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Application of TerraSpec spectrometer to the study of alteration information in the Duobuza porphyry copper deposit of Tibet |
| DAI Jingjing1,2, WANG Ruijiang2, QU Xiaoming2, XIN Hongbo2 |
1. Faculty of Earth Sciences, China University of Geosciences(Beijing), Beijing 100083, China;
2. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources Chinese Academy of Geological Sciences, Beijing 100037, China |
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Abstract 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.
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| Keywords
MODIS
AIRS
pixed cloud
space maching
cloud classification
cloud phase
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Issue Date: 21 February 2013
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2013,
Vol. 25
