Study of Pattern of Crustal Fracturing Using DEM Covering the Izeh Zone...

Study of Pattern of Crustal Fracturing Using DEM Covering the Izeh Zone in the Zagros Fold-Thrust Belt, SW Iran

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Mehran Azizzadeh
NIOC-Research Institute of Petroleum Industry (RIPI), Tehran, Iran,
Iran
Email: [email protected]

Sohrab Shahriari
Professor
College of Earth Science
Shahid Beheshti University
Tehran
Iran
Email: [email protected]

The Izeh zone is a part of the central Zagros,its NNE, W, SSW, and E boundaries coincide on High Zagros Fault, Balarud Fault, Mountain Front Fault, and Kazerun Fault, respectively. This study presents a structural analysis of Digital Elevation Models (10m and 100m) in order to map fracturing patterns. The analysis is based on fundamental properties of DEM such as aligned tonal variations, artificial illuminations and elevation profiles. In this manner, variation of sun azimuth and sun elevation as well as height exaggeration on DEM data and shaded relief images assist in structural Lineaments recognition. Also, DEM-based hill shading has led to the identification of the Izeh fault and its related fractures. The lineaments extracted from DEM were introduced to Arcview 3.2a to calculate the length and Azimuth of lineaments. Then detail maps of the lineaments distribution have been produced and have been analyzed in Arcview 3.2a. Some fracture systems cross through all the geological units with different ages and structural settings. These fractures are believed to be of early origin, which have been reactivated during the different stages of the Zagros orogeny. So, they had a great role on folding/ fracturing styles and patterns of the region.