Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The Effect of Main Recent Fault on Forming of Quaternary LakesCase Study: Ancient Zayandehrood, Kakolestan and Azna Lakes

Document Type : Original Research Paper

Authors
R. Sharifi Najafabadi 1
M. Moairy 1
H. A. Ghayoor 1
H. Safaei 2
A. Seif 1
1 Department of Geography, Natural Geomorphology Faculty, University of Isfahan, Isfahan, Iran
2 Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
10.22071/gsj.2011.54455
Abstract
One of The important subjects about Zagros mountain  range is the lack of coordination between its drainages and geologic structure. This subject on Zayandehrood drainage system has become one of the most challenging discussions and three different theories have been proposd . To remove these disagreements and to achieve a general conclusion, this basin and two basins of Azna and Kakolestan at a distance of 62 and 85 km form its north east limit were studied exactly in library and in the field. With referrer to different evidence obtained from the condition of river terraces, lake sediments and fossils, cirques and glacial sediments and active tectonic, it may be concluded that during  Pliocene the Zagros  drainages have been flowing toward Persian Gulf, but this drainages have been trapped because of the activity of Main Recent Fault at late this period or Early  Pleistocene  and formed some lakes. Later as the result  of some processes that most of them have been of tectonic origin, the bed of these lakes were disintegrated and the water stream was flowed in Kakolestan and Azna’s basins at the previous direction and in Zayandehrood basin at the revers direction.                                                  
Keywords
Zagros mountain range
Main Recent Fault
Quaternary lakes
Zayandehrood Basin
Active Tectonics
Referance
 Oberlander, T., 1968 - The Zagros streams: a new interpretation of transverse drainage in an orogenic zone, Distributed by Syracuse University Press, the University of California, 168 pages.
Samari,  H., Farid Mojtahedi, A., Soroush,  M. & Heidari, A., 2005- "Rudbar Lorestan Dam & Hydro plant: Challenging Seismicity      Conditions",Hydropower Conference,Oct 20 A.; 05, Villach, Austeria
Talebian, M. & Jackson, J., 2002-Offset on the Main recent of NM Iran and implications for the late Cenozoic Tectonic Of The Arabia-Eurasia Collision Zone,Geophys.j.Int.,150,422-439.
Tchalenko, J. S. & Braud, J., 1974- Seismicity and structure of the Zagros: the Main Recent Fault between 33˚ and 35˚ N. Phil. Trans. R. Soc. Lond., A., 277, 1-25.
Wellman, H. W., 1966- Active Wrench fault of Iran, Afghanistan and Pakistan: Geo. Rundsch, 55,716-735.
Scientific Quarterly Journal of Geosciences
Volume 21, Issue 82
Autumn 2011
Pages 187-194