Analysis of the effects of detachment levels, thrust and basement strike-slip faults on the geometry of the Naft anticline structure in the Lurestan sub-zone, West Iran

Alipoor, Reza; Mehrali Mansouri, Mahsa; ghasemi, zahra

Volume 8, Issue 1 (Spring & Summer 2022) KJES 2022, 8(1): 75-96 | Back to browse issues page

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Alipoor R, Mehrali Mansouri M, ghasemi Z. Analysis of the effects of detachment levels, thrust and basement strike-slip faults on the geometry of the Naft anticline structure in the Lurestan sub-zone, West Iran. KJES 2022; 8 (1) :75-96
URL: http://gnf.khu.ac.ir/article-1-2787-en.html

Analysis of the effects of detachment levels, thrust and basement strike-slip faults on the geometry of the Naft anticline structure in the Lurestan sub-zone, West Iran

Reza Alipoor ^*

¹, Mahsa Mehrali Mansouri²

, Zahra Ghasemi²

1- u-Ali Sina University , rezaalipoor116@gmail.com
2- u-Ali Sina University

Abstract: (615 Views)

The Naft anticline is located in the NW-SE of the N Lurestan sub-zone and the Zagros fold and thrust belt. In this sub-zone, the structural geometry of the folded sequence is significantly influenced by the basemen thrust and strike-slip faults and detachment levels. In this research, for the geometrical analysis of the Naft anticline, we utilized the structural profile perpendicular to the anticline in the central region, information from drilling wells in the study area and neighboring anticlines, and the deformation pattern and structural geometry of the Naft anticline. The anticline has two upper (Amiran Formation) and Middle (Garau Formation) detachment levels. The basement thrust faults and detachment levels in the southwestern limb had a significant impact on the folding geometry and led to the formation of disharmonic folding. An N-S basement strike-slip fault in the middle part of the anticline has shifted the anticline axis from N70W in the northwest to N50W in the southeast. In addition, the minor and shallow thrust faults propagationg from the upper detachment levels or the independent thrusts in the Gurpi Formation resulted in the development ofan axis of two kink and curved hinges in the middle part of the Naft anticline in folded structures. The analysis of the geometrical parameters of the Naft anticline shows that it is an asymmetrical and noncylindrical fold, categorized as an open half-angle fold in terms of tightness.

Keywords: Zagros, Cross-section, Thrust, Folding, Basement fault

Full-Text [PDF 2313 kb] (210 Downloads)

Type of Study: Original Research | Subject: Tectonics
Received: 2021/07/20 | Accepted: 2022/07/15 | Published: 2022/09/13