Impact of active tectonic on geomorphologic evidence of alluvial fans (case study: Bardeskan-kashmar)

Document Type : Case Study

Authors

• fateme najafi ¹
• Seyed Reza Hosseinzadeh ²
• shahram bahrami ³

¹ teacher

² Geography of Ferdowsi University of Mashhad

³ SHAHID BEHESHTI UNIVERSITY

10.22067/geoeh.2022.78382.1274

Abstract

In this research, the effect of active tectonics on the morphology of alluvial cones located between the city of Kashmar and the village of Ali Abad Kashmar in Bardeskan city has been studied. The descriptive-analytical method is based on 1:25000 topographic maps, 1:100000 and 1:250000 geological maps, and Landsat satellite image data. The results of the research showed that under the influence of fault activity, alluvial cones form the dominant geomorphic landscape of this region. The activity of the reverse slip fault by passing through the top of most of the alluvial cones has caused the change of the main channel of the alluvial cones to their marginal and lateral parts, the change of the sedimentation position, as a result, has caused the intersection of some alluvial cones in three transverse levels and two longitudinal and transverse levels. IsThe activity of the internal fault is evident by passing through the upper, lower and base of alluvial cones in the form of uplifts, pressure ridges, and pressure vaults. Other effects of this fault include the left-round displacement of some sub-channels on the surface of the alluvial cone and the formation of one-level, two-level transverse and longitudinal alluvial cones by the sub-channels at the base of the alluvial cone and at the foot of the pressure domes, as well as changing the intersection point of the main channels of the cone. Alluviums and the formation of alluvial cones intersected in two levels, longitudinally and transversely, in the downstream of the inner fault

Keywords

• Active tectonics
• active fault
• alluvial fans
• Doruneh
• morphology

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