The Duobuza deposit in Gaize of Tibet is one of the large - size porphyry copper deposits in Bangong Lake - Nujiang River mineralization zone found in recent years. The study of this typical deposit can provide good understanding for mineral deposit prognosis of this mineralization zone. In this paper, the spectra of samples in the Duobuza deposit were measured by using USA TerraSpec spectrometer, and at the same time, the microscopic identification of the samples was conducted. The results show that the main alterations in this deposit are phyllic alteration and epidotization, and the main mineralizations on the surface include limonite, malachite and azurite. The spectra of two kinds of granodiorite - porphyry are different. The spectrum of granodiorite - porphyry related to mineralization shows distinct phyllic alteration, and the spectrum of granodiorite - porphyry which is not related to mineralization shows little or non alteration, distributed around the first kind of granodiorite - porphyry. The spectra of the samples measured by using TerraSpec are consistent with the spectra of ASTER image. Finally, the phyllic alteration area which has close relationship with the mineralization was delineated based on the spectral analysis, and these areas are considered to be more important prospecting areas in the future.%西藏改则县多不杂矿区为近年来在班公湖—怒江成矿带发现的大型斑岩铜矿区,对这一典型矿床的研究有助于对整个班公湖—怒江成矿带提出更好的找矿认识.使用美国TerraSpec便携式地物波谱仪对从多不杂矿区采集的地物样品进行波谱测试及镜下鉴定,确定矿区主要蚀变为绢英岩化及绿帘石化,地表矿化主要有褐铁矿化、孔雀石化和蓝铜矿化.矿区出露的2套花岗闪长斑岩的波谱特征存在明显差异,成矿斑岩绢英岩化蚀变较为严重；而不成矿斑岩基本无蚀变,主要零星分布在成矿斑岩的外围.对采样样品实测波谱特征与其在ASTER图像上的波谱特征的对比分析表明,两者具有良好的一致性.最后基于采样样品波谱特征,圈定了与成矿相关的绢英岩化区域,并建议绢英岩化区域为今后矿产勘察重点区域.
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