Neotectonics of the Zanjan-Kazvin area, Central Iran: Left lateral strike‐slip induced restraining stepovers

The neotectonics of the Zanjan-Kazvin area are dominated by the region-wide E-W trending left lateral strike-slip faults. These faults create restraining and releasing stepovers indicating strain partitioning. Instead of the NW-SE trending long range-parallel continuous thrust faulting suggested in previous studies, this paper demonstrates that there are E-W trending range-crossing left lateral strike-slip faults creating short range-parallel thrust faults in the restraining stepovers. Establishing this strike-slip-induced structural style might contribute to an understanding of the nature of the Elburz (Alborz) Mountains located between the Central Iran and Caspian blocks.

Neotectonics of the Zanjan-Kazvin area, Central Iran: Left lateral strike‐slip induced restraining stepovers

The neotectonics of the Zanjan-Kazvin area are dominated by the region-wide E-W trending left lateral strike-slip faults. These faults create restraining and releasing stepovers indicating strain partitioning. Instead of the NW-SE trending long range-parallel continuous thrust faulting suggested in previous studies, this paper demonstrates that there are E-W trending range-crossing left lateral strike-slip faults creating short range-parallel thrust faults in the restraining stepovers. Establishing this strike-slip-induced structural style might contribute to an understanding of the nature of the Elburz (Alborz) Mountains located between the Central Iran and Caspian blocks.

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Alavi M (1991). Tectonic Map of the Middle East, Scale 1:5000000. Tehran: Geological Survey of Iran.

Alavi M (1996). Tectonostratigraphic synthesis and structural style of the Alborz Mountain system in northern Iran. J Geodyn 21: 1–33.

Allen MB, Ghassemi MR, Shahrabi M, Qorashi M (2003). Accommodation of late Cenozoic oblique shortening in the Alborz range, northern Iran. J Struct Geol 25: 659–672.

Allen MB, Kheirkhah M, Emami MH, Jones SJ (2011). Right-lateral shear across Iran and kinematic change in the Arabia–Eurasia collision zone. Geophys J Int 184: 555–574.

Allen MB, Walker R, Jackson J, Blanc EJ-P, Talebian M, Ghassemi MR (2006). Contrasting styles of convergence in the Arabia–Eurasia collision: why escape tectonics does not occur in Iran. GSA Special Papers 409: 579–589.

Ambraseys NN (1963). The Buyin-Zara (Iran) earthquake of September 1962: a field report. B Seismol Soc Am 53: 705–740.

Amidi M, Lescuyer JR, Riou R (1978). Geologic Map of the Ahar Quadrangle, Scale 1:250000. Tehran: Geological Survey of Iran.

Amini A (1997). Provenance and depositional environment of Upper Red Formation, central zone, Iran. PhD, University of Manchester, UK.

Angelier J (1990). Inversion of field data in fault tectonics to obtain regional stress. III. A new rapid direct inversion method by analytical means. Geophys J Int 103: 363–376.

Annells RN, Arthurton RS, Bazley RA, Davies RC (1975). Explanatory Text of the Qazvin and Rasht Quadrangle Map. Tehran: Geological Survey of Iran.

Ashtari M, Hatzfeld D, Kamalian M (2005). Microseismicity in the region of Tehran. Tectonophysics 395: 193–208.

Ballato P, Nowaczyk N, Landgraf A, Strecker MR, Friedrich A, Tabatabaei SH (2008). Tectonic control on sedimentary facies pattern and sediment accumulation rates in the Miocene foreland basin of the southern Alborz mountains, northern Iran. Tectonics 27: 1–20.

Barka A, Reilinger R (1997). Active tectonics of the Eastern Mediterranean region: deduced from GPS, neotectonic and seismicity data. Ann Geofis 40: 587–610.

Berberian M (1976a). Pre-Quaternary faults in Iran. Geological Survey of Iran 39: 259 –269.

Berberian M (1976b). An explanatory note on the first seismotectonic map of Iran; a seismotectonic review of the country. In: Contribution to the Seismotectonics of Iran, Part II. Geological Survey of Iran 39: 7–142.

