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| Hyperspectral Prospecting Enlightenment of the Luobu Mineralization Site in Tibet |
| DAI Jing-jing1, 2*, LIU Zhi-bo2*, BAI Long-yang2, SONG Yang1, 2, WANG Nan2, CHEN Wei1, 2, YUAN Chang-jiang3 |
1. State Key Laboratory of Deep Earth and Mineral Exploration, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100094, China
2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
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Abstract The Gangdise Metallogenic Belt is one of the important copper polymetallic metallogenic belts in Tibet, which develops multi-stage key mineralization events and is characterized by a collisional environment porphyry copper-polymetallic deposits. The research initially reveals the potential of prospecting in the Luobu area based on satellite hyperspectral Gaofen-5 technology. Grid sampling on the surface was carried out for short-wave infrared measurement and refined alteration mapping by ground hyperspectral technology and X-ray fluorescence spectrum, which could contribute to revealing the deep prospecting direction in the Luobu area. The research findings are as follows: (1) The result of satellite hyperspectral shows that the Luobu area is mainly characterized by large-scale advanced argillaceous alteration, which indicates its potential for prospecting porphyry-high-sulfur epithermal deposits. (2) The surface alteration minerals assemblage in Luobu shows five types, including pyrophyllite-disapore-dickite, alunite-kaolinite-muscovite, muscovite-kaolinite-dickite, chlorite-kaolinite, and carbonate alteration; (3) The shift of the diagnostic characteristic peak position of Al-OH in alunite and the crystallinity of white mica group minerals can indicate the changes with the temperature, pressure, and acidity-alkalinity of ore-forming fluid, and then indicate the direction of the hydrothermal center. The comprehensive results of -the geological background, the short-wavelength infrared spectrum of altered minerals, and the superposition of X-ray fluorescence spectrum anomalies have revealed two potential areas for searching for a hydrothermal center in Luobu, which can provide theoretical references for subsequent deep exploration.
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Received: 2025-01-24
Accepted: 2025-07-07
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Corresponding Authors:
DAI Jing-jing, LIU Zhi-bo
E-mail: daijingjing863@sina.com；geoleo@163.com
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