Mapping Lithium-Bearing Pegmatite With Short-Wave Infrared (SWIR) Hyperspectral Imaging of Jingerquan Li-Be-Nb-Ta Pegmatite Deposit, Eastern Tianshan, NW China
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING(2024)
摘要
Lithium (Li) is growing in importance and demand in several industrial applications, such as portable electric devices, electric vehicles, and hybrid electric vehicles. Li-rich pegmatites are one of the main sources of Li production in the world, so low-cost and high-efficiency exploration using remote sensing has become an important means for promoting the discovery of Li resources. Although imaging spectroscopy has great potential for Li-rich pegmatites identification and regional delineation, due to the limitations of resolution and data acquisition, the exploration of the Earth's surface at various scales on a variety of platforms requires further research. The purpose of this study is to use a ground-based HySpex imaging hyperspectrometer to map pegmatite zones directly, developing a new approach for mineralized pegmatite exploration. To achieve this, we present the minimum wavelength mapper (MWM), which combines the position and depth information of the deepest absorption feature, to give a per-pixel overview map of the Jingerquan Li-Be-Nb-Ta pegmatite deposit pit and heap. The results show that images between 2100 and 2450 nm provide useful information about mineral assemblages that display strong spectral features, such as Li-rich pegmatites, Li-poor pegmatites and alteration, and their spatial distribution at the surface in areas covered by the imagery. The wavelength position and the depth of Al-OH can provide an overview of the mineral assemblages and abundances, to rapidly classify possible regions of interest for further analysis.
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关键词
Minerals,Hyperspectral imaging,Belts,Absorption,Geology,Rocks,Imaging,HySpex,lithium (Li)-bearing pegmatite,minimum wavelength mapper (MWM)
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