Abstract:

Using FieldSpec Pro FR ground spectroscopy of American ASD Company, the authors carried out ground spectrum measurement for different geological bodies such as dacite,altered dacite,granite,granodiorite,rhyolite porphyry, schistosity belt and ore body respectively in the Hongshan Cu-Au deposit.The spectrum curves of geological bodies were achieved; and then the characteristics of absorption peak of spectrum and altered minerals were generally analyzed. According to the analysis results of microscopic identification and X-ray diffraction, this paper summarized the hyperspectral distribution characteristics of altered minerals and the mineral assemblage which are distributed in ore body, mineralized body, wall rock near ore body, altered wall rock and non-altered wall rock in the Hongshan Cu ore deposit. Based on the characteristics of mineral geology and ground wall rock alteration, the hyperspectral map of altered mineral assemblage formed and the prospecting model based on ground hyperspectral remote sensing data were constructed. The research provides hyperspectral data and typical deposit model for the further aerial survey, information extraction of altered minerals, and prediction for ore deposits.

Key words: ground spectrum measurement, altered mineral, spectrum characteristic, prospecting model based on hyperspectral remote sensing data, Hongshan Cu-Au ore deposit