TY - JOUR
T1 - ASTER mapping of gypsum deposits of Thumrait region of southern Oman
AU - Rajendran, Sankaran
AU - Nasir, Sobhi
N1 - Funding Information:
The authors are thankful to the NASA Land Processes Distributed Active Archive Center User Services, USGS Earth Resources Observation and Science (EROS) Center (https://LPDAAC.usgs.gov) for providing the ASTER data. This study is supported by the SQU Internal grant no IG/DVC/ESRC/17/01. The authors are thankful to the editor of the journal and the anonymous reviewers of the paper for their valuable reviews and providing useful comments and suggestions that have helped to present the work lucidly. The Open Access funding is provided by the Qatar National Library, Qatar.
Funding Information:
The authors are thankful to the NASA Land Processes Distributed Active Archive Center User Services, USGS Earth Resources Observation and Science (EROS) Center ( https://LPDAAC.usgs.gov ) for providing the ASTER data. This study is supported by the SQU Internal grant no IG/DVC/ESRC/17/01. The authors are thankful to the editor of the journal and the anonymous reviewers of the paper for their valuable reviews and providing useful comments and suggestions that have helped to present the work lucidly. The Open Access funding is provided by the Qatar National Library, Qatar.
Publisher Copyright:
© 2020 The Authors. Resource Geology published by John Wiley & Sons Australia, Ltd on behalf of Society of Resource Geology.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1
Y1 - 2021/1
N2 - 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.
AB - 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.
KW - Sentinel-2A
KW - Sultanate of Oman
KW - gypsum
KW - image processing
KW - mapping
KW - spectral absorption
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U2 - 10.1111/rge.12245
DO - 10.1111/rge.12245
M3 - Article
AN - SCOPUS:85097030242
SN - 1344-1698
VL - 71
SP - 41
EP - 62
JO - Resource Geology
JF - Resource Geology
IS - 1
ER -