Spectral Characteristics and Implication of Granite from Pozaiying Molybdenite Deposits in West of Guangdong
AN Yan-fei1, 2, ZHONG Li-li1, 2, ZHOU Yong-zhang1, 2, CHEN Qing2, 3, LI Xing-yuan1, 2
1. Department of Earth Science, Sun Yat-Sen University, Guangzhou 510275, China 2. Key Lab of Geological Process and Mineral Resource Survey of Guangdong Province, Guangzhou 510275, China 3. Guangdong Vocational College of Environmental Protection Engineering, Foshan 528216, China
Abstract：Some granite samples from Pozaiying molybdenite deposits in the west of Guangdong were retrieved to characterize the spectral signature of XRD, FT-NIR and Raman. The results show that compared to the Porphyry granite and granite in the far zone, the signal of XRD and Raman of granite in near zone is weaker while the signal of FT-NIR is stronger. The authors’ analyses indicate that the FWHM of quartz (101) peak in XRD, Sericite peak (4 529 cm-1) in FT-NIR and quartz peak in Raman shift from the latter are higher than those of former two. Those spectral characteristics indicate that compared with other samples, the content of petrogenetic mineral in samples from near zone is lower while the content of alteration mineral is higher, and its crystallinity and crystallization temperatures are both lower. The authors’ studies suggest that there may be an alteration zone, embracing the granite-porphyry, which comprised low temperature mineral. and the quartz-porphyry which related to molybdenite mineralization belongs to the zone near Guanshanzhang mass.
Key words：FT-NIR;Raman;Pozaiying;Porphyry Molybdenite deposits;Qin-hang belt
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