Earth Science Frontiers ›› 2023, Vol. 30 ›› Issue (5): 205-215.DOI: 10.13745/j.esf.sf.2023.5.19

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Spectral reflectance study of the Jing’erquan pegmatite lithium deposit, Xinjiang

WANG Shanshan2,3,4,5(), ZHOU Kefa1,5,*(), BAI Yong2,3,4,5, LU Xuechen2,3,4, JIANG Guo2,3,4,5   

  1. 1. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China
    2. State Key Laboratory of Desert and Oasis Ecology/Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, ürümqi 830011, China
    3. Xinjiang Research Centre for Mineral Resources, Chinese Academy of Sciences, ürümqi 830011, China
    4. Xinjiang Key Laboratory of Mineral Resources and Digital Geology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, ürümqi 830011, China
    5. University of Chinese Academy of Sciences, Beijing 100076, China
  • Received:2022-12-10 Revised:2022-12-31 Online:2023-09-25 Published:2023-10-20
  • Contact: ZHOU Kefa

Abstract:

The widely distributed pegmatite lithium deposits are the main source of lithium for industrial applications in China. The Jing’erquan lithium deposit, Xinjiang, is the largest pegmatite lithium deposit in the eastern Tianshan orogenic belt of Central Asia with great rare-metal resource potential. In this study, spectral reflectance extending from 400 to 2500 nm are obtained for rock and mineral specimens from the Jing’erquan lithium deposit, using ASD portable field spectrometer. The spectral reflectance characteristics of granite, mineral-bearing pegmatites, simple pegmatites, muscovite, spodumene, lematolite, etc., are analyzed. The study show that the 1913 nm spectral band can be used as a key band to identify lithium-bearing pegmatites. Based on the spectral characteristics of rocks and minerals, lithium deposits are compared between Jing’erquan, eastern Tianshan, and western Altun and Dahongliutan, western Kunlun, Xinjiang, and Jiajika, Sichuan, which show that the characteristic absorption wavelengths for lithium-bearing pegmatites in the four deposits differ by 1-4 nm. This study provides a theoretical basis for remote sensing mapping and geological prospecting of pegmatite lithium deposits in general.

Key words: pegmatite lithium deposits, spectral analysis, spectral absorption parameters, spodumene, Jing’erquan lithium deposit

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