Abstract:On the basis of digitizing physical geological data of Xishan mining area, hyperspectral scanning of the borehole cores in the area have been carried out. By using spectral diagnostic characteristicss, altered minerals have been identifed. The hydrothermal altered minerals identified are mainly montmorillonite, illite, kaolinite, carbonate minerals, phlogopite, chlorite, muscovite opal and gypsum. Phlogopite and chlorite are closely related to rare earth mineralization. The characteristics of alteration zoning have been summarized, and spectral characteristic parameters of main alteration minerals have been extracted to realize the semiquantitative expression of main alteration minerals in the vertical direction of the borehole. According to the statistics of the characteristic peak displacement of main altered minerals, It is found that the obvious characteristic peak displacement areas of main altered minerals have good correspondence with the mineralization (ore body) section (hydrothermal alteration zone area). Among them, the peak position of Al OH, that is, the position of the characteristic peak (Pos2000) of 2200nm drifts between 2190~2220nm, and is generally larger than 2210nm. It can accurately indicate hydrothermal alteration zone area, and be used to indicate the oreforming environment, determine the prospecting direction and predict the prospecting. It is another important indicator of rare earth ore body prospecting in Xishan mining area. By using this method, ore leakage has been found in the drill holes ZK5 1 and ZK48 3. It is verified that hyperspectral analysis technology can improve the exploration quality of rare earth ore in Xishan area, and provide some references for prospecting and exploration of the same type rare earth deposit.
