ASTER has thermal infrared bands and provides a potential to lithological mapping on the earth.The ASU thermal spectral library consists of thermal infrared emission spectra of pure minerals

with an emphasis on common rock-forming minerals.Each mineral spectrum is accompanied by physical and compositional information.The minerals spectra are resampled to ASTER thermal bands

and the band ratios are analyzed with the oxide components correlation coefficients.To select the maximum correlation coefficient

and create the simulation formula on the emissity spectra ratios and the component

then the relationship between the spectra and the component is established.The SiO2

MgO

Al2O3

CaO

K2O

Na2O components formula are established differently.The statistics was done by the minerals and it can be applied to the rocks and the ASTER imageries.To use the simulation formula in the Xifanpin copper deposit area

and use the SiO2

Na2O

K2O contents to lithology mapping

most areas were validated.By using SiO2 contents to classify the silica zone

sandstone-type copper mineralization was found in the anomaly zone.