Citation: | CHENG Sanyou, YANG Xingke, YU Hengbin, LIU Wei. 2020. Methods of ASTER remote sensing data used in extracting mineralization and alteration information in the Hutouya mining area of the Qimantag metallogenic belt, Qinghai Province. Journal of Geomechanics, 26(3): 432-442. doi: 10.12090/j.issn.1006-6616.2020.26.03.037 |
Using ASTER remote sensing images as the data source, the extraction of mineralization and alteration anomaly in the Hutouya mining area of the Qimantag metallogenic belt in Qinghai Province is studied through two methods. One method is using the minimum noise component (MNF) transform, pixel purity index (PPI), n-Dimensional Visualization to do the end element recognition and mixture tuned matched filtering (MTMF), in order to obtain the mineral distribution map of the mining area. The other is principal component analysis, through which ferric contamination anomaly is extracted in ASTER1, 2, 3, 4 band, skarnization alteration anomaly in 1, 3, 4, 5 band, montmorillonite, illite and sericite in 3, 4, (5+6)/2 band and calcite, biomica, chlorite and other minerals in 1, 3, 4, 8 band. The results of remote sensing extraction of alteration anomaly verified by ArcGIS10.1 software are in good consistency with the mineral deposits and mineralization points determined by the field survey, indicating that the extraction results and the data processing method are reliable, which is of great guiding significance for the expansion of the prospecting scale and the discovery of mineralization enrichment areas.
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Simplified geological map of the Hutouya mining area(Liu et al, 2014)
Grayscale image of the band 1 after the MNF transformation
Grayscale image of the band 2 after the MNF transformation
Grayscale image of the band 3 after the MNF transformation
PPI image generated by pixel purity index
End element in the n-D visualizer window
Average spectral curve obtained by the n-D Mean drawing window
Extraction map of mineralization information in the Hutouya mining area
Spectra of major altered minerals in ASTER data of the study area
Total anomalies of the ASTER remote sensing image extraction in the Hutouya mining area
Typical outcrop photos of the field verification sites
Superposition diagram of total anomalies of ASTER remote sensing image extraction and field verification points in the Hutouya mining area