Document Type : Original Research Paper

Authors

1 Associate Professor, Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran

2 Ph.D. Student, Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran

3 Professor, Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran

4 Assistant Professor, Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran

Abstract

Located at the Arabia-Eurasia collision zone, the E-W trending Bozgoosh Mountain aligned perpendicularly to N-S trending Chehel-Nour Mountain in the northwest of the Iranian Plateau. There is not any thermochronometry study has been performed to determine the initial time of their uplift and exhumation. Our low-temperature Thermochronometry analysis in the apatite U-Th/He (AHe) system in combined with previously unpublished data set at central Bozghush Mountains and structural data show that the onset of the Late Cenozoic uplift and exhumation of the Bozgoosh Mountain (~19-25 Ma) is a bit older than Chehel-Nour - Gaflankuh Mountain (~15 Ma). It seems that deformation of the Bozgoosh Mountains started at with respect to middle Miocene unset time of deformation at Chehl-Nour and Gaflankuh Mountain. Then it can be concluded that these two perpendicular maountain ranges have not been formed in a single phase of partitioned deformation. On the other hand N-S trending Chehel-Nour and Ghaflankuh Mountains have similarly deformedsynchronous with the N-S trending part of the southern Talesh Mountains in its eastern border. Our results have also document that the Bozgoosh and Chehl-Nour mountains intersection is actually a part of Bozgoosh mountain.

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References
Agard, P., Omrani, J., Jolivet, L., Whitechurch, H., Vrielynck, B., Spakman, W., Moni_e, P., Meyer, B., and Wortel, R., 2011- Zagros orogeny: a subduction-dominated process. Geol. Mag., 148, 692–725.
Allen, M.B, Jackson, J., and Walker, R., 2004- Late Cenozoic reorganization of the Arabia- Eurasia collision and the comparison of short-term and long-term deformation rates. Tectonics 23(2): TC2008.
Allen, M.B., and Armstrong, H.A., 2008- Arabia-Eurasia collision and the forcing of mid-Cenozoic global cooling. Paleogeogr. Paleoclimatol. Paleoecol., 265, 52–58.
Axen,  G.J., Lam, P.S., Grove, M., Stockli, D.F., and Hassanzadeh, J., 2001- Exhumation of the west-central Alborz Mountains, Iran, Caspian subsidence, and collision-related tectonics. Geology 29, 559 562p.
Ballato, P., Uba, C. E., Landgraf, A., Strecker, M. R., Sudo, M., Stockli, D. F., Friedrich, A., and Tabatabaei, S. H., 2011-Arabia-Eurasia continental collision: Insights from late Tertiary foreland-basin evolution in the Alborz Mountains, northern Iran.Geological Society of America Bulletin ,123(1-2):106–131.   
Balling, P., 2014-Deformation styles and exhumation patterns in the Northern Iranian Plateau: An integrated balanced cross sections and low-temperature thermochronology (AHe and ZHe) study. [M.A. Thesis]: University of Potsdam, 81p.                                                                                                                                            
Berberian, M., 1997- Seismic sources of the Transcaucasian historical earthquakes. In: Giardini, D., Balassanian, S. (Eds.), Historical and Prehistorical Earthquakes in the Caucasus. Kluwer Academic Publishing, Dordrecht, Netherlands, p. 233–311.
Berberian, M., and Yeats, R.S., 1999- "Patterns of Historical Erthquake Rupture in the Iranian Plateau", Bulletin of the Seiamological Society of America, 20, p. 120-139.                                                                                                              
Dargahi, S., Arvin, M., Pan, Y., and Babaei, A., 2010- Petrogenesis of postcollisional A-type granitoids from the Urumieh-Dokhtar magmatic assemblage, Southwestern Kerman, Iran: constraints on the Arabian- Eurasian continental collision. Lithos, 115, 190–204.
Dodson, M. H., 1973- Closure temperature in cooling geochronological and petrologicalsystems. Contributions to Mineralogy and Petrology, 40(3):259–274.
Ehlers, T. A., 2005- Crustal Thermal Processes and the Interpretation of  Thermochronometer Data, Reviews in Mineralogy & Geochemistry  Vol. 58, pp. 315-350, 2005.
Engdahl, E. R., Jackson, J. A., Myers, S. C., Bergman, E. A., and Priestley, K., 2006 - Relocation and assessment of seismicity in the Iran region. Geophysical Journal International, 167(2):761–778.
Guest B., Axen, G. J., Lam, P.S., and 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(1), 35-52p.
Hessami, K., Pantosi, D.,  Tabassi, H.,  Shabanian, E.,  Abbassi, M.,  Feghhi, K., and Solaymani, S., 2003- Paleoearthquakes and slip rates of the North Tabriz Fault, NW Iran: preliminary results, Annals Geophysics, 46, p. 903–915.
Jackson, J., Priestley, K., Allen, M., and Berberian, M., 2002- Active tectonics of the South Caspian Basin. Geophysical Journal International 148, p. 214– 245.
Jim´enez-Munt, I., Fern`andez, M., Saura, E., Verg´es, J., and Garcia-Castellanos, D., 2012- 3-D lithospheric structure and regional/residual Bouguer anomalies in the Arabia—Eurasia collision (Iran). Geophysical Journal International, 190(3):1311–1324.
Lease, R.O., Burbank, D. W., Clark, M.K., Farley, K.A., Zheng, D., and Zhang, H., 2011- Middle Miocene  reorganization of deformation along the northeastern Tibetan Plateau. Geology 2011;39;359-362. doi: 10.1130/G31356.1.
Lisker, F.,Ventura, B., and Glasmacher, U. A., 2009- Thermochronological Methods: From Palaeotemperature Constraints to Landscape Evolution Models. Geological Society, London, Special Publications, 324, 1–23. DOI: https://doi.org/10.1144/SP324

