Lithologic Mapping and Alteration Information Extracting Based on ASTER Spectral Signature: An Example from Nianzha Gold Deposit
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摘要: 基于ASTER光谱特征进行岩性解译和蚀变信息提取在找矿勘查方面有着广泛应用，但在国内鲜有报道。以雅鲁藏布江缝合带念扎金矿为研究区，通过对与Fe3+、Fe2+、Al-OH、Mg-OH、硅酸盐、碳酸盐等成分相关特征的矿物光谱特征分析，运用“波段比值法+假彩色合成法”进行细致的岩性单元分类与地质填图，运用“地质遥感剖面+最优密度分割法”定量圈定与矿化有关的蚀变带范围，结合已有的控矿构造信息，提供推测找矿有利区2处。研究结果表明，基于ASTER光谱特征的岩性填图和蚀变信息提取方法进行找矿预测，在西藏高海拔地区具有天然的适用性，可以准确指示岩性和蚀变的关键找矿标志，是西藏地区快速有效找矿勘查的重要手段，也为区带内其他相同类型的金矿床研究提供借鉴。Abstract: Lithologic interpretation and alteration information extracting based on ASTER spectral analysis have been widely used in ore exploration.The authors carried out the study in Nianzha gold deposit of Yarlung Zangbo suture zone.Minerals components such as Fe3+, Fe2+, Al-OH, Mg-OH, silicate and carbonate were analyzed based on ASTER spectrum. This paper used "band radio method + false color synthesis" for lithologic classification and geological mapping and quantitatively delineated the range of mineralization-relatedalteration zone and two prospecting target areas with the "geologic-remote sensing profiles + best density seperation method". The results show that lithological mapping and alteration information extracting based on aster spectral are suitable for prospecting prediction in high altitude areas of Tibet, which can accurately indicate the key prospecting indicators of lithology and alteration.It proves to be an important means of rapid and effective ore exploration in Tibet, and provides reference for other deposits of the same type in the belt.
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