,基于Landsat-8OLI多光谱数据和GF-5AHSI高光谱数据,提取了矿集区及其外围区域的遥感蚀变异常信息,分析了区内蚀变异常分布特征,圈定了成矿有利地段。基于Landsat-8OLI数据采用主成分分析方法提取出了铁染类、羟基类蚀变异常信息;基于GF-5AHSI数据采用混合调谐匹配滤波法提取出了云母、碳酸盐、绿泥石蚀变矿物信息。结合德兴矿集区地质资料,对比分析了两类遥感数据提取的蚀变异常信息分布情况,揭示了该地区发育斑岩成矿体系典型的蚀变分带特征,具体表现为从中心向外围逐渐由绢英岩化带过渡到青磐岩化带。在此基础上,圈定了2处找矿有利地段,分别位于德兴斑岩铜矿北部及银山矿床东南部。经野外实地验证,这2处找矿有利地段发育大面积铁染类蚀变异常,且地表采集的岩块样品显示,区内广泛分布的以千枚岩为主的双桥山群浅变质岩系发育绢云母化、绿泥石化,与卫星遥感数据蚀变异常提取结果有较好的对应关系。该研究结果表明该区域具有进一步寻找斑岩型矿床的找矿潜力,为该地区后续找矿勘查工作提供了重要的遥感判据。In recent years,with the continuous advancement of domestic and international earth-observation technologies,remote sensing technology has emerged as a crucial tool in geological surveys and mineral resource exploration.The satellite-based remote sensing technology enables the rapid acquisition of large-scale alteration anomaly information,which will aid to subsequent regional mineral exploration endeavors.This study focuses on the Dexing ore concentration area and its surrounding areas in Jiangxi Province.Based on Landsat-8 OLI multispectral data and GF-5 AHSI hyperspectral data,remote sensing alteration anomalies were extracted for the ore concentration area and its surrounding regions.We analyzed the distribution characteristics of alteration anomalies in the area,and delineated favorable metallogenic sections.Through principal component analysis(PCA)on Landsat-8 OLI data,iron-stained and hydroxyl alteration anomalies were extracted.The mixed-tuned matched filtering(MTMF)method was applied to GF-5 AHSI data to extract alteration minerals such as mica,carbonate,and chlorite.By integrating geological data from the Dexing ore concentration area,the distribution of alteration anomalies extracted from the two types of remote sensing data was compared and analyzed,revealing typical alteration zoning characteristics of a porphyry metallogenic system in the region.Specifically,the alteration zones transition from a phyllic zone in the center to a propylitic zone towards the periphery.Based on this,two favorable prospecting sections were delineated,which were located north of the Dexing porphyry copper deposit and southeast of the Yinshan deposit.Field verification confirmed that these two sections exhibited large-scale ironstained alteration anomalies.Surface rock samples collected in the area indicate widespread sericitization and chloritization in the shallow metamorphic rock series of the Shuangqiaoshan Group,primarily composed of phyllite,which corresponds well with the alteration anomaly extraction results from s

关 键 词：蚀变矿物 Landsat-8 GF-5 高光谱 斑岩铜矿 德兴矿集区 江西 

分 类 号：P627[天文地球—地质矿产勘探] P619.215[天文地球—地质学]