University of Twente Student Theses
Calcite-Dolomite mapping to assess Dolomitization patterns using laboratory spectra and hyperspectral remote sensing: A case study of Bédarieuz mining area, SE France
Nasrullah, Zaini (2009) Calcite-Dolomite mapping to assess Dolomitization patterns using laboratory spectra and hyperspectral remote sensing: A case study of Bédarieuz mining area, SE France.
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| Abstract: | Reflectance spectra in the shortwave infrared (SWIR) and thermal infrared (TIR) (1.0-15 μm) contain a number of diagnostic absorption features which can be used for identification of pure and mixture of calcite and dolomite in order to characterise calcite-dolomite ratio as a proxy for assessing dolomitization patterns. The calcitedolomite ratio were derived from laboratory reflectance spectra of synthetic samples of calcite and dolomite mixtures as a function of grain size fractions with diameter 45-500 μm, packing models from loose to compact packing sample, and mineral contents with five different weight percentage of calcite contents. The diagnostic absorption features of calcite and dolomite could be identified by the occurrences of strong vibrational absorption band positions centred at 2.34 μm and 2.5365 for pure calcite and at 2.32138 μm and 2.51485 μm for pure dolomite, while the diagnostic positions of absorption band of the calcite and dolomite in the TIR varied considerably with grain size fractions centred at 11.45–11.75 μm and 14.00–13.92 μm for pure calcite and at 11.42–11.67 μm and 13.65–13.44 μm for pure dolomite. The Positions of absorption band of the calcite and dolomite mixtures reflectance spectra in the SWIR and TIR were determined by the amount of calcite and dolomite composing the sample with calcite-dolomite ratio in the range of 2.32-2.34 μm and 2.51-2.54 μm from pure dolomite to pure calcite in the SWIR region. The ratios showed that positions of carbonate absorption band are nearly linear to the calcite content in the sample and these ratios can be used as a preliminary proxy for assessing dolomitization patterns. The diagnostic absorption features of the field samples experiment in the SWIR indicated that the majority of the field samples collected in the area between Bédarieux and Mourèze, southeastern France are dolomite and a few of rocks are calcite-dolomite mixture. A combination of laboratory spectra and hyperspectral remote sensing imagery could be used to map calcite and dolomite in order to assess dolomitization patterns in the Bédarieux mining area, southeastern France. The continuum removal spectrum of carbonate feature derived from the HyMap2003 images has been used for mapping calcite and dolomite using simple linear interpolation method. The results of calcite-dolomite mapping of the HyMap2003 images represented that the majority of abundance rocks or minerals in the study area are dominated by dolomite and the HyMap airborne hyperspectral data were fairly accurate to identify dolomite, but less accurate or sensitive to map calcite and dolomite mixtures. The dolomitization patterns in the study area were weakly identified by the HyMap images as compare to the laboratory reflectance spectra of the field samples, but the simple linear interpolation method based on spectral absorption feature parameters revealed a greatly potential to map calcite and dolomite. |
| Item Type: | Essay (Master) |
| Faculty: | ITC: Faculty of Geo-information Science and Earth Observation |
| Programme: | Geoinformation Science and Earth Observation MSc (75014) |
| Link to this item: | https://purl.utwente.nl/essays/92714 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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