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Synergistic use of ASTER, L-band ALOS PALSAR, and Hyperspectral AVIRIS-NG data for exploration of lode type gold deposit – a study in Hutti Maski Schist Belt, India
Ore Geology Reviews ( IF 3.3 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.oregeorev.2020.103818
Arindam Guha , Snehamoy Chatterjee , Thomas Oommen , K. Vinod Kumar , Sandip Kumar Roy

Abstract In this study, we have explored the utility of advanced hyperspectral, dual-polarized microwave, and advanced multispectral data to delineate potential areas of mineralization associated with the lode type gold deposit in Hutti-Maski Schist Belt Karnataka, India. We derived different image-enhanced products using visible-near-infrared (VNIR) and short-wave infrared (SWIR) spectral bands of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor to delineate major rock types of gold-bearing greenstone belt such as metabasalt, amphibolite, younger alkali feldspar rich granite, granodiorite, and tonalitic-granodioric gneiss (TTG). The principal component (PC) image composite of ASTER VNIR-SWIR bands was not only used to distinguish different granitoids but also confirmed their sharp instructive nature of contact with the greenstone rocks. We also used an index image composite using ASTER SWIR bands to discriminate granitoid, basalt and amphibolite. We could demarcate few lineaments extending through the mineralized zone (e.g., Hutti, Heera-Buddine mines, etc.) using the fused products of ASTER and two polarization channels of the Phased-array L band Synthetic Aperture Radar (PALSAR) sensor of the Advanced Land Observation Satellite (ALOS). All these image-enhanced products are validated using the reference geological map of the study area and field data collected along selected field -traverses. The mineralogical and petrographical data of the altered rocks from the study site revealed the formation of calcite, scapolite, and other minerals. Represenattive reflectance spectrum of the altered rock was used to spatially delineate the surface distribution of the patchy and small alteration zones using airborne hyperspectral data of the Advanced Visible Infrared Imaging Spectrometer Next Generation (AVIRIS-NG) sensor. In this regard, a unified spectral map of altered rocks was derived by integrating two alteration maps prepared independently using two different partial sub-pixel algorithms (constrained energy minimization and matched filtering). Occurrences of altered rocks in the vicinity to favorable geological lineaments and their spatial proximity to metavolcanic-younger felsic intrusive contacts suggest their importance as the potential sites for detailed exploration.

中文翻译:

协同使用 ASTER、L 波段 ALOS PALSAR 和高光谱 AVIRIS-NG 数据勘探矿脉型金矿——印度 Hutti Maski 片岩带的一项研究

摘要 在这项研究中,我们探索了先进的高光谱、双极化微波和先进的多光谱数据的效用,以描绘与印度卡纳塔克邦 Hutti-Maski 片岩带矿脉型金矿床相关的潜在矿化区域。我们使用先进星载热发射和反射辐射计 (ASTER) 传感器的可见-近红外 (VNIR) 和短波红外 (SWIR) 光谱带衍生出不同的图像增强产品,以描绘含金绿岩带的主要岩石类型如变玄武岩、角闪岩、较年轻的富含碱长石的花岗岩、花岗闪长岩和方质-花岗闪长片麻岩 (TTG)。ASTER VNIR-SWIR 波段的主成分 (PC) 图像合成不仅用于区分不同的花岗岩,而且还证实了它们与绿岩接触的尖锐指导性质。我们还使用了使用 ASTER SWIR 波段的索引图像合成来区分花岗岩、玄武岩和角闪岩。我们可以使用 ASTER 的融合产物和 Advanced 的相控阵 L 波段合成孔径雷达 (PALSAR) 传感器的两个极化通道来划定延伸穿过矿化带(例如 Hutti、Heera-Buddine 矿等)的少数线路陆地观测卫星 (ALOS)。所有这些图像增强产品都使用研究区域的参考地质图和沿选定的田间导线收集的田间数据进行验证。研究地点的蚀变岩石的矿物学和岩石学数据揭示了方解石、方柱石和其他矿物的形成。使用新一代高级可见红外成像光谱仪 (AVIRIS-NG) 传感器的机载高光谱数据,使用蚀变岩石的代表性反射光谱在空间上描绘斑块状和小蚀变带的表面分布。在这方面,通过整合使用两种不同的部分子像素算法(约束能量最小化和匹配过滤)独立制备的两张蚀变图,得到了统一的蚀变岩谱图。
更新日期:2021-01-01
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