Abstract:

Hyperspectral remote sensing technology is widely used in geological prospecting. Gaofen-5 (GF-5 for short) is China’s first hyperspectral comprehensive observation satellite, which has hyperspectral resolution remote sensing data of 330 spectral segments. To improve our understanding, it is necessary to explore the application effect and potential of GF-5 space hyperspectral remote sensing technology to unveil the relevant processes in uranium geological prospecting. This study used hyperspectral data in Longshoushan metallogenic belt, Gansu Province, to carry on hyperspectral data processing and alteration information extraction study. GF-5 hyperspectral band repair was innovatively realized. By constructing standard spectral library and diagnostic spectrum, MNF algorithm, PPI algorithm and SAM spectral angle mapping technology were used to complete alteration mineral end-member extraction and spectral matching. We finally achieved the extraction of albite, calcite, quartz, chlorite, hematite and kaolin alteration minerals in our study area. Comprehensive regional uranium ore-forming geological background, by conducting ground spectrum measurement and field investigation, on the basis of accuracy verification alteration, we analyzed the space hyperspectral alteration information and metallogenic regularities, built the regional prospecting orientation model, at the same time three prospecting prediction areas were delineated, and good prospecting results were achieved. This paper provides reference for the application of GF-5 hyperspectral remote sensing in geological prospecting.

Key words: GF-5 satellite, satellite hyperspectral, alteration information extraction, alkali-metasomatism type uranium deposit, Longshoushan metallogenic belt