Neotectonics of the Avaj region (NW Iran): left-lateral strike-slip and range-parallel reverse faults Neotectonics of the Avaj region (NW Iran): left-lateral strike-slip and range-parallel reverse faults

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Vol17 No.4: 838-850

Title】Neotectonics of the Avaj region (NW Iran): left-lateral strike-slip and range-parallel reverse faults

Author】Reza ALIPOOR*; Amir Hossein SADR; Sahar GHAMARIAN

Addresses】Geology Department, Faculty of Basic Science, Bu-Ali Sina University, Hamedan 009881, Iran

Corresponding author】Reza ALIPOOR

Citation】Alipoor R, Sadr AH, Ghamarian S (2020) Neotectonics of the Avaj region (NW Iran): left-lateral strike-slip and range-parallel reverse faults. Journal of Mountain Science 17(4). https://doi.org/10.1007/s11629-019-5688-0

DOI】https://doi.org/10.1007/s11629-019-5688-0

Abstract】The aim of this study is the geomorphological analysis of neotectonic deformation in the Avaj region in the NW part of the Iranian Plateau. We use observations from detailed field surveys and the analysis of digital elevation model (DEM) and satellite images (Landsat-7 ETM+, 30-m resolution) to explore a new E-W trending strike-slip fault system in the study area.The major active faults of the Avaj region are the NW-SE trending Avaj and Hassanabad fault zones. The Avaj Fault is a SW-dipping reverse fault with a transport toward NE and the Hassanabad Fault is a NE-dipping reverse fault that has moved Paleozoic rocks over Cenozoic sedimentary units. Moreover, there aresome E-W trending left-lateral strike-slip faults which cut Late Quaternary deposits. The relationship between the NW-SE and E-W faults indicates that the slip at the termination of the NW-SE faults changes from reverse to left-lateral strike-slip faults. The activity of the left-lateral faults has formed a series of offsets and displacements in drainage paths. These left-lateral faults probably initiated in 5±2 Ma because of the convergence between the Central Iran and the South Caspian blocks.

Keywords】Active tectonic; Offset; Earthquake; Geomorphology; Avaj Fault; South Caspian