The geometrical investigation of Tafresh fractures with emphasis on joint studies
Paper Details
The geometrical investigation of Tafresh fractures with emphasis on joint studies
Abstract
Studied area, is an ancient structure of Central Iran which is located between the central Zagros and Alborz. Numerous fractures can be seen in the Tafresh area. Base on studying on this area, fractures of Tafresh was affected by a major fracture process zone in central Iran and the southern part of Alborz. Although many researchers have been done over the Tafresh area, but due to the complexity of the geological and specific conditions of topography, Geometric studying of joints and fractures of tafresh has not completely done. This paper examines the fracture based on geometry and kinematics and spatial distribution of folds and joints using joint study techniques. Fieldwork was done, at 36 Stations – 498 joints – and during 35 days, using Clark compass. At each station bedding, Attitude, spacing, opening, filling, shape and dimensions of the joint sets plus their relationship to one another and other structures such as faults and folds were done using the selection method (Nickelsen and Hough, 1967) and directory (Davis 1984), Which are fast with measuring and statistical calculations. Joint sets were classified based on the concentrations of the poles to the joint surfaces. The analysis shows that joint sets J1 are main stress on the Tafresh zone and J2 and J3 joint sets show the sheer stresses. The main stress tends the northeast of the area that is perpendicular to the main fault of Tafresh. The statistical analyses show three categories of joint set (J1,J2 & J3) in the region in which J1 is main stress on the Tafresh Zone and J2, J3 joint sets are the sheer stresses.
Alien M, Jackson J, Walker R. 2004. Late Cenozoic reorganization of the Arabia_ Eurasia Collision and the comparison of short-term and long-term deformation rates. Tectonics 23, 1-16.
Arab AR, Lashgarpur R. 2004. The statistical evaluation of joints in superficial facies of the base of Shi Kalak Dam of Chabahar, Annual Research Journal of Sistan-Balochestan.
Hajian H. 1977. A 1:100,000 map of Tafresh, Geological and Mineral Exploration Organization of Iran. Tehran.
Hajian J. 1997. A geology of Arak, Geological and Mineral Exploration Organization of Iran: Tehran.
Hajian J. 2002. A geology of Tafresh, Geological and Mineral Exploration Organization of Iran: Tehran.
Imam MH. 1992. A description of rectangular geological map of Ghom with a scale of 1:250,000, 6. Publication of Geological and Mineral Exploration Organization of Iran: Tehran.
Imami MH, Amini B. 1992. A map of Farmahin with 1:100,000 scale. Publication of Geological and Mineral Exploration Organization of Iran: Tehran.
Jamali-Ashtiani R, Toti F, Hassanzade J. 2010. The lithology and geochemistry of eocene green tuffs of northern part of Tafresh, Quarterly of Geology of Iran 12, 39-50.
Jamei AR. 2006. A morphological study of trend change in Central Alborz on the volcanic belt in the area of Tafreshtown. M. S Dissertation, University of Shiraz Press.
Kheirkhah HR. 1995. The geomorphological characteristics of Tafresh low-lands.M.S. Dissetation, Shahid Beheshti University.
Nazari H. 2006. Analyse de la tectoniquerécente et active dansl’Alborz Central et la région de Téhéran: «Approchemorphotectonique et paléoseismologique. PhD Thesis, Science de la terreet de 1’eau. Montpellier, Montpellier IT. 247.
Rajabion J, Mahjal M. 2004. The structural analysis of volcanic-sedimentary deposits of Urmia-Dokhtar Basin in Tafresh Zone: An evidence of transpressivetectonics. The Twenty Second Conference of Geological Sciences.
Rajabion J. 2005. The study and analysis of fracturing deformation in Tafresh Zone with emphasis on Dirin Stress. M. S Dissertation. Faculty of Basic Sciences, University of Tarbiat-Modares.
Shafei AR. 2012. The strain stress analysis of Karaj Formation through joint study. M.S Dissertation, Islamic Azad University of Research and Science Branch.
Tokhmchi B, Memarian H, Ahmadi Nobari H, Mashiri B. 2010. The introduction of a new method to rank joints with the optimal approach is Bayesian classification. Quarterly of Sciences of Earth 7, 112-115.
Toti F, Jamali-Ashtiani R, Hassanzade J. 2008. Mineralogy of chlorite and its genesis in green Eocene tuffs in northern area of Tafresh Zone. The Fifteenth Symposium of Crystallography and Mineralogy of Iran, Publication of Ferdowsi University of Mashhad 181-186.
Pegah Shahverdi, Alireza Farokhnia, Ali Sorbi (2015), The geometrical investigation of Tafresh fractures with emphasis on joint studies; JBES, V6, N6, June, P540-551
https://innspub.net/the-geometrical-investigation-of-tafresh-fractures-with-emphasis-on-joint-studies/
Copyright © 2015
By Authors and International
Network for Natural Sciences
(INNSPUB) https://innspub.net
This article is published under the terms of the
Creative Commons Attribution License 4.0