西澳大利亚伊尔加恩金矿遥感找矿模型  

Prospecting Model for Gold Deposits in Yilgarn,Western Australia

作　　者：赵静[1] 苏程[1] 王习之[1] 黄智才[1] 章孝灿[1] 

机构地区：[1]浙江大学空间信息技术研究所,杭州310027

出　　处：《遥感信息》2016年第1期69-76,共8页Remote Sensing Information

基　　金：中国地质调查局地质调查项目(1212011120340);国土资源部公益性行业科研专项(201211013-3)

摘　　要：针对利用主成分分析法提取围岩矿化蚀变信息中信息量较少的问题,提出了一种基于局部约束的主成分分析方法。该方法根据已知背景知识选取矿产资源较为集中的区域,以样本区方式计算主成分变换参数,以此获取较强的围岩矿化蚀变信息增强模式,进而推广至整个研究区建立找矿模型。将本文方法应用在西澳大利亚南部伊尔加恩地块的中东部北北东向密集成束的裂谷相绿岩地层,使用ASTER数据提取了含羟基矿物蚀变(绿泥石化、绢云母化)和铁染蚀变,并在此基础上建立金矿找矿模型,划定了20个矿化蚀变异常区域,并对其分布特征、地质背景及矿产资源相关关系进行了分析与总结。最终综合分析该研究区内典型绿岩型金矿的岩性、构造及蚀变异常分布等特征,圈定了4处找矿靶区。To increase the proportion of weak alteration information in information extraction,a principal component analysis （PCA） with local constrains approach was proposed in this paper. This approach first selected the area of densely distributed minerals by background knowledge, and calculated the parameters of PCA with sample area, so as to obtain the exaggerating model of the mineralized alteration, then applied the pertinence PCA model in the whole area to enhance the weak alteration information. The approach was applied in the dense and fascieular rift phase greenstone along NNW direction of the eastern Yilgarn block,Western Australia,to analyze the mineral containing Hydroxyls and Fe ion using ASTER remote sensing data, and build the model for prospecting. Twenty alteration areas were delineated through the geological background and mineral alteration mapping results. On this basis, comprehensive considering the characteristics of lithology, structure and alteration anomalies of the typical greenstone type gold deposits in the study area,four gold prospecting targets were finally delineated.

关 键 词：伊尔佳恩 金矿 矿化蚀变 找矿模型 主成分分析 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] TP79[自动化与计算机技术—控制科学与工程]