Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Determination of Paleostress and trend of thrusting between Darakeh-Kan Valleys, Northern Tehran

Document Type : Original Research Paper

Authors
Hamidreza Karami 1, 2
Manouchehr Qorashi 3
Mohammadreza Abbasi 4
1 Teacher Training University , Tehran, Iran
2 University for Science and Technology of Iran, Tehran, Iran
3 Geological Survey of Iran, Tehran, Iran
4 International Institute for Earthquake Engineering and Seismology, Tehran, Iran
Abstract
The region under consideration is part of the Alpine System which is situated between Darakeh Valley in the east and Kan Valley in the west, northern Tehran. It is totally composed of Eocene Karaj Formation. The mechanism of thrust- faulting dipping towards the north in the southern portion of the Central Alborz, whereas, the thrusting of north Tehran is left- lateral movement (Tchalenko, 1975 and Trifonov, 1996). In addition, the faultings with north-south trend to north-northwest to southeast, have right- lateral movement. In this connection, a model is suggested for generation of these faults.
The study of the fractures and faults trend, particularly thrust, reverse- faults, dykes, joints and above all slickensides on fault planes, show that, two totally different attitudes of compressional trends and almost perpendicular to each other are present.
The first generation of compression is trending northwest-southeast, while the second generation of compression possesses northeast to southwest trend.
Keywords
Paleostress, thrusting, Darakeh Valley

Subjects

Alavi, M., (1996), Tectonostratigraphy Synthesis and Structural Style of the Alborz Mountain System in Northern Iran, J.Geodynamics, Vol.21, No. 1, PP. 1-33.
Aleksandrowski, P., (1985), Graphical Determination of Principal Stress Directions for Slickenside lineation Populations and attempt to modify Arthauds Method, J.Struct, Geology, Vol.7, No. 1, PP.7384.
Allenbach, P., 1966, Gelogie und Petrographie des Damavand und Seiner Umgebung (Zentral Elburz), Iran Geol. Mitt., Geol.Inst. ETH Univ. Zurich, n.s.,63,144p.
Angelier, J., 1979, Determination of the Mean Principal Direction of Stresses for a Given Fault Population, Tectonophisics, Vol. 56, PP. T 17-T 26.
Angelier, J., Fault Slip Analysis and Paleostress Reconstruction, Chapter 4 of Continental Deformation by Paull Hncock.
Armijo, R., Carey, E., Cisternes, A., (1982), The Inverse problem in microtectonics and the separation of tectonic phases, Tectonophysics, Vol.82, PP.145-160.
Asserto, R., 1966, Geological map of Upper Djadjrud Lar Valleys, (Central Elburz, Iran), Inst. Geol. Univ. Milano, Serie G, Puble. N. 232, 86P.
Beker, A., 1996, Conical Dragfolds as Kinematic Indicatores for Strike-Slip Fault Motion,J. of Structural Geology, Vol, 176, No. 11, PP.1497-1506.
Berberian, M., 1979, Contribution to the Sismotectonics of Iran Part (II), Geol., Surv. Iran, 40,570P.
Berberian, M., 1981, Active Faulting and Tectonics of Iran, in Gupta, H.K., and Delanny, F.M., (eds), Zagros-Hindu-Himalaya Geodynamic Evolution, Am. Geophys. Un. and Geol. Soc. Am., Geodynamics Series,3,33-69.
Castle, H.c., Hills, S.L. (1991) BRETE 3 an select: Quickbasic 4 Programs for Determination of Stress Tensor Configurations and separation of heterogenous population of Fault Slip Data Computer & Geoscience, Vol. 17, Vol. 17, Vol, 23-43.
Dedual, E., 1967, Zur Geologie des Mittleren und Unteren Karaj Tales, Zentral-Elburz (Iran). Eidgen Tech. Hochsch. Univ. Zurich, Mitt. Geol. Inst., N.F., 79, 123p.
Dellenbach, J., 1996, Contribution al Etude Geologique le Lar Region Situee al, eat de Tehran (Iran), Fac. Sei., Univ. Stras burg (France).117p.
Etchacopar, A., Vasseur, G., (1981), Paignieres, M. An Inverse Problem in Microtectonic for the Determination of Stress Tensor from fault striation analysis,J. Struct. Geol., Vol. 13, No. 1, PP. 51-56.
Gephart,J.W., Forsyth, D.W. (1984), An Improved Method for Determining the Regoinal Stress Tensor Using Earthquake Focal Mechanism Data Application to the Sanfernando Earthquake Sequence, J.Geophy., Res., Vol. 89, No. B11, PP.9305-9320.
Gephart, J.W., (1990), Stress and the Direction of Slipe Fault Planes, Tectonics, Vol. 1, No. 4, PP. 845-858.
Huang, Q. (1988), Computer-Based Method to Separate Heterogenous Sets of Fault - Slip Data into Sub Sets, J. Struct. Geol., Vol. 10, No. 3.
Iwao, S., Hushmand-Zadeh, A., 1971, Stratigraphy and Petrography of Low- grade Regionally Metamorphosed Rocks of the Eocene Formation in the Alborz Range, North of Tehran, Iran, J. Jap. Assoe. Pet. Econ. Geol., 65(5),265-285.
Knill, J.L., and Jones, K.S., 1968. Ground Water Conditions in Greater Tehran, Quart. J. Eng., 1, 181-194.
Lisle, JI (1988), Romsa: A basic Program for Paleostress Analysis Using Fault-Striation Data, Computer & Geosciences, Vol. 14, No. 2, PP. 255-259.
Marret, R., Allmendinger, R. (1990), Kinematic Analysis of Fault- Slip Data, J. of Structural Geology, Vol. 12, No.3, PP. 973-986.
Michael, A.J. (1984), Determination of Stress From Slip Data, Fault & Folds, J. Geophy. Res. Vol. 89, PP. 11517-11226.
Reches,Z. (1976), Analysis of Joints in Two Monoclines in Lsrael. GSA Bulletin, Vol. 87, PP. 1654-1662.
Recjes, Z. (1987), Determination of the Tectonic Stress Tensor From Slip Fault that Obey the Columb Yield Condition, Tectonics, Vol. 6, No. 6. Rieben, E.H., (1955), The Geology of the Tehran Plane, A.M., J. Sci., 253, 617-639.
Saiedy, A., Continental Accretion of the Iran Block to Eurasia as seen From Palaeozoic to Early Cretaceous Subsidence Curve, Geodynamica Acta (Paris) 1997, 10,5,
Stocklin, J. (1974), Northern Iran: Alborz Montains; in A.M. Spenser, Mesozoic - Cenozoic - Cenozoic Orogenic Belt, Geol. Soc. London. Spec. Bull. No. 6, PP. 213 - 234.
Tchalenko, J.S., (1974), Recent Destructive Earthquakes in the Central Alborz, Surv. Iran,29,97 - 116.
Tchalenko,J.S., Berberian, M., Iranmanesh, H.,Bailly, M., and Arsovsky, M. (1974), Tectonic Framework of the Tehran Region, in Materials for the study of Seismotectonics of Iran; North Central Iran. Geol. Surv. Iran, 29, 7- 49.
Tchalenko,J.s., (1975), Seismotectonic Framework of the North Tehran Fault, Tectonophysics, 29(1975), 411-420.
 
 
Scientific Quarterly Journal of Geosciences
Volume 7, 25-26
Autumn & Winter 1998, vol. 7, No. 25-26
Winter 1998
Pages 60-71