基于多角度高光谱指数的花岗岩中长石含量反演研究  

Inversion of feldspar content in granite based on hyperspectral indices developed from multi-angular bidirectional reflectance

作　　者：吴梦娟 靳佳[1,2,3] 王金林 王权[5] WU Mengjuan;JIN Jia;WANG Jinlin;WANG Quan(International Joint Laboratory of Ecology&Remote Sensing,Nanning Normal University,Nanning,Guangxi 530001,China;Key Laboratory of Environment Change and Resources Use in Beibu Gulf(Nanning Normal University),Ministry of Education,Nanning,Guangxi 530001,China;Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulated(Nanning Normal University),Nanning,Guangxi 530001,China;Xinjiang Key Laboratory of Mineral Resources and Digital Geology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,Xinjiang 830011,China;Faculty of Agriculture,Shizuoka University,Shizuoka 422-8529,Japan)

机构地区：[1]南宁师范大学生态与遥感国际联合实验室,广西南宁530001 [2]南宁师范大学北部湾环境演变与资源利用教育部重点实验室,广西南宁530001 [3]南宁师范大学广西地表过程与智能模拟重点实验室,广西南宁530001 [4]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011 [5]静冈大学,日本静冈422-8529

出　　处：《地质学报》2024年第1期314-323,共10页Acta Geologica Sinica

基　　金：广西科技基地和人才专项(编号桂科AD22035922);新疆重大科技专项(编号2021A03001-3)联合资助的成果。

摘　　要：花岗岩中长石含量的定量估算有助于其定名和分类,为后续相关地质过程研究提供基础数据。在可见光—近红外—短波红外波段范围内(0.35~2.5μm),传统基于光谱吸收特征参数反演矿物种类和含量的方法,不适用于像长石这类无诊断性吸收特征的矿物。同时,基于物理的辐射传输模型由于计算复杂,在较大程度上限制了该方法在矿物定量反演中的应用。本文基于多角度高光谱数据,通过不同光谱预处理方法及光谱指数类型的组合实验,创建用于估算花岗岩中长石比例的光谱指数模型。结果表明,使用2035 nm波段的反射率二重差分型(CRDDn_(2035))指数模型,在不同实测数据集中均具有良好表现,估算精度达到0.81。本研究创建了一种适用于估算长石占比的光谱指数模型,为定量反演具有弱吸收特征的岩矿信息提供了新的技术手段与思路。The quantitative estimation of feldspar content in granites is helpful for the naming and classification of granites,and it provides basic data for subsequent studies on related geological processes.However,within the visible near-infrared to short-wave infrared range(0.35~2.5μm),the traditional method of inverting rock types and mineral contents based on spectral absorption characteristic parameters is not suitable for minerals such as feldspar that lack diagnostic absorption characteristics.At the same time,the complexity of calculating the radiative transfer model based on physics limits the application of this method to a large extent in the inversion of rock mineral properties.In this paper,we establish a spectral index model for estimating the proportion of plagioclase to feldspar in granite based on multi-angle hyperspectral data.By combining different spectral preprocessing methods and spectral index types,we aim to overcome these limitations.Our results show that the double differences type index model,utilizing the measured dataset with continuum removal at the 2035 nm band(CRDDn_(2035)),demonstrates good performance across different measured datasets,achieving an estimation accuracy of 0.81.Through the study,we establish a spectral index model for estimating the proportion of plagioclase in granite,providing a new technical method and idea for the quantitative inversion of rock and ore information with weak absorption characteristics.

关 键 词：多角度高光谱数据 光谱指数 花岗岩中长石定量反演 Hapke模型 

分 类 号：P627[天文地球—地质矿产勘探]