Publication Type:Journal Article
Source:Geological Society of America Bulletin, Geological Society of America (GSA), Boulder, CO, United States, Volume 116, Number 11-12, p.1318-1326 (2004)
Keywords:accuracy, algorithms, Canada, classification, cores, data processing, diorites, disseminated deposits, eastern canada, experimental studies, foliation, FTIR spectra, gabbros, granites, host rocks, identification, igneous rocks, infrared spectra, laboratory studies, mapping, metal ores, mineral composition, Mining, mining geology, norite, Ontario, ore grade, plutonic rocks, quartz diorites, reflectance, rock mechanics, silicate rocks, simulation, spectra, spectroscopy, Sudbury Basin, sulfides, techniques, underground mining, water
This study investigates the usefulness of thermal infrared reflectance spectroscopy (TIR) to map rock faces in an underground environment. A laboratory Fourier transform infrared (FTIR) spectrometer was used to measure reflectance spectra (500-5000 cm (super -1) ) of freshly broken rock surfaces. A total of 37 samples covering 10 different rock types, including barren silicate rocks and rocks with disseminated sulfides, was collected from eight mines around the Sudbury Basin in Ontario. Freshly broken rock surfaces were measured wet and dry to address environmental conditions encountered under-ground. Spectral data were processed by the second-derivative approach and the spectral angle mapper algorithm (SAM) for rock-type identification. An average of 77% accuracy was achieved for all rock types. The success of this effort implies that hyperspectral analysis using second-derivative spectra is effective to remove the effect of liquid water, local geometry, and disseminated sulfides while preserving diagnostic rock spectral signatures between 700 and 1300 cm (super -1) .
GeoRef, Copyright 2018, American Geological Institute.<br/>2004-085833<br/>hyperspectral data<br/>thermal infrared reflectance spectroscopy<br/>TIR spectra