高光谱蚀变矿物提取在地质找矿中的应用——以吉林某斑岩型钼矿为例

Application of Alteration Mineral Extraction base on Hyperspectral Data to Geological Prospecting of a Molybdenum Deposit in Jilin Province

国内外已广泛使用高光谱方法提取和识别岩石和矿物的技术。本文利用这个技术,在地面光谱测试、数据处理和光谱特征分析的基础上,提取和识别出斑岩钼矿区的蚀变矿物,通过分析与钼矿化蚀变的相关性,从12种主要蚀变矿物中优选出5种在矿区具有代表性的蚀变矿物:绢云母、蒙脱石、伊利石化绢云母、高岭石(结晶差)和铁镁绿泥石。结合其空间分布和分带特征,分析了与钼矿化的关系,进而划分出内、中和外三个蚀变带,预测了矿区的找矿方向,并提供了一种新的找矿思路。

The hyperspectra method for extracting and recognizing rocks and minerals has been commonly used in the world. By means of this technol- ogy, this study builds on ground spectrum test, data processing and analysis of spectrum characteristics to extract and recognize the altered minerals in a porphyry molybdenum ore district of Jilin Prorinee. Then, by analyzing the relevance of Mo mineralization with alteration,the following five representative altered minerals of this area have been selected ： sericite, montmorillonite, illite-sefieite, kaolinite （poorly crystallized） and brunsvigite. In addition,in com- bination with the characteristics of spatial distribution and zonation of those five altered minerals above,this work analyzed their relation to Mo-mineraliza- tion,and suggested that the altered belt can be further divided into inner, middle and outer zones. The results permit to predict the direction for ore-search and to provide a new line of thought for mine exploration.