Late Cenozoic Faulting at Ziar Area in Central Alborz

Document Type : Research Paper

Authors

Department of Geology, Tarbiat Modares University, P. O. Box: 14115-175, Tehran, Iran

Abstract

Field investigation and structural mapping of faults cut Mezozoic to Late Cenozoic (PlioceneQuaternary) rocks in Ziar area of Central Alborz have led to identification of the NW- and NE- trending
fault sets. Slickenlines, fault steps and riedel shear fractures are mainly applied as kinematic indicators
for analysis of the faults mechanisms. The NW-trending reverse faults with left-lateral strike-slip
kinematics and positive flower structure geometry (such as Golezard Fault) is the first set. This set cut
through all rock formations up to Plio-Quaternary are proposed to develop during the northeastern
oblique transpression deformation governs the Alborz during the final collision of the Arabian- Eurasian
plates in Late Cenozoic (Pliocene). The NE-trending strike-slip faults with normal kinematics that crosscut the Damavand Quaternary volcanic rocks as well as the first faults set are the youngest faults in the
region. This fault set development have attributed to the northwestern movement of the South Caspian
block in Quaternary, which led to an extension in Central Alborz. These young faults mapped for the
first time in this work constrain the Late Cenozoic (Quaternary) faulting of Central Alborz zone, referred
as a result of the range major faults reactivation, previously. 

Keywords

Main Subjects


Article Title [فارسی]

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Alavi, M., 1992. Sedimentary and structural characteristics of the Paleo Tethys remnants in northeastern
Iran. Geological Society of America Bulletin, 103: 9183-9192.##
Allen, M. B., Ghassemi, M. R., Shahrabi, M., Qorashi, M., 2003. Accommodation of late Cenozoic
oblique shortening in the Alborz range, northern Iran, J. Struct. Geol. 25: 659- 672.##
Berberian, M., Yeats, R.S., 1999. Pattern of historical earthquake rupture in the Iranian plateau. Bulletin
of the Seismological Society of America, 89: 120-139.##
Djamour, Y., Vernant, P., Bayer, R., Nankali, H.R., Ritz, J.F., Hinderer, J., Hatam, Y., Luck, B., Le
Moigne, N., Sedighi, M. and Khorrami, F., 2010. GPS and gravity constraints on continental
deformation in the Alborz mountain range, Iran. Geophysical Journal International, 183(3): 1287-
1301.##
Guest B., Stocklin, D. F., Grove, M., Axen, G. J., Lam, P. S. & Hassanzadeh, J., 2006b. Thermal
histories from Central Alborz Mountains, northern Iran. Implications for the spatial and temporal
distribution of deformation in northern Iran. Geological Society of America Bulletin, 118: 1507-
1521.##
Jackson, J., Priestley, K., Allen, M., Berberian, M., 2002. Active tectonics of the South Caspian Basin.
Geophysical Journal International, 148: 214-245.##
Leng, W., and Shijie Zhong, S., 2010. Surface subsidence caused by mantle plumes and volcanic loading
in large igneous provinces. Earth and Planetary Science Letters, 291: 207-214.##
Ritz, J.-F., Nazari, H., Ghassemi, A., Salamati, R., Shafei, A., Solaymani, S., Vernant, P., 2006. Active
transtension inside Central Alborz: A new insight of the northern Iran-southern Caspian
geodynamics. Geology, 34: 477-480.##
Stocklin, J., 1974. Northern Iran: Alborz Mountains, in Spencer, A.M., ed., Mesozoic-Cenozoic
orogenic belts; data for orogenic studies; Alpine Himalayan orogens. Geological Society [London]
Special Publication, 4: 213-234.##
Saberi, E., Yassaghi, A., 2017. Djamour, Y. Application of geodetic leveling data on recent fault activity
in Central Alborz, Iran. Geophysical Journal International, 211(2): 751-765.##
Vernant, Ph., Nilforoushan, F., Chery, J., Bayer, R., Djamour, Y., Masson, F., Nankali, H., Ritz, J.-F.,
Sedighi, M., Tavakoli F., 2004. Deciphering oblique shortening of Central Alborz in Iran using
geodetic data. Earth and Planetary Science Letters, 223: 177- 185.##
Yassaghi, A., Madanipour, S., 2008. Influence of a transverse basement fault on alongstrike variations
in the geometry of an inverted normal fault: Case study of the Mosha Fault, Central Alborz Range,
Iran. Journal of Structural Geology, 30, 12: 1507-1519.##
Yassaghi, A., Naeimi, A., 2011. Structural analysis of the Gachsar sub-zone in Central Alborz range;
constrain for inversion tectonics followed by the range transverse faulting. International journal of
earth sciences, 100(6): 1237-1249.##