山地高原斑岩型铜矿矿化蚀变分带遥感弱异常光谱响应及增强提取研究

Porphyry-type copper deposit which output in Mountain Plateau has typical mineralization alteration zonings characteristics,but the remote sensing spectral response mechanism of porphyry-type copper mineralization alteration zoning weak anomaly is still unclear.With the effect of the complex geological background of Mountain Plateau, the effective remote sensing information enhanced extraction model to understand the mineralization alteration zonings in detaied is lack as well. To solve the aboved scientific difficult problem in the remote sensing geology research frontier,this proposal intends to select Pulang porphyry-type copper deposit as study area, analyzing the spectral response feature of porphyry-type copper mineralization alteraion zonings comprehensively, combined with the large field rock spectroscopic measurements under different geological backgrounds,laboratory spectral identification and analysis of rock and mineral，to obtain the spectral response of porphyry-type copper mineralization alteration zonings under complex geological backgrounds；Then the spectral response of porphyry-type copper mineralization alterations in ASTER spectrum will be researched furhter.With the multifractal theory and methods introduced in this study, the model of remote sensing information enhanced extraction for porpyry-type copper mineralization alteration zoning weak anomalies will be constructed. In a word, the expected research outputs may help us to understand the academic remote sensing spectral response mechanism of porphyry-type copper mineralization alteration zoning weak anomaly under complex geological background deeply,and to improve the effective construction of the remote sensing information enhanced extraction model for porphyry-type copper mineralization alteration zonings in Mountain Plateau,which will supply the scientific support to improve the accuracy of Pulang porphyry-type copper mineral prospecting in Northwestern Yunnan.

山地高原区斑岩型铜矿矿化蚀变分带特征明显，但其矿化蚀变分带弱异常的遥感光谱响应机理尚不清楚，加之山地高原区地质背景复杂，给斑岩型铜矿矿化蚀变分带遥感精细化提取模型构建带来了影响。为解决前述遥感地质前沿研究难题，本项目拟选取滇西北普朗斑岩型铜矿进行剖析，围绕斑岩型铜矿的矿化蚀变分带特点，通过大样本实地岩矿光谱测量、结合室内岩矿鉴定分析，剖析复杂地质背景条件下斑岩型铜矿矿化蚀变分带弱异常光谱响应特征；分析斑岩型铜矿矿化蚀变分带光谱响应在ASTER遥感数据中的表现，并引进多重分形等理论与方法，优化构建山地高原区斑岩型铜矿矿化蚀变分带弱异常遥感精细化分层提取模型。研究成果不仅将深化复杂地质背景下斑岩型铜矿矿化蚀变分带弱异常光谱响应机理认识，提升斑岩型铜矿矿化蚀变分带弱异常遥感增强提取模型构建研究水平，还将为提高滇西北普朗铜矿找矿精度提供科学依据。

本项目选取山地高原具有复杂地质背景的滇西北普朗斑岩型铜矿区，采用购买的Aster遥感影像数据，首先系统开展了地形阴影、植被、第四系覆盖、冰雪、水系等复杂地质背景条件解译，分析和总结了普朗矿区复杂地质背景条件空间分布状况及其由内向外呈钾化硅化—绢云母化—青盘岩化典型矿化蚀变分带特征；通过实地采集488个大样本的光谱测量和室内岩矿鉴定分析，建立了普朗矿区的光谱数据库及岩矿鉴定成果数据库，并采用回归分析的方法厘定了矿物含量与光谱特征参数（光谱吸收指数）之间的关系，揭示了复杂地质背景下斑岩型铜矿矿化蚀变分带（特征矿物）弱异常光谱响应机理；创新性引入分形多重分形理论，构建了基于“PCA+S-A”法复杂地质背景下斑岩型铜矿矿化蚀变分带（特征矿物）弱异常遥感信息增强提取模型，并对Aster数据和Worldview-3数据普朗斑岩型铜矿矿化蚀变分带特征矿物石英、绢云母、绿泥石、绿帘石的遥感蚀变异常信息提取精度进行了实验对比分析，结果表明基于Worldview-3数据的提取精度比基于Aster数据的提取精度提高了8.15%；根据提取的遥感蚀变异常信息，通过深入剖析及野外验证，推测普朗已开采矿区东侧存在一条成控矿构造，东侧还存在一个矿化蚀变异常浓集中心，目前位于构造西侧的主矿区原与构造东侧部分连为一体，受该正断层上盘下滑而形成，在普朗矿区东侧区域重新划分的钾化硅化带及绢英岩化带交界处存在较大找矿潜力。研究成果较好地深化了普朗斑岩型铜矿矿化蚀变异常遥感响应机理，并为普朗铜矿进一步找矿突破提供重要依据。.项目资助发表SCI论文1篇,中文核心期刊论文2篇，公开期刊论文1篇，正在投稿SCI论文4篇。参加国内外学术交流4次。培养硕士研究生3人，均已取得硕士学位，其中1人博士在读；培养本科生3人，项目投入经费53万元，支出297932.1元，各项支出基本与预算相符，剩余经费232067.9元，计划用于本项目研究后续支出。