Abstract
The NW part of Iran belongs to the Iranian plateau that is a tectonically active region within the Alpine-Himalayan orogenic belt. The intrusion of Oligocene parts in various faces caused the alteration and mineralization such as copper, molybdenum, gold and iron in the Siyahrood area. Granitoidic rocks with component of Granodiorite to alkali have been influenced by hydrothermal fluids. Alteration zones are important features for the exploration of deposits and the ASTER sensor is able to identify the type of alteration and its alteration zoning. This method can be a useful tool for detecting potential mineralization area in East Azarbaijan—Northwest of Iran. The purpose of this study is to evaluate ASTER data for mapping altered minerals in Siyahrood area in order to detect the potential mineralized areas. In this study, false color composite, and band ratio techniques were applied on ASTER data and argillic, phyllic, Iron oxide and propylitic alteration zones were separated. ASAR image processing has been used for lineaments and faults identified by the aid of directional filter. The structural study focused on fracture zones and their characteristics including strike, length, and relationship with alteration zones. The results of this study demonstrate the usefulness of remote sensing methods and ASTER multi-spectral data for alteration, and ASAR data are useful for lineament mapping.
Highlights
The study of mineralization related alteration zones using remote sensing is focused on the alteration minerals and the fracture patterns of the Siyahrood area in northwest Iran
Part A: the direction of lineaments in this part is N75 and altered rocks are matched with this trend of lineaments and Sharafabad-Hizejan Epithermal Gold mine has been occurred along of this lineaments and alteration zone
This study presented an investigation into integration satellite Remote Sensing and ArcGIS techniques for detecting lineaments that might be related to faults and mineralization zones
Summary
The study of mineralization related alteration zones using remote sensing is focused on the alteration minerals and the fracture patterns of the Siyahrood area in northwest Iran. The term “Lineament” is a commonly used term in geological remote sensing. There are several definitions for linear features. The classification of lineaments and its direction and length can be demarcated using satellite images. The automatic lineament extraction in this paper is performed by the directional filter of ENVI software. The area is within zone 38S of Universal Transverse Mercator coordinate system. The upper left and lower right coordinates of the study area are 4317252N, 586593E and 4262359N, 630800E, respectively. The total area covered is 1834 km
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