جغرافیا و توسعه (Dec 2017)
Neotectonics Analysis in the Basin of the North West Slopes of Sahand (East Azerbaijan)
Abstract
The evaluation of active tectonics in each region is important. Several faults in the Sahand mountain range provide a suitable basis for studying tectonic activities in the basins of this region. Eskochai and Azarshahrchay basins are located on the northwest of Sahand Mountain. The geomorphologic evidence of the basins under discussion suggests the continuation of neo tectonic activities during the Plough Quaternary period. The purpose of this study was to evaluate the relative activity of the tectonics of the area using formometric analysis and comparing the results obtained from geomorphic indicators and geomorphologic evidence. In this research, various geomorphologic indices (AF, BS, T, SL, S, VF), topographic maps and geology maps, Arc GIS software, Arc maps, global mapper have been used for analyzing Neotectonic activities of the region. The results of the study indicate that the values obtained from geomorphic indices and the study of geomorphologic evidence suggest the neotectonic activity with different degrees in the whole range of study, so that tectonic activity in both studied basins is high. And basins are classified according to the classification of the IAT index in class 2. Numerical quantities obtained from geomorphic indices by geomorphologic evidence such as extreme changes in longitudinal river profiles, vertical wall over the river, main river asymmetry, drainage network asymmetry, length of the waterway on the river side, change in depth and width of the river bed Deep valleys are confirmed. The results of the observed indices and geomorphologic evidence indicate that the river system of the river basin is more influential than the young neo tectonic movements. According to these analyzes, the results indicate that the neo tectonic activity in the region continues, and in total, both basins were detected in terms of active tectonic activity.
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