The discovery of structural elements and zones of hydrothermal alterations by using ASTER satellite data in the margins of Gadabay and Murovdag ore districts (Lesser Caucasus, Azerbaijan)


Keywords: Gadabay and Murovdag, ASTER, structural elements, hydrothermal alteration, mineralization, prediction

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.

Author Biographies

Mamoy I. Mansurov
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Nazim A. Imamverdiyev
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Vagif M. Karimov
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Eyzangul F. Ganbarova
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Turgay J. Damirov
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Samir S. Mursalov
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku
Namet V. Pashayev
Azerbaijan State Oil and Industrial University, Republic of Azerbaijan, Baku

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Published
2021-10-06
How to Cite
Mansurov, M., Imamverdiyev, N., Karimov, V., Ganbarova, E., Damirov, T., Mursalov, S., & Pashayev, N. (2021). The discovery of structural elements and zones of hydrothermal alterations by using ASTER satellite data in the margins of Gadabay and Murovdag ore districts (Lesser Caucasus, Azerbaijan). Journal of Geology, Geography and Geoecology, 30(3), 512-527. https://doi.org/https://doi.org/10.15421/112147