Geometric and kinematic analysis of Dorbadam anticline, North of Quchan, Iran

Iranian Journal of Earth Sciences

مقاله 4، دوره 10، شماره 2، دی 2018، صفحه 121-134   

نوع مقاله: Original Research Paper

نویسندگان

Hamidreza Afkhami Ardakani¹؛ Farzin Ghaemi^{* 2}؛ Behnam Rahimi²

¹Master of Tectonics, Department of Geology, Ferdowsi University, Iran.

²Department of Geology, Ferdowsi University, Iran.

چکیده

The geometric and kinematic analyzing of the anticlines and their relation with the large-scale structures are used to determine the structural evolution of the area. The Dorbadam anticline is located in the Kopet-Dagh structural zone, 45 km due north of Quchan and on the Razavi and North Khorasan provinces border. The field study and geometric analysis indicate that the Dorbadam anticline has two culminations with an en-echelon arrangement and different structural evolution. The NW culmination (DA.1) is analyzed as a fault propagation fold geometry, while the SE culmination is known as a simple folding. The axial trend of the Dorbadam anticline has been changed and shows harmonic and Horizontal inclined, 1C subclass of Ramsay's classification, close, asymmetrical over fold in DA.1 part; upright and horizontal, open and symmetrical upright fold in DA.2 part. Aspect ratio on the Dorbadam anticline is 0.64 and has a parabolic appearance. The joint study revealed the existence of five major joints in this area which are bedding and strike joints (tension and compression joints parallel to the axial fold) or dipping joints (tension joints). The systematic joints analyzing of Tirgan Formation with T-Tecto software determined that the trend of maximum stress in the Cretaceous was S07W. The paleo-stress direction determined S25W with axial plane analysis. The Analysis of large-scale faults indicated a change in the stress direction during the time and specified they are post-tectonic and the activity of faults occurred in some various stress systems.

کلیدواژه‌ها

Dorbadam anticline؛ Kopet-Dag؛ Tirgan Formation

مراجع

1. Afkhami Ardakani, H (2017) Structural analysis of Dorbadam anticlinal, Msc Tesis, Ferdowsi university of Mashhad (in Persian).
2. Afshar Harb A, Bolourchi M, Mehr Parto M (1987)  Geological quadrangle map of Iran no. J5 (Bojnurd sheet), scale 1: 250,000, Geological Survey of Iran.
3. Afshar Harb A (1994). Kopet Dagh Geology, Iran geological books, Geological Survey of Iran, V. 11 (in Persian).
4. Berberian M, King G (1981) Towards a Paleogeography and Tectonic Evolution of Iran. Canadian Journal of Earth Sciences 18: 210-265.
5. Donath FA, Parker RB (1964) Folds and Folding. Geological Society of America Bulletin 75: 45-62.
6. Fleuty MJ (1964) the description of folds, Proceedings of the Geologists Association of London 75: 461-492.
7. Hollingsworth J, Jackson J, Walker R, Gheitanchi MR, Bolourchi MJ (2006) Strike-slip faulting, rotation, and along-strike elongation in the Kopeh Dagh mountains, NE Iran, Geophysical Journal Internationa, 166: 1161-1177.
8. Hollingsworth J, Jackson J, Walker R, Nazari H,(2008) Extrusion tectonics and subduction in the eastern South Caspian region since 10 Ma, Geology 36 (10): 763-766.
9. Javidfakhr B, Bellier O, Shabanian E, Ahmadian S, Saidi A (2011) Plio–Quaternary tectonic regime changes in the transition zone between Alborz and Kopeh Dagh mountain ranges (NE Iran), Tectonophysics 506: 86–108.
10. Lyberis N, Manby G, Poli JT, Kalougin V, Yousouphocaev H, Tasmet Ashirov T (1998) Post-triassic evolution of the southern margin of the Turan plateÉvolution post-triasique de la partie sud du bloc de Turan, Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 326 (2): 137-143.
11.  
12. McClay KR (2003) Advanced Structural Geology for Petroleum Exploration, Lecture notes, Volume 1.
13. Navabpour P, Heidarzadeh Gh, Mafi A, Haghpour N, (2003) The Pattern of Dformation and Structural Zoning of Kopet Dagh Province, The Twenty-Second Earth Sciences Congress (in Persian).
14. Ramsay JG (1967) Folding and Fracturing of Rocks, McGraw-Hill, New York.
15. Ramsay JG (1982) Rock ductility and its influence on the development of tectonic structures in mountain belts: in K.J. Hsu, editor, Mountain Building Processes, London: 111–127.
16. Ramsay JG, Huber MI (1987) The Techniques of Modern Structural Geology, Academic Press.
17. Shabanian E, Bellier O, Abbassi MR, Lionel Siame L, Farbod Y (2010) Plio-Quaternary stress states in NE Iran: Kopeh Dagh and Allah Dagh-Binalud mountain ranges, Tectonophysics 480: 280–304.
18. Sheikholeslami MR, Hagipour N, Navabpour P, Navab Motlagh A, Kouhpeima M, Mafi A, Heidarzadeh Gh, (2013) Geological and tectonic Studies in Kopet-Dagh and Binalood region: Research Project, Geological Survey & Mineral Exploration of Iran, Geosciences Research Institute (in Persian).
19. Suppe J, Medwedeff DA (1990) Geometry and kinematics of fault-propagation folding. Eclogae Geologicae Helveticae 83: 409-454.
20. Suppe J (1983) Geometry and kinematics of faultbend folding. American Journal of Science, 283, 684-721.
21. Suppe J (1985) Principles of Structural Geology. Englewood Cliffs, New Jersey, Prentice hall.
22. Zanchetta S, Berra F, Zanchi A, Bergomi M, Caridroit M, Nicora A, Heidarzadeh G (2013) The record of the Late Palaeozoic active margin of the Palaeotethys in NE Iran: Constraints on the Cimmerian orogeny, Gondwana Research 24 (3–4): 1237-1266