Berberian M (1983). The Southern Caspian: a compressional depression floored by a trapped, modified oceanic crust. Can J Earth Sci 20: 163–183.

Berberian M, Qorashi M, Arzhang-Ravesh B, Mohajer-Ashjai A (1983). Recent tectonics, seismotectonics and earthquake-fault hazard study in the Greater Qazvin region. Geological Survey of Iran 57: 1–84.

Berberian M, Qorashi M, Arzhang-Ravesh B, Mohajer-Ashjai A (1993). Recent tectonics, seismotectonics and earthquake-fault hazard investigation in the Greater Qazvin region: contribution to the seismotectonics of Iran. Geological Survey of Iran 61: 1–1

Berberian M, Qorashi M, Jackson JA, Priestley K, Wallace T (1992). The Rudbar-Tarom earthquake of June 20, 1990 in NW Persia: preliminary field and seismological observations, and its tectonic significance. B Seismol Soc Am 82: 1726–1755.

Berberian M, Yeats RS (1999). Patterns of historical rupture in the Iranian Plateau. B Seismol Soc Am 89: 120–139.

Bolourchi MH (1969). Geological Quadrangle Map of Iran (Kabudar Ahang), Scale 1:250,000, Sheet D5. Tehran: Geological Survey of Iran.

Clark GC, Davies RG, Hamzehpour B, Jones CR (1975). Explanatory Text of the Bandar-e-Anzali Quadrangle Map, 1:250,000. Tehran: Geological Survey of Iran.

Davies R, Jones CR, Hamzepour B, Clark GC (1972). Geology of Masuleh, Sheet D3. Tehran: Geological Survey of Iran.

Gilg HA, Boni M, Balassone G, Allen CR, Banks D, Moore F (2006). Marble-hosted sulphide ores in the Angouran Zn–(Pb–Ag) deposit, NW Iran: interaction of sedimentary brines with a metamorphic core complex. Miner Deposita 41: 1–16.

Guest B, Axen GJ, Lam PS, Hassanzadeh J (2006). Late Cenozoic shortening in the west-central Alborz Mountains, northern Iran, by combined conjugate strike-slip and thin-skinned deformation. Geosphere 2: 35–52.

Guest B, Horton BK, Axen GJ, Hassanzadeh J, Mcintosh W (2007). Middle to late Cenozoic basin evolution in the western Alborz Mountain: implication for onset of collisional deformation in northern Iran. Tectonics 26: TC6011.

Hassanzadeh J, Axen G, Guest B, Stockli DF, Ghazi AM (2004). The Alborz and NW Urumieh-Dokhtar magmatic belts, Iran: rifted parts of a single ancestral arc. Geol Soc Am Abstr 36: 434–435. Hessami K, Jamali F, Tabassi H (2003). Major Active Faults of Iran, Scale 1:2500000. Tehran: International Institute of Earthquake Engineering and Seismology.

Hollingsworth J, Jackson J, Walker R, Nazari H (2008). Extrusion tectonics and subduction in the eastern South Caspian region since 10 Ma. Geology 36: 763–766.

Jackson J, Priestley K, Allen M, Berberian M (2002). Active tectonics of the South Caspian Basin. Geophys J Int 148: 214–245.

Landgraf A, Ballato P, Strecker MR, Friedrich A, Tabatabaei SH, Shahpasandzadeh M (2009). Fault-kinematic and geomorphic observations along the North Tehran Thrust and MoshaFasham Fault, Alborz mountains Iran: implications for faultsystem evolution and interaction in a changing tectonic regime. Geophys J Int 177: 676–690.

Masson F, Van Gorp S, Chery J, Djamour Y, Tatar M, Tavakoli F, Nankali H, Vernant P (2006). Extension in NW Iran driven by the motion of the South Caspian Basin. Earth Planet Sci Lett 252: 180–188.

Moritz R, Ghazban F, Singer BS (2006). Eocene gold ore formation at Muteh, Sanandaj–Sirjan tectonic zone, Western Iran: a result of late-stage extension and exhumation of metamorphic basement rocks within the Zagros Orogen. Econ Geol 101: 1497–1524.

