Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The role of North Tehran Fault in the creation of Central Alborz and Central Iranian Sedimentary Basins within Tehran- Karaj area

Document Type : Original Research Paper

Authors
Soheila Bouzari 1
Mohsen Pourkermani 2
Mohammad Hashem Emami 3
1 Islamic Azad University, Tehran, Iran
2 Shahid Beheshti University, Tehran, Iran
3 Geological Survey of Iran , Tehran, Iran
Abstract
The area under investigation constitutes part of the Alpine Mountain system, which is situated between Central Iran and Central Alborz in the north Iran.
In the southern sector of central Alborz thrust faults are present which are dipping towards the north. In relation to the principal thrust fault, the secondary faults development as well. The latter, probably related to the principal fault at depth. The relationship between the secondary faults with main faults are parallel or oblique and are divided into synthetic and antithetic types.
The onset of the North Tehran Fault was probably in Paleocene time, and this occurs as a secondary Musha- Fasham Fault. However, due to lack of data, it is not possible to assign the fault as an unquestionably active fault. But nevertheless, the North Tehran Fault became active about Eocene- Oligocene times, where by it was accompanied by differences in altitude between the South Alborz basin and the northern portion of central Iranian basin.
The relationship between the North Tehran fault with Musha- Fasham Fault is mainly oblique, that is why at the junction of the two faults, strike-slip occurs, as well as creation of a basin prior to the folding in the North Tehran Fault at the southern sector; and since then, each sedimentary basin in relation to the activity of the North Tehran Fault has taken its own evolutionary course.
Subjects
Andersen Torgeir, B. and Jamtveit Bjorn, 1990. Uplift of deep crust during Orogenic extensional collapse A model based on field studies in the SOGN SUNNF JORD region of western, Norway, Tectonics, V. 9, No. 5, 1097-1111.
Brink, U. and Avraham, Z., 1989. The Anatomy of a pull-apart Basin: Seismic Reflection observations of the dead sea Basin, Tectonics, Vo. 8, No. 2, 333-350.
Bartley, J. M., Fletcher J. M., and Glazner A., 1990. Tertiary extension and contraction of lower plate rocks in the central MOJAVE metamorphic core complex southern California", Tectonics, Vo. 9, No. 3, 521-534.
Bott, M. H. P, 1976. Formation of Sedimentary basins of graben type by extension of the continental crust, Tectonophysics 36, 77-86.
Beloussov, V. V. and Sholpo, V. N., 1976. Geodynamics of the eastern part of the Mediterranean Alpine belt, Tectonophysics 35, 27-43.
Berberian, M., 1983. Continental deformation in the Iran and plateau (contribution to the seismotectonics of Iran, Part IV, No. 52.
Cannon, W. F. and Green, A. G., 1989. The north American Midcontinent rift reflection profiling, Tectonics, Vo. 8, No. 2, 305-332.
Clapp, F. G., 1930. Tehran anathe Elburz, New York.
Cook, K. L., 1969. Active rift System in the basin and range province, Tectonophysics 3, 469-511.
Geodynamic project, 1983. Geotraverse in Iran, Final report, Geol. Survi. Iran. No. 51.
Mody, J. P. and Hill, M. J., 1959. Wrench fault tectonics, Bull. Geol. Soc. Am., Vo. 67, 1207-1246.
Nieto obregon, J., Urrutia Fucugauchi, J., Cabral Cano, E. and Guzman, A., 1992. Listric faulting and continental rifting in western Mexico a paleomagnetic and Structural study, Tectonophysics 208, 365-376.SIN
Nogole Sadat, M. A. A., 1989. Tectono sedimentary Zonation of Iran, 29th International geology congress, Washingtion.
Ozelci, F., 1978. A Suggestion on the possible significance of volcanic activity in the tectonics development of the eastern Mediterranean region, Tectonophysics 46, 227-237.
Pierre Brun, J. and Choukroune, P., 1983. Normal faulting block tilting and decollement in a stretched crust, Tectonics, Vo. 2, No. 4, 345-356.
Pedrami, M., 1989. The timing rate and nature of the late Quaternary tectonism in Iran, Bull, of the INQUA neotectonic commission, No. 12.
Rieben, E. H., 1966. Geological observations on alluvial deposits in northern Iran, Geol. Survi. Iran. report No. 9.
Reading, H. G., 1986. Sedimentary environments and facies, London, 471-519.
Sengor, A. M. C. A new model for the late palaeozoic- Mesozoic tectonic evolution of Iran and implication for Oman Turkey geological society, No. 49, 797-831.
Stocklin, J., 1974. Northern Iran Alborz Mountains, Tehran Iran.
Stampfli, G., Zenientti, L. and Bronnimann, P., 1976. Trias De L, Elburz oriental, Iran, Stratigraphie Sedimentologie, Micropaleontologie, Milano, 467-500.
Sussli, P. E., 1976. The geology of lower Haraz valley area, central Alborz, Iran, Geol. Survi. Iran Rep. No. 38.
Tchalenko, J. S., 1975. Seismotectonic framework of the North Tehran fault, Tectonophysics 29, 411-420.
Scientific Quarterly Journal of Geosciences
Volume 3, Issue 12
Summer 1994, Vol. 3, No. 12
Autumn 1994
Pages 12-27