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<p>Mapping fluid migration pathways in hydrothermal systems is vital for identifying prospective zones for mineral exploration. In this study, we present a novel approach for detecting hydrothermal alteration zones using imaging spectroscopic data from the AVIRIS-NG mission over the well-known orogenic lode gold mineralization in the Hutti–Maski gold field of late Archean age in Southern India. The subtle shifts in the position of the absorption feature near 2310&#xa0;nm are estimated by covariance weighted least square inversion. The mineral maps are derived by matching the band shapes of diagnostic absorption features of minerals in image and library spectra. The Integrated Band Depth near 850&#xa0;nm is used to map the abundance of iron oxides. Our results suggest that the mineralized zones show a shift in the absorption feature near 2310&#xa0;nm towards shorter wavelength, the occurrence of chlorite, calcite, clay, and phyllosilicates as dominant hydrothermally altered minerals, and the enrichment of iron oxides. The presence of minerals such as chlorite, epidote and calcite is attributed to fluid-rock interaction, which results from the alteration of the amphibole group of minerals. The abundance of iron oxides in the mineralized zones possibly&#xa0;suggests weathering and leaching of Fe-rich sulphides. This study demonstrates how spectral information at very high spatial and spectral resolution can effectively identify hydrothermal alteration zones and their mineral assemblages. We also show that integrating the derived mineralogical information may provide a reliable vector for prospecting gold mineralization. Further, the results presented here have implications for locating gold mineralization zones in similar greenstone belts of the world using imaging spectroscopic data acquired from air and space-borne platforms.</p>

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Tracing Fluid Pathways Related to Hydrothermal Gold Mineralization in Hutti–Maski Schist Belt Using Imaging Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Hrishikesh Kumar,
  • T. H. Syed,
  • A. S. Rajawat,
  • Ronak Jain,
  • Aju Mohanan,
  • P. Jayaprasad,
  • S. Mukhopadhyay,
  • Rajesh Upadhyay

摘要

Mapping fluid migration pathways in hydrothermal systems is vital for identifying prospective zones for mineral exploration. In this study, we present a novel approach for detecting hydrothermal alteration zones using imaging spectroscopic data from the AVIRIS-NG mission over the well-known orogenic lode gold mineralization in the Hutti–Maski gold field of late Archean age in Southern India. The subtle shifts in the position of the absorption feature near 2310 nm are estimated by covariance weighted least square inversion. The mineral maps are derived by matching the band shapes of diagnostic absorption features of minerals in image and library spectra. The Integrated Band Depth near 850 nm is used to map the abundance of iron oxides. Our results suggest that the mineralized zones show a shift in the absorption feature near 2310 nm towards shorter wavelength, the occurrence of chlorite, calcite, clay, and phyllosilicates as dominant hydrothermally altered minerals, and the enrichment of iron oxides. The presence of minerals such as chlorite, epidote and calcite is attributed to fluid-rock interaction, which results from the alteration of the amphibole group of minerals. The abundance of iron oxides in the mineralized zones possibly suggests weathering and leaching of Fe-rich sulphides. This study demonstrates how spectral information at very high spatial and spectral resolution can effectively identify hydrothermal alteration zones and their mineral assemblages. We also show that integrating the derived mineralogical information may provide a reliable vector for prospecting gold mineralization. Further, the results presented here have implications for locating gold mineralization zones in similar greenstone belts of the world using imaging spectroscopic data acquired from air and space-borne platforms.