ASTER mapping of gypsum deposits of Thumrait region of southern Oman

IF 1.1 4区地球科学 Q3 GEOLOGY

Resource Geology Pub Date : 2020-12-03 DOI:10.1111/rge.12245

S. Rajendran, S. Nasir

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引用次数: 4

Abstract

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.

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阿曼南部Thumrait地区石膏矿床ASTER制图

这项研究展示了ASTER数据用于绘制阿曼南部Thumrait地区的石膏矿床和相关地质构造。用PIMA光谱仪测量石膏样品在1300 ~ 2500 nm波长上的光谱，发现在1400 ~ 1600、1750、1940、2100和2400 nm处分别存在明显的O - H拉伸、H2O组合和S - O弯曲泛音和拉伸特征。研究石膏样品独特的光谱吸收特性，利用ASTER光谱的7、3、2波段进行去相关拉伸，制备了假彩色复合材料(FCC)和图像。结果FCC显示了石膏产状区域，去相关图像将石膏产状与该区域其他地质构造区分开。利用VNIR - SWIR光谱角成像仪对该地区的地表矿物学进行了研究，发现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的结果与采用相同方法处理Sentinel - 2A的12、8和4波段得到的结果进行了比较。研究表明，ASTER的光谱波段可以用于石膏及其相关地质构造的定位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resource Geology 地学-地质学

CiteScore

2.30

自引率

14.30%

发文量

审稿时长

12 months

期刊介绍： Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.