Abstract

 
 
 The article considers the discovery of structural elements, zones of hydrothermal alterations and mineralization in the margins of Gadabay and Murovdag regions and the study of prospective areas for mineralization characterized by them by using ASTER satellite data. The main purpose of the research is the definition of the lithological composition of rocks, ring and linear structures and zones of hydrothermal alterations with the help of remote-sensing methods and by better technological development of special radiometric data. In order to detect the lithological composition of associated rocks of alteration zone of endogenous ores, 14 channel data of ASTER has been used. By using stereoscopic images obtained from ASTER data, it was determined that hydrothermal alterations are mainly represented by alunitization, kaolinization, sericitization, silication, pyropilitization and silification in the studied ore regions. These changes were shown to be characteristic for copper-porphyry, gold- copper pyrite, copper-polymetal and gold-copper-porphyry deposits. Strip ratios, principal component analysis (PCA), minimum of noise fraction (MNF) and selection method for least squares (LS) have been used to map hydrothermal alteration zones. The ring structures detected in the area, different fault fractures and lineaments are assessed as favourable geological structural factors for alteration and mineralization. The results obtained by ASTER image analysis confirm the presence of derivative minerals which are considered to be the product of hydrothermal alterations which are densely concentrated (kalium spathization, kaolinization, serictization, pyrophyllitization, alunitization) has been confirmed. The points each with private coordinates have been determined (defined) within separate areas with the help of remote data and relevant anomalous maps prepared. These points are considered favourable geological condition in terms of the type and intensity of hydrothermal alterations in the area. Such areas are considered a sign of indirect search significant for the detection of copper-polymetallic, copper-porphyry, copper-pyrite and gold-pyrite type of mineralization with epithermal origin in the region.
 
 
Highlights
According to the data on VNIR/short-wave infrared (SWIR) surfaceCosmic, multi-spectral systems such as Landsat MSS, TM and SPOT possess spectral channels ranging from 4 to 7
Based on the conducted research work, the conformity between the results obtained by ASTER image analysis and the conclusions drawn as a result of field work were confirmed
Using stereoscopic images obtained from ASTER satellite data, existing or supposed tectonic structures in the region have been detected
Summary
According to the data on VNIR/SWIR surfaceCosmic, multi-spectral systems such as Landsat MSS, TM and SPOT possess spectral channels ranging from 4 to 7. Landsat MSS data is mainly applied during the structural and geomorphological interpretation on a regional scale (Goetz et al, 1983; Abrams et al, 1983; Perry, 2004). Using ASTER (Advanced Spaceborne Thermal Emission and Reflection) data, the wide application of the potential opened up by the discovery of ore deposits within ore regions and areas and application of satellite spectrometers in the spatial definition of mineral indicators in various geological conditions have been observed in recent times (Abrams et al.,2000; Sabins 1999; Spatz et al, 1994; Watson et al, 1990; Tommaso et al, 2007). ASTER covers visible, near infrared (VNIR), short-wave infrared (SWIR) and thermal infrared (TIR) spectral areas reflection features, alteration processes of minerals, such as alunitization, kaolinization, sericitization, silicification and propylitization have been recorded. The detectability of hydrothermal alterations and mineralization zones based on remote-s ensing data create wide opportunities for conducting effective geological researches in this area
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