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lithium-bearing Pegmatite Exploration in Western Altun,Xinjiang,using Remote-Sensing Technology

Acta Geologica Sinica(English Edition) 2023年第2期97卷 681-694页

作者： JIANG Qi DAI Jingjing WANG Denghong WANG Chenghui TIAN Shufang Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural ResourcesInstitute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China China University of Geosciences Beijing 100083China

Western Altun in Xinjiang is an important area,where lithium(li)-bearing pegmatites have been found in recent ***,the complex terrain and harsh environment of western Altun exacerbates in prospecting for li-bearing ***,remote-sensing techniques can be an effective means for prospecting li-bearing *** this study,the fault information and lithologyical information in the region were obtained using the median-resolution remotesensing image Landsat-8,the radar image Sentinel-1 and hyperspectral data *** Landsat-8 data,the hydroxyl alteration information closely related to pegmatite in the region was extracted by principal component analysis,pseudoanomaly processing and other *** high spatial resolution remote-sensing data WorldView-2 and WorldView-3 short-wave infrared images were used and analyzed by principal component analysis(PCA),the band ratio method and multi-class machine learning(ML),combined with conventional thresholds specified the algorithms used to automatically extract li-bearing pegmatite ***,the li-bearing pegmatite exploration area was determined,based on a comprehensive analysis of the faults,hydroxyl alteration lithology and li-bearing pegmatite *** investigations have verified that the distribution of pegmatites in the central part of the study area is consistent with that of li-bearing pegmatites extracted in this *** study provides a new technique for prospecting li-bearing pegmatites,which shows that remote-sensing technology possesses great potential for identifying lithium-bearing pegmatites,especially in areas that are not readily accessible.

关键词： remote sensing prospecting multi-class machine learning li-bearing pegmatites western Altun

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