Remote Sensing
R. Ahmadi Rohany; M. H. Karimpour; B. Rahimi; A. Malakzadeh Shafaroudi; S. Najafi Afshar
Abstract
The studied area is located at the east of Bajestan city and south west of Khorasan Razavi province. This region is at the north of the Lut Block, the largest structural block in east of Iran. Structure of this area is affected by activity of deep strike-slip faults in the boundary of the blocks. Lineaments ...
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The studied area is located at the east of Bajestan city and south west of Khorasan Razavi province. This region is at the north of the Lut Block, the largest structural block in east of Iran. Structure of this area is affected by activity of deep strike-slip faults in the boundary of the blocks. Lineaments are mapped by the means of SPOT-5 and Landsat satellite data and DEM data. Structural studies were carried out in two stages: at first, main faults were indicated, mapped and analyzed and then for more detail research, total lineaments (faults and joints) were mapped and analyzed. Verification studies were conducted with field surveys. Remote sensing studies indicate importance of applying enhancement filters like standard kernels on stereoscopic data like SPOT as an efficient tool for structural studies, especially for lineament extracting. Fractal studies and using fractures statistical parameters (based on fracture map obtained by remote sensing data (in the area in addition to determining fractal dimension, were used as complementary methods for recognition structural evolution and specifying the most probability of mineralization occurrence. Fractal, structural- statistical analyzes, field and remote sensing studies on fracture systems in the area indicate that structural elements in the studied area, most probably are related to the main strike-slip faults activities and can be considered as Riedel shear fractures in its wall of damage zone. Also the results indicate that most of the lineaments in this area are extensional fractures corresponding to both dykes emplacement and alteration zones associated with mineralization. Combining the mentioned information can play important role in identifying structural evolution processes and specifying areas with more mineralization potential.
R Ahmadi Rohany; M.H Karimpour; B Rahimi; A Malakzadeh Shafaroudi
Abstract
The studied area is located in east of BajestanTownship, KhorasanRazaviProvince and this region is a part of the Lut Block. Granite is the most important rock in this area with covering approximately 70km2. Processing of satellite data in this area was done by using of SPOT, ASTER and Landsat ETM+ data. ...
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The studied area is located in east of BajestanTownship, KhorasanRazaviProvince and this region is a part of the Lut Block. Granite is the most important rock in this area with covering approximately 70km2. Processing of satellite data in this area was done by using of SPOT, ASTER and Landsat ETM+ data. SPOT images processing and using PCA methods (standard and selective) on the ETM+ data show this intrusive body doesn't have an equal chemical composition. The central part of the intrusive body has distinctive from margin and it seems that the central part have more mafic mineral. For enhancing linear structure, high pass, directional, threshold and sobel filters were applied separately and compositional on the SPOT data. By using these filters linear structures became completely obvious and were vectorized digitally. The most of them show northwestern-southeastern trend. ASTER data processing by spectral angle mapper (SAM), band ratio and band composition methods enhanced epidote, sericite, hematite, argilic and silicified alterations. Processing and Interpretation of airborne geophysical data (potassium, thorium, uranium and total magnetic intensity), which collected by airplane show the amounts of these triple elements (K,U,Th) are high and in vice versa Total Magnetic Intensity data (TMI) is low in this granite. Separating geological boundaries and enhancing major faults are other results from processing of geophysics data. Merging all of the data consist of: satellite and geophysics data processing and field research indicate alteration zones have relation to linear structures in this area. This research specifies the most probability of mineralization presence in this area so that Fe and Cu mineralization conform to epidotic-chloritic and argilic alterations. Introducing favorable area can help us to concentrate exploration activities and next researches in this area and prevent wasting money and time.
