ASTER mapping of gypsum deposits of Thumrait region of southern Oman

Sankaran Rajendran*, Sobhi Nasir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This study demonstrates the use of ASTER data for the mapping of gypsum deposits and associated geological formations that occurred in the Thumrait region of southern Oman. The measurement of spectra over samples of gypsum in the 1,300–2,500 nm wavelength using a PIMA spectrometer showed the presence of distinct absorptions at 1400–1600, 1750, 1940, 2,100, and 2,400 nm characteristics to O-H stretching, H2O combinations, and S-O bending overtones and stretching, respectively. Studying the unique spectral absorption characters of gypsum samples, we developed a false color composite (FCC) and an image by decorrelation stretch using the spectral bands 7, 3, and 2 of ASTER. The results FCC showed the regions of gypsum occurrences, and the decorrelated image discriminated the gypsum occurrences from other geological formations of the area. The study of surface mineralogy of the region using the VNIR-SWIR bands by the spectral angle mapper method showed the presence of sulfate, carbonate, and clay minerals of the geological formations in the study area. We compared the results of ASTER with the results obtained using spectral bands 12, 8, and 4 of Sentinel-2A processed by the same methods. The study showed that the spectral bands of ASTER can be used for mapping the gypsum and associated geological formations.

Original languageEnglish
Pages (from-to)41-62
Number of pages22
JournalResource Geology
Issue number1
Publication statusPublished - Jan 2021


  • Sentinel-2A
  • Sultanate of Oman
  • gypsum
  • image processing
  • mapping
  • spectral absorption

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology


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