Document Type : Original Research Paper


Department of Geology, Ferdowsi University, Mashhad, Iran.


The Lateshur Watershed is a part of Central Iranian drainage basin located northeast of the city of Pakdasht in northeastern TehranProvince. This watershed has an elongate form and its surface area is more than 22.2 square kilometer. It is a part of central Alborz zone and geologically is composed of Neogen red beds units, Hezardareh Formation and Quaternary alluviums. Geomorphologic studies show that this watershed is within an anticline and surrounded by DahanehMountains in the south and Gara-aghajMountains in the north respectively. Structural and lithological variability have a very important role in the formation of this watershed; therefore, the watershed has the same trend as structures (NW-SE). Based on this study, the LateshurRiver has a braided pattern with gravelly bed. Sedimentological studies along rivers in Lateshur basin show that three basic factor (sudden changes in slope gradient, floods events and distributaries) are the main reasons for changes in texture of bed load sediments within the channel as well as the break in sedimentary links. Lithofacies identified in this watershed include gravelly (Gmm, Gmg, Gcm, Gt), sandy (Sp, Sm, St, Sh) and muddy (Fl, Fr). Based on lithofacies, Boundary surface and current direction architecture elements identified in main river of Lateshur basins include: (1) Gravel bars and Bed forms [Element GB], (2) Lateral Accretion deposits [Element LA], (3) Sandy bed forms [Element SB] and (4) Fine grain classtic deposits [Element FF]. Also, based an lithofacies and architectural elements, Facies models have been purposed for the Lateshur river from upstream toward downstream as fallows: Shallow gravel braided river, Gravel wandering river, Gravel bed meandering river, Sandy meandering rive and Fining grain meandering river.


Asselman, N.E.M., Middelkoop, H., 1998- Temporal variability of contemporary floodplain sedimentation in the Rhine-Meuse Delta, The Netherlands. Earth Surface Processes and Landforms. 23, 595-609.
Assereto, R., 1967- The Jurassic Shemshak Formation in Central Elburz. Iran. Rivista Italiana di Paleontalogia e stratigraphia, 74, I 1, 3-21.
Blair, T. C. and McPherson, J. G., 1999- Grain-size and textural classification of coarse sedimentary particles. Journal of Sedimentary Research, 69, 6-19.
Dedual, E., 1967- Cur geologie des mittleren und unterent Karaj-Talesh, Central Elburz. Iran. Mitt. Geol. Inst. E.T.H.U. Univ.Zurich, 76, 125 p.
Delenbach, J., 1964- Contribution a letude geologique la la region situee a lest de Tehran. Iran. Fac. Sci. Unive. Strasburg. France, 117 p.
Deynouxa, M., Inerb, C.A., Monodc, O., Karab, A., VyVkoglud, M., Manatschala, G., 2005- Sevim Tuzcu Facies architecture and depositional evolution of alluvial fan to fan-delta complexes in the tectonically active Miocene Kfprqc¸ay Basin, Isparta Angle, Turkey. Sedimentary Geology, 173, 315-343.
DiFilippo, E.L., Hammond, D.E., Corsetti, F.A., 2003- Geochemical constraints for coexisting CO2 gas hydrate and calcite: implications for sheet cracks, stromatactis, zebra and tepee-like structures. Sedimentary Geology, 160, 1-6.
Engalenc, M., 1968- Geologie, geomorphologie, hydrologie de la region de Tehran. Iran. These es sciences. Monpellier, 180 p.
Fisher, R.V., 1971- Features of coarse-grained, high-concentration fluids and their deposits. J. Sediment. Petrol, 41, 916– 927.
Ganil, M.R., Alam, M.M., 2003- Sedimentation and basin-fill history of the Neogene clastic succession exposed in the southeastern fold belt of the Bengal Basin, Bangladesh: a high-resolution sequence stratigraphic approach. Sedimentary Geology, 155, 227–270.
Glaus, M., 1965- Die geologie des gebietes  nordlieh des Kandevan passes. Zentral Elburz. Mitt. Geol., Inst. E. T. H, 48, 165 p.
Gomez, B., Rosser, B. J., Peacock, D. H. and Hick, D. M., 2001- Downstream fining in a rapidly aggrading gravel bed river. Water Resources Research, 37, 1813-1823.
Harms, J.C., Southard, J.B. and Walker, R.G., 1982- Structure and Sequence in Clastic Rocks. SEPM Short Course 9, SEPM, Tulsa, OK.
Hoey, T. B. and Bluck, B. J., 1999- Identifying the controls over downstream fining of river gravels. Journal of Sedimentary Research 69, 40-50.
Kleinhans, G .M., 2001- The key role of fluvial dunes in transport and deposition of sand–gravel mixtures, a preliminary note. Sedimentary Geology, 143, I 1, 7-132.
Kostic, B., Becht, A., Aigner, T., 2005- 3-D sedimentary architecture of a Quaternary gravel delta (SW-Germany): Implications for hydrostratigraphy . Sedimentary Geology. 181, 143–171.
Lewis, D. W. and  McConchie, D., 1994- Analytical sedimentology. Chapman & Hall, London, 197 p.
Lorenzo, CH., Dedual, E., Iwao, S. and Hushmandzadeh, A., 1987- Geological map of Tehran, One sheet, Geological Survey of Iran. Scale 1:250000.
McLaren, P., 1981- An interpretation of trends in grain size measures. Journal of Sedimentary Petrology, 51, 611-624.
Miall, A. D., 1996- The Geology of Fluvial Deposits, Sedimentary Facies, Basin Analysis and Petroleum Geology. Springer-Verlag, Berlin, 582 p.
Miall, A. D., 2000- Principles of Sedimentary Basin Analysis. Springer, (3rd ed.), Verlag, Berlin, 616 p.
Moussavi-Harami, R., Mahboubi, A. and Khanehbad, M., 2004- Analysis of controls downstream fining along three gravel-bed rivers in the Band-e-Golestan drainage basin NE Iran. Geomorphology, 61, 143-153.
Paphitis, D., Velegrakis, A.F., Collins, M.B. and Muirhead, A., 2001- Laboratory investigation into the threshold of movement of natural sand-sized sediments under unidirectional, oscillatory and combined flows. Sedimentology, 48, 645-659.
Rice, S., 1999- The nature and controls on downstream fining within sedimentary links. Journal of Sedimentary Research, 69, 32-39.
Rieben, H., 1955- The geology of Tehran plains. Amer. J. Sci, 253, I 11, 617-639.
Stocklin, J., 1974- Northern Iran: AlborzMountain, Mesozoic-Cenozoic orogenic Belt, Data for orogenic studies: Geol. Soc. London, Sp. Pub. 4, 213-234.
Sun, D., Bloemendal, J., Rea, D. K., Vandenberg, J., Jiang, F., An, Z. and Su, R., 1996- Grain-size distribution function of polymodal sediments in hydraulic and aeolian environments, and numerical partitioning of the sedimentary components. Sedimentary Geology, 152, 263-277.
Surian, N., 2002- Downstream variation in grain size along an Alpine river: analysis of controls and processes. Geomorphology, 43, 137-149.