使用地面光谱仪对小干沟金矿区进行了地表及深部各典型岩（矿）石主要蚀变矿物光谱数据获取，分析各光谱曲线特征。研究总结了矿区地表蚀变分带特征和深部蚀变强度变化，同时分析研究了深部蚀变延伸趋势；结合矿区地质特征、围岩蚀变特征、矿产特征，建立了构造蚀变岩型金矿床地面蚀变矿物分布模型；进而预测小干沟金矿区西侧及矿区深部蚀变矿物分布规模较大、强度较高，找矿前景较好。
Field imaging spectrometer system is used to obtain spectroscopic data of altered rocks and minerals from typical rocks(ores) in surface and deep Xiaogangou Gold Deposit ,Qinghai Province and analyze the characteris-tics of the curves .The study summarizes zoning characteristics of surface alteration and strength variation of deep alter-ation,in the meantime ,the extension trend of deep alteration is analyzed; a model concerning distribution of surface alteration mineral of structural altered rock type gold deposits is established based on the geological features ,alteration features of surrounding rocks and mineral characteristics ,which suggests that alteration mineral assemblage in the west-ern and deep parts of this deposit are not only widely distributed ,but also intensively altered ,and thus indicates a vast metallogenetic potentiality .It is guiding for mineral prospecting in late phase of mining in the district .
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