Evaluating spectral results of spectroradiometer in outdoor and laboratory for identification of alteration minerals, case study; Kerman porphyry copper deposits


Department of Ecology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran


Numerous spectrometer and spectroradiometer models such as TerraSpec and FieldSpec have been designed to measure wavelengths over the Visible Near Infrared (VNIR) and Short Wave Infrared (SWIR) regions. In this research the spectral measurements were conducted indoors and outdoors at the Institute of Science and High Technology and Environmental Sciences of Kerman Gradate University using FieldSpec3 spectroradiometer to identify alteration minerals. The spectral results were compared to the extracted spectra of TerraSpec® spectrometer from Basque university, Spain, microscopic studies and X-ray diffraction (XRD) results. The attempt is to investigate the accuracy of the extracted spectra, optimize the noise and offer a suitable suggestion for improvement the results through implantation of processing methods. Spectral measurements in different situations revealed that many factors such as; the environmental conditions, the distance of electronic gun from samples, time of measurement, and field of view angle can effect on the spectral response. With implementation of this research an appropriate laboratory space were supplied for spectral measurement by FieldSpec3 spectroradiometer. In addition, the spectral analysis identified muscovite, illite, halloysite, montmorillonite, dickite, kaolinite, chlorite, epidote, calcite, pyrophyllite, biotite, jarosite, goethite, and hematite.


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