Madanipour, S., Ehlers, T. A.,  Yassaghi, A., and Enkelmann, E., 2017- Accelerated middle Miocene exhumation of the Talesh Mountains constrained by U‐Th/He thermochronometry: Evidence for the Arabia‐Eurasia collision in the NW Iranian Plateau, Tectonics, 1538-1561.

Madanipour, S., Ehlers, T. A.,  Yassaghi, A., Rezaeian, M., Enkelmann, E., and Bahroudi, A., 2013- Synchronous deformation on the orogenicplateau margins, insights from the Arabia-Eurasia collision,Tectonophysics,608, 440–451.

Madanipour, S., Yassaghi, A.,  Ehlers, T. A., and Enkelmann, E., 2018- Tectonostratigraphy, structural geometry and kinematics of the NW Iranian Plateau margin: insights from the Talesh Mountains, Iran, American Journal of Science, Vol. 318, No.2, P. 208–245.

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

Nilforoushan, F., Masson, F.,  Vernant, P., Vigny, C., Martinod, J.,  Abbassi, M., Nankali, H.,  Hatzfeld, D., Bayer, R., Tavakoli, F., Ashtiani, A., Doerflinger, E., Daignières, M., Collard, P., and Chéry, J., 2003- GPS network monitors the Arabia–Eurasia collision deformation in Iran, J. of Geodesy., 77, p. 411–422.

Priestley, K.F., Baker, C., and 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, p. 111-141.
Reilinger, R., McClusky, S., Vernant, P., Lawrence, Sh., Ergintav, S., Cakmak, R., Ozener, H., Kadirov, F., Guliev, I., Stepanyan, R., Nadariya, M., Hahubia, G., Mahmoud, S., Sakr, K., ArRajehi, A., Paradissis, D., Al-Aydrus, A., Prilepin, M., Guseva, T., Evren, E., Dmitrotsa, A., Filikov, S.V., Gomez, F., Al-Ghazzi, R., Karam, G., 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, doi:10.1029/2005JB004051.
Rezaeian, M., 2008 - Coupled tectonics, erosion and climate in the AlborzMountains [PhD. Thesis]: Cambridge, University of Cambridge, 237 p.
Ritz, J.-F., Nazari, H., Ghassemi, A., Salamati, R., Shafei, A., Solaymani, S., and Vernant, P., 2006 - Activetranstension inside central Alborz: A new insight intonorthern Iran–southern Caspian geodynamics. Geology 34, 477–80.
Solaymani Azad, S., Dominguez, S., Philip, H., Hessami, K., Forutan, M.-R., Zadeh, M., Shahpasan, and Ritz, J.-F., 2011- The Zandjan Fault System: Morphological and tectonic evidences of a new active fault network in the NW of Iran, Tectonophysics (2011), doi: 10.1016/j.tecto.2011.04.012.
Solaymani, S., 2009- Evaluation de l'aléa sismique pour les villes de Téhéran, Tabriz et Zandjan dansle NW de l'Iran. Approche morphotectonique et paléosismologique (Doctoral dissertation, Université Montpellier 2 Sciences et Techniques du Languedoc).
Stoneley, R., 1981- The geology of the Kuh-e-Dalneshin area of southern Iran and it’s bearing on the evolution of southern Tethys, Quart. J. Geol. Soc. London, 138, p. 509- 526.
Vernant, P., Nilforoushan, F., Hatzfeld, D., Abbassi, M., Vigny, C., Masson, F., Nankali, H., Martinod, J.,  Ashtiani, A., Bayer, R., Tavakoli, F., and Chery , J. , 2004- Contemporary crustal deformation and plate kinematics in Middle East constrained by GPS measurement in Iran and northern Oman, Geophys. J. Int., 157, p. 381–398.
Westaway, R., 1990- Seismicity and tectonic deformation rate in Soviet Armenia: implications for local earthquake hazard and evolution of adjacent regions, Tectonics, 9, 477-503.
Yılmaz, Y., 1993- New evidence and model on the evolution of the Southeast Anatolian Orogen, Geological Society of America Bulletin, v. 105, p. 251-271.