Structural Deformation Analysis of Northern Limb of Central Alborz

Articles in Press

Document Type : Original Article

Authors

1 Geology Department-College of Sciences- Golestan University-Gorgan-Iran

2 Geology Department, - College of Sciences-Golestan University-, Gorgan-Iran

3 Geological Department, College of Sciences, Golestan University

10.22077/jt.2024.7940.1183

Abstract

In this research, the Baladeh area, located in Northern limb of Central Alborz, is selected for present a Tectonic model via investigation on structural deformations. The structures were extracted with using of Remote sensing techniques, GIS and field surveys, and then the geometrical and kinematic analysis were performed on them. This research shown that main structures are Khazar; Mangel; Nowrud; and Aliabad reverse (thrust) faults, Emarat anticline and Nagolesar uplanded syncline. These structures have East-West strikes similar to Central Alborz trend. The investigation on faults present that the main deformation controlled by reverse (thrust) faults. The structures (expect Aliabad fault) with east-west strikes have low angle (40-50º) dip toward South and caused to Northward thrusting of rock sequences. The investigation on kinematic relationship of structures shown that the Emarat anticline has a genetically relationship with Mangel fault and also, the companionship of Nowrud and Aliabad reverse (thrust) faults caused to form a Flower structure (as a Push up block) such as Nagolesar uplanded syncline. The existence of two P axes with N336 and N160 azimuth in southern area present a complex compressional system which usually shown in interval of two thrust faults with opposite dips (such as Nowrud and Aliabad faults). The surveying of kinematic axes present that Sinistral rotation of them from N50 in Northern part) to N15 (N336) in Southern part which related to South-Southwest ward of South Khazar plate which impressed on Northern limb of Alborz. This phenomenon caused to establishment of Transpressional (Compressional- shearing) tectonic regime.

Keywords

Journal of Tectonics

Articles in Press, Accepted Manuscript
Available Online from 13 November 2024

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