Writers : Alami,Saif Allah;Poursoltani, Mehdi Reza; Moosavi, Seied Mohammad Javad
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

The Baz-e-Hour watershed is located in the center of Khorasan –e- Razavi province. This area has been located between Binaloud geological zone in the north, and Central Iran zone in the south, which influenced by tectonical and erosional causes and composed of Marl, Sandstone and green Tuffa (Eocene) but main part of this region especially in south are formed by Ophiolite. This watershed has an elongate form and its surface area is more than 129.22 square kilometer. Based on this study, the Baz-e-Hour River has a braided pattern with gravely bed. Sedimentological studies along rivers in Baz-e-Hour 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 sediment within the channel as well as the break in sedimentary links. Mafic and ultramafic rocks are the main source of this sediment. Lithofacies which identified in this watershed include gravelly (Gmm, Gmg, Gcm), sandy (Ss, Sh, Sm) and muddy (Fm, Fl, Fr, Fsm). Based on lithofacies, boundary surface and current direction architecture elements identified in main river of Baz-e-Hour basins include: 1) sediment gravity flow deposits, (Element SG) 2 - lateral accretion deposits , (Element LA)، 3- sandy bed form deposits (Element SB) 4- overbank fines (Element FF). Also, based on litofacies and architectural elements, Facies models have been purposed for the Baz-e-Hour river from upstream toward downstream as follows: 1) gravel braided river with sediment gravity flows, 2 - gravel bed meandering river, 3- sandy meandering river and finally, 4- fining grain meandering river. This information can be applied in sedimentary studies and watershed management in khorasan -e- Razavi and Iran.

Subject List : Lithofacies, Lithofacies