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ASTER mapping of gypsum deposits of Thumrait region of southern Oman
Resource Geology ( IF 1.4 ) Pub Date : 2020-12-03 , DOI: 10.1111/rge.12245
Sankaran Rajendran 1 , Sobhi Nasir 2
Affiliation  

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 OH stretching, H2O combinations, and SO 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.

中文翻译:

阿曼南部图姆赖特地区石膏矿床的ASTER制图

这项研究证明了使用ASTER数据绘制阿曼南部图姆赖特地区的石膏矿床和相关地质构造图。光谱在石膏在使用PIMA分光计1,300-2,500纳米波长的样品的测量结果显示不同的吸收的存在下,在1400-1600,1750年,1940年,2100,和2400层纳米的特性与O H伸缩,H 2 ö组合和SØ分别弯曲弯曲和拉伸。通过研究石膏样品的独特光谱吸收特性,我们开发了一种假彩色复合材料(FCC),并使用ASTER的光谱带7、3和2通过去相关拉伸得到图像。结果FCC显示了石膏发生的区​​域,并且去相关图像将石膏发生与该区域的其他地质构造区分开。利用VNIR-SWIR谱带通过光谱角映射器方法对该区域的表面矿物学进行研究,结果表明研究区地质构造中存在硫酸盐,碳酸盐和粘土矿物。我们将ASTER的结果与使用相同方法处理的Sentinel-2A光谱带12、8和4获得的结果进行了比较。
更新日期:2020-12-28
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