Dextral transpressional deformation along the Chalderan shear zone, NW Iran

Authors

1 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Geology, Khoy Branch, Islamic Azad University, Khoy, Iran

Abstract

Chalderan shear zone (SCZ) is located 270 km north of Urmia and 868 km west of Tehran. The structural and microstructural studies show two groups of the main structure in this area. The first group includes structures related to inclined shear movements, which include: asymmetric mantled porphyroclasts, fabric C and S and mineral fish structures, and the second group is related to thrust movements that occur in this area. The inclined shear movements are created by inclined transpressional strike slip component and thrust movements are created by inclined transpressional component. There is kinematic evidence of the function of shear and transpressional stresses in this region, all of which indicate the function of a shear zone with a moderate slope mylonitic foliation to the northeast and stretching lineation to the northeast with inclined strike slip mechanism with inverted component in this region. In the study area, we proposed inclined dextral transpression strike slip model.The fact that the structures and microstructures indicating reverse shear and inclined strike slip in this zone are observed with each other indicates the occurrence of partitioning in this shear zone. This indicates that tectonic forces inclined to Chalderan shear zone deformation zone occurred due to transpressional tectonics between Arabian plate and Central Iran block in northwestern Iran.

Keywords

References

Aghanabati, A., 1998. Major Sedimentary-structural Units of Iran, Geological Survey of Iran.
Allen, M.B., Mark, D.F., Kheirkhah, M., Barfod, D., Emami, M. H., Saville, C., 2011. 40Ar/39Ar dating of Quaternary lavas in northwest Iran: constraints on the landscape evolution and incision rates of the Turkish-Iranian plateau. Geophysical Journal International 185(3), 1175–1188.
Berberian, M., 1997. Seismic sources of the Transcaucasian historical earthquakes. In: Giardini, S., Balassanian, S. (Eds.), Historical and Prehistorical Earthquakes in the Caucasus. Kluwer Academic Publishing, Dordrecht, Netherlands, pp. 233–311.
Berberian, M., 2001. Contribution to archeological data to studies of earthquake history in   Iranian plateau. Journal of Structural Geology 23, 563-584.
Dıaz Azpiroz, M., Fernandez, C., 2008. Kinematic analysis of the southern Iberian shear zone and tectonic evolution of the Acebuches metabasites (SW Variscan Ibe-rian Massif). Tectonics 24, 3137-3180.
Esmaeili, C., Khatib M.M., Nazari, H., Burg, J.P., Gholami, E., 2019.  Deep-seated gravitational slope deformation in the Siahcheshmeh pull-apart basin: along the Gailatu-Siahcheshmeh-Khoy fault. Quantitative Geomorphological Research 8(1), 1-15.
Faridi, M., Burg, J.P., Nazari, H., Talebian, M., Ghorashi, M., 2017. Active faults pattern and interplay in the Azerbaijan region (NW Iran). Geotectonics 51(4), 428–437.
Fossen, H., Tikoff, B., 2010. Extended models of transpression and transtension, and application to tectonic setting. Journal of Structural Geology 15, 413-422.
Ghasemi, A., Talbot, C.J., 2006. A new tectonic scenario for the Sanandaj-Sirjan Zone (Iran). Journal of Asian Earth Sciences 26, 683-693.
Goscombe, B., Passchier, C.W., Hand, M., 2004. Boudinage classification: end-member boudin types and modified boudin structures. Journal of Structural Geology 26, 739-763.
Haji Hosseinlou, H., 2016. Petrofabric. Islamic Azad University Khoy Branch, pp 334.
Haji Hosseinlou, H., 2019. Deformational phases introducing in the Gheris shear zone, northwestern Khoy. Tectonics Journal 3(10), 68-80.
Haji Hosseinlou, H., Solgi, A., Mohajjel, M., Pourkermani, M., 2015. Deformation partitioning in respons inclined transpression collision of Arabian plate with west Alborz-to azarbayjan block, the Khoy shear zone. Scientific Quarterly Journal, Geoscience 24, 181-196.
Jones, R., Holdsworth, R.E., Clegg, P., McCaffrey, K., Tavarnelli, E., 2004. Inclined transpression.  Journal of Structural Geology 26, 1531-1548.
Jones, R.R, Tanner, P.W.G., 1995. Strain partitioning in transpression zones. Journal of Structural Geology 17, 793-802.
Kheirkhah, M., Emami, M.H., 2010. The Origin and Evolution of Quaternary Basaltic Magmas in NW Azerbaijan (Burlan to Gonbad) using Sr- Nd Studies. Scientific Quarterly Journal, Geoscience 19, 113-118.
Passchier, C.W., Trouw, R.A.J., 2005. Microtectonis, Springer, Berlin Heidelberg, pp. 366.
Rasoulzadeh, S.A., 2015. Tectonic analysis of the Qareh kelisa area, chalderan. M.Sc thesis, University of Islamic Azad University Khoy Branch, Khoy.
Sanderson, D.J., Marchini, W.R.D., 1984. Transpression. Journal of Structural Geology 6, 449-458.
Selçuk, A.S., Erturaç, M.K., Nomade, S., 2016. Geology of the Çaldıran Fault, Eastern Turkey: Age, slip rate and implications on the characteristic slip behaviour. Tectonophysics 680, 155–173.
Solar, G.S., Brown, M., 2001. Deformation partitioning during transpression in respons to early Devonian oblique convergence, northern Appalachian orogen, USA. Journal of Structural Geology 23, 1043-1065.
Ten Grotenhuis, S.M., Trouw, R.A.J., Passchier, C.W., 2003. Evolution of mica fish in mylonitic rocks. Tectonophysics 372, 1-21.
Thorbjornsen, K.L., Dunne, W.M., 1997. Origin of thrust-related fold: Geometrics Kinematics tests. Journal of Structural Geology 19, 030-319.
Trouw, T.R.A., Rudolph, A.J., Passchier, C.W., Wiersma, D.J., 2010. Atlas of Mylonites- and related microstructures, Springer, pp.322.
Zamani, B., Masson, F., 2014. Recent tectonics of East (Iranian) Azerbaijan from stress state reconstructions. Tectonophysics 611, 61–82.
Advanced Applied Geology
Volume 12, Issue 1
May 2022
Pages 31-57

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