Paleostress and kinematic analyses by using fault slickenline of the Qaemyeh, south western Iran

Document Type : Original Article

Authors

1 . Professor, Department of Earth Sciences, School of Sciences, Shiraz University, Shiraz, Iran

2 Master Science, Department of Earth Sciences, School of Sciences, Shiraz University, Shiraz, Iran

3 PhD student, Department of Geology, School Sciences, Birjand University, Birjand, Iran

Abstract

Abstract
The Qaemyeh area is located in 100 km west of the Shiraz city and 40 km north of Kazerun city. The Qaemyeh fault was formed by segmentation of the Kamarij fault as part of the active Kazerun strike-slip fault. This fault is part of the Zagros Foreland Folded Belt. The study area includes the normal component of dextral strike-slip fault cut the Gurpi, Pabdeh and Sarvak formations, and the other right- lateral strike- slip fault cut Asmari formation. The fault is low angle Riedel shear fractures that follow the pattern of the Kazerun fault. Analysis of the slicken lines of the fault plane were preformed in order to reconstruct the orientations effective stress by using fault-slip graphical inversion method. The  calculated plunges and trends of the principal stresses  of the normal fault are σ1 76º, S71°W,σ2 06º, S60°E and σ3 is70º, N31°E, 70º and  for the strike- slip fault, σ1 are  NE, N31°E, 07º ,σ2 is SE, S84°W, 70º, and σ3 S60°E, 06º respectively. Based on the study of fault-slip data and slickenside lineation, using the multiple inverse methods, two phases of stress are recognized. An early tension stress field caused faulting in the area, while the later stress phase is resulted by occurrence of young fracture system in the area. The tectonic regime of prevailing in the region by ratio R= (σ2-σ3)/(σ1-σ3) is extension. The stress field around faults is related of the Kazerun fault activities. 

Keywords

Full Text

 

 

 

References

Agard, P., Omradi, J., Jolivet, L., Whitechurch, H., Vrielynck, B., Spakman, W., Monie, P., Meyer, B and Wortel, R., 2011. Zagros orogeny: a subduction-dominated process. Geology Magazine,10, 1-34.
Allmendinger , R., 2011. Program FaultKin 5.0.
 
Angelier, J. and Mechler, P., 1977. Sur une méthode graphique derecherche des contraintesprincipales égalment utilisable en tectonique et en seismologie: La méthode desdièdres droits. Bulletin Société Géologique de France, 19, 1309–1318.
Angelier, J., 1989. From orientation to magnitudes in paleostress determinations using fault slip data. Journal of Structural Geology, 11, 37–50.
Angelier, J., 1984. Tectonic analysis of fault slip data sets. Journal of Geophysical Research, 89, 5835–5848.
Angelier, J., 1994. Inversion of brittle tectonic data in order to determine Stress & Tensor: Faults, non faults and pressure – tension structures. Geology France,18, 211-219.
Armijo, R., Carey, E. and Cisternas, A., 1982. The inverse problem in microtectonics and the separation of tectonic phases. Tectonophysics, 82, 145–160.
Authemayou, C., Chardon, D., Bellier, O., Malekzade, Z. and Shabanian, Z., 2006. Late Cenozoic partitioning of oblique plate convergence in the Zagros fold-and-thrust belt (Iran). Tectonics, 25, 48-59.
Arthaud, F., 1969. Méthode de détermination graphique des directions de raccourcissement, d'allongement et intermédiaire d'une population de failles. Bulletin de la Société Géologique de France, 11, 5, 729–737.
Berberain, M., 1995. Master blind thrust fault hidden under the Zagros folds: Active basement tectonics and surface morphotectonics. Tectonophysics, 241, 143-224.
Carey, E. and Brunier, B., 1974. Analyse the´oretique et nume´rique d’un mode`le me´canique e´le´mentaire applique´ a I’e´tude d’une population de failles. Comptes Rendus de l’Acade´mie des Sciences, Paris D279, 891-894.
Etchecopar, A., Vasseur, G. and Daigniers, M., 1981. An inverse problem in microtectonics for the determination of stress tensors from fault striation analysis. Journal of Structural Geology, 3, 51–65.
Falcon, N., 1974. Southern Iran: Zagros Mountains. In Mesozoic-Cenozoic Orogenic Belts: Data for orogenic studies (Ed. A. M. Spencer). Geological Society of London, Special Publication, 4, 199–211.
Falcon, N.L., 1967. The geology of the northeast margin of the Arabian basement shield. Advance Sciences, 15, 31-42.
Federico, L. and Crispini, G., 2010. Fault-slip analysis and transpressional tectonics: A study of Paleozoic structures in northern Victoria Land, Antarctica. Journal of Structural Geology, 32, 667-684.
Fossen , H., 2010. Structural Geology. Cambridge University Press, New York, 463.
Leturmy, P., Molinaro, M. and Frizon de lamotte, D., 2010. Structure timing and morphological signature of hidden reverse basement faults in the Fars Arc of the Zagros (Iran). In Tectonic and Stratigraphic Evolution of Zagros and Makran during the Mesozoic– Cenozoic (Eds P. Leturmy and C. Robin). Geological Society of London, Special Publication, 330, 121–38.
Kent, P.E., 1979. The emergent Hormuz salt plugs of southern Iran. Journal of Petroleum Geology, 2, 2, 117-144.
Lisle, R. J., 1987. Principal stress orientations from faults: An additional constraint. Tectonics, 1, 155-158.
Mouthereau, F., Lacombe, O. and Meyer, B., 2006. The Zagros folded belt (Fars, Iran): constraints from topography and critical wedge modeling. Geophysical Journal International, 165, 336–56.
Ramsay, J. and Lisle, R., 2000. The techniques of modern structural geology, Applications of Continuum Mechanics in Structural Geology, 3. Academic Press, London, 683
Sarkarinejad, K. and Azizi. A., 2008. Slip partitioning and inclined dextral transpression along the Zagros Thrust System, Iran. Journal of Structural Geology, 30, 116-136.
Sepehr, M., 2001. The tectonic significance of the Kazerun fault zone, Zagros fold- thrust belt, Iran. Ph.D. Thesis, Imperail College University of London, 186.
Sepehr, M. and Cosgrove, J. W., 2004. Structural framework of the Zagros fold-thrust belt, Iran. Marine and Petroleum Geology, 21, 829–43.
Talebian, M. and Jackson, J., 2004. A reappraisal of earthquake focal mechanisms and active shortening in the Zagros mountains of Iran. Geophysical Journal International, 156, 506-526.
Twiss, R.J. and Unruh, A., 1998. Analysis of fault slip inversions: Do they constrain stress or strain rate? Journal of Geophysical Research, 103, 12202- 12222.
Zalohar, J. and Vrabec, M., 2007. Paleostress analysis of heterogeneous fault-slip data, The Gauss method. Journal of Structural Geology, 29 , 1798-1810.
Zalohar, J., 2009. Program T-TECTO 3.0 Professional.
Journal of Tectonics
Volume 1, Issue 3
October 2015
Pages 97-116

Files

Share

How to cite

Statistics