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Geoscience ›› 2024, Vol. 38 ›› Issue (04): 1076-1091.DOI: 10.19657/j.geoscience.1000-8527.2023.112

• Ore-controlling Mechanism and Exploration Applications of Tectono-physicochemistry • Previous Articles     Next Articles

Remote Sensing Geological Interpretation, Alteration Information Extraction, and Mineral Prospecting Prediction in the Chaihulanzi Gold Field, Chifeng, Inner Mongolia

HAN Yaohui1,2(), WANG Cuizhi1(), WU Zhijie2, LÜ Guxian3, ZHANG Baolin4, ZHANG Qipeng5   

  1. 1. Zijin School of Geology and Mining, Fuzhou University, Fuzhou,Fujian 350108,China
    2. Department of Resources Engineering, Longyan University, Longyan, Fujian 364012,China
    3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081,China
    4. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,China
    5. Inner Mongolia Mining Development Co., Ltd., Huhhot, Inner Mongolia 010020, China
  • Online:2024-08-10 Published:2024-10-16
  • Contact: WANG Cuizhi

Abstract:

The Chaihulanzi gold field, situated at the northwesternmost end of the Chifeng-Chaoyang gold metallogenic belt, is an significant gold-producing region in China.However, this region faces harsh natural conditions and has seen limited geological studies using remote sensing.Research on the distribution characteristics of key ore-controlling factors (e.g., strata, structures, and igneous rocks) and alterations of host rocks related to gold mineralization remains relatively scarce.Therefore, utilizing remote sensing technology for prospecting in this ore field is of great significance.This paper uses Landsat 8 and GF-2 remote sensing images, along with the “Principal Component Analysis+Optimal Index Factor” method, to perform remote sensing geological interpretation of the Chaihulanzi gold ore field in Songshan District, Chifeng City, Inner Mongolia.Based on the spectral characteristics of altered minerals, a scheme was developed to extract alteration information from Landsat 8 and Sentinel-2A remote sensing images.The scheme involves removing interference information, extracting anomaly information, grading anomalies, and processing anomaly data.Three prospecting target areas were delineated based on previous regional geological and mining studies, integrating characteristics of alteration information with geological interpretation results.This study shows that using multi-source remote sensing satellite images for geological interpretation and extracting alteration information in the study area generally meets the requirements for medium-scale prospecting prediction and comprehensive geological surveys, significantly enhancing prospecting efficiency.The research results provide crucial fundamental guidance for future prospecting and exploration in the Chaihulanzi gold ore field.

Key words: Chaihulanzi gold ore field, multi-source remote sensing satellite imagery, remote sensing interpretation, alteration information extraction, principal component analysis, ore prospecting prediction

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