鄂西水月寺地区Landsat8-OLI遥感蚀变信息与地球化学奇异性异常信息融合应用  

Integrated application of alteration information from Landsat8-OLI remotesensing images and geochemical singularity anomaly informationfor the Shuiyuesi area of western Hubei Province

作　　者：保其兵 杨朋 周舟 雷雳 夏庆霖 刘银 龚银 卢金祥 BAO Qi-Bing;YANG Peng;ZHOU Zhou;LEI Li;XIA Qing-Lin;LIU Yin;GONG Yin;LU Jin-Xiang(Cores and Samples Centre of Natural Resources,China Geological Survey,Langfang 065201,China;School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430084,China;The Seventh Geological Brigade of Hubei Geological Bureau,Yichang 443100,China)

机构地区：[1]中国地质调查局自然资源实物地质资料中心,河北廊坊065201 [2]中国地质大学(武汉)资源学院,湖北武汉430084 [3]湖北省地质局第七地质大队,湖北宜昌443100

出　　处：《物探与化探》2024年第5期1302-1312,共11页Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目(DD20242250、DD20230138、DD20221814);湖北省综合性地质区划(鄂西片)项目(KCDZ2022-07);湖北省成矿区划与矿产前期勘查(鄂西片)项目(KCDZ2023-20)。

摘　　要：鄂西经历了长期剧烈的岩浆热液活动以及区域变质作用,为金矿形成提供了有利的条件。近年来,水月寺地区随着地表矿、露头矿逐渐勘查殆尽,金矿找矿工作正向覆盖区和深部等新领域拓展,由于该区地形起伏较大,植被覆盖率较高,地形切割严重,找矿难度不断增大,急需一套高效的找矿思路实现找矿突破。本文通过地质调查分析,统计水月寺金矿区9条金矿脉与金矿化关系密切的蚀变类型,利用数值运算等方法对Landsat8-OLI遥感影像进行蚀变信息提取,并利用多元统计分析、局部奇异性分析等方法提取元素分布的弱异常信息,通过数据融合技术实现遥感蚀变异常信息与奇异性异常信息的融合,结合成矿地质背景、成矿规律等综合信息划分出19个成矿远景区,在杨家淌—财神庙等地发现新的异常线索。通过奇异性分析和数据融合相结合的新思路,不但提高了地球化学异常空间的分辨率,丰富了地物空间细节,而且增强了与金矿化有关的弱异常信息,能够快速、高效地识别、提取综合异常和预测找矿远景区。Prolonged intense magmatic-hydrothermal activity and regional metamorphism in western Hubei Province created favorable conditions for the formation of gold deposits.As the Shuiyuesi area witnessed a thorough exploration of surface and outcrop mines,the prospecting of gold deposits in the area has shifted to overburden and deep zones in recent years.However,the prospecting in the Shuiyuesi area becomes gradually complicated due to significant topographic relief,high vegetation coverage,and severe terrain cutting.Hence,efficient prospecting approaches are urgently needed to achieve breakthroughs in ore prospecting.Through geological survey and analysis,this study statistically analyzed the alteration types intimately associated with gold mineralization in nine gold veins of the Shuiyuesi area.It extracted alteration information from Landsat8-OLI remote sensing images using methods like numerical operations,and weak anomaly information of element distribution using methods like multivariate statistical analysis and local singularity analysis.Employing the data integration technology,it integrated the alteration anomaly information from remote sensing images and the singularity anomaly information.Based on comprehensive information,such as geological settings for mineralization and metallogenic regularity,this study identified 19 metallogenic prospect areas and new anomaly clues in the Yangjiatang-Caishenmiao area.The novel approach combining singularity analysis and data integration enhanced the spatial resolution of geochemical anomalies,the spatial details of surface features,and weak anomaly information associated with gold mineralization,thus enabling rapid and efficient identification and extraction of comprehensive anomalies and prediction of metallogenic prospect areas.

关 键 词：地球化学异常 遥感蚀变异常 数据融合 远景区预测 

分 类 号：P632[天文地球—地质矿产勘探]