Nazari H, Ritz JF, Shafei A, Ghassemi R, Salamati J, Michelot L, Massault M (2009). Morphological and paleoseismological analyses of the Taleghan fault, Alborz, Iran. Geophys J Int 178: 1028 –1041.

Nowroozi NN (1972). Focal mechanism of earthquakes in Persia, Turkey, West Pakistan and Afghanistan and plate tectonics of the Middle East. B Seismol Soc Am 62: 823–850.

Priestley K, Baker C, Jackson J (1994). Implications of earthquake focal mechanism data for the active tectonics of the south Caspian basin and surrounding regions. Geophys J Int 118: 111–141.

Reilinger R, McClusky S, Vernant P, Lawrence S, Ergintav S, Cakmak R, Ozener H, Kadirov F, Guliev I, Stepanyan R et al. (2006). GPS constraints on continental deformation in the Africa– Arabia–Eurasia continental collision zone and implications for the dynamics of plate interactions. J Geophys Res 111: B05411.

Ritz JF, Nazari H, Ghassemi A, Salamati R, Shafei A, Solaymani S, Vernant P (2006). Active transtension inside central Alborz: a new insight into northern Iran – southern Caspian geodynamics. Geology 34: 477–480.

Şengör AMC (1990). A new model for the late Palaeozoic-Mesozoic tectonic evolution of Iran and implications for Oman. Geol Soc Sp 49: 797–831.

Solaymani Azad S, Philip H, Domınguez S, Hessami K, Forutan MR, Shahpasand Z, Ritz JF (2011). The Zandjan fault system: morphological and tectonic evidences of a new active fault network in the NW of Iran. Tectonophysics 506: 73–85.

Stockli DF, Hassanzadeh J, Stockli LD, Axen G, Walker JD, Dewane TJ (2004). Structural and geochronological evidence for OligoMiocene intra-arc low-angle detachment faulting in the TakabZanjan area, NW Iran. Geol Soc Am Abstr 36: 319–320.

Stocklin J (1968). Structural history and tectonics of Iran: a review. Am Assoc Petr Geol B 52: 1229–1258.

Stocklin J, Eftekharnezhad J. (1969). Zanjan Quadrangle Map With Explanatory Text, Sheet D4, Scale 1:250000. Tehran: Geological Survey of Iran.

Stocklin J (1974). Northern Iran: Alborz Mountains. Geol Soc Sp 4: 213–234.

Tillman JE, Poosti A, Rossello S, Eckert A (1981). Structural evolution of Sanandaj–Sirjan ranges near Esfahan, Iran. Am Assoc Petrol Geol Bull 65: 674–687.

Toori M (2012). Neotectonics and seismicity of Zanjan and surrounding regions (NW of Central Iran). PhD, Ankara University, Ankara, Turkey.

Toori M, Seyitoğlu G (2011). Preliminary observations on the synsedimentary tectonic regime of the Middle-Late Miocene Upper Red Formation in Geydar Mountains (NW Iran). Yerbilimleri Bull Earth Sci 32: 171–186.

Verdel C (2009). Cenozoic geology of Iran: an integrated study of extensional tectonics and related volcanism. PhD, California Institute of Technology, Pasadena, CA, USA.

Verdel C, Wernicke BP, Ramezani J, Hassanzadeh J, Renne PR, Spell TL (2007). Geology and thermochronology of Tertiary cordilleran-style metamorphic core complexes in the Saghand region of central Iran. Geol Soc Am Bul 119: 961–977.

Vernant P, Nilforoushan F, Chery J, Bayer R, Djamour Y, Masson F, Nankali H, Ritz JF, Sedighi M, Tavakoli F (2004). Deciphering oblique shortening of central Alborz in Iran using geodetic data. Earth Planet Sci Lett 223: 177–185.

Žalohar J (2009). T-TECTO 3.0 Professional Integrated Software for Structural Analysis of Fault-Slip Data, Introductory Tutorial. Available online at http://www2.arnes.si/~jzaloh/The%20 T-TECTO%203.0%20Program%20-%20Introductory%20 Tutorial.pdf.

Turkish Journal of Earth Sciences-Cover
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