SH. Gholipouri; P. Ghazanfari; M. Almasian; N. Jalali
Abstract
Vardeh drainage basin is located at north of Karaj and belongs to Central Alborz structural zone and its climate is semi-humid. The area of Vardeh basin is 68,97km2. Formations in this basin mainly include shale, tuffaceous shale, tuffaceous sandstone and limestone. The age of Kahar Formation is Precambrian, ...
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Vardeh drainage basin is located at north of Karaj and belongs to Central Alborz structural zone and its climate is semi-humid. The area of Vardeh basin is 68,97km2. Formations in this basin mainly include shale, tuffaceous shale, tuffaceous sandstone and limestone. The age of Kahar Formation is Precambrian, the oldest formation and quaternary alluvial deposits are the youngest deposits at this basin. The aim of this study is Investigation of susceptibility of formations to erosion with qualitative methods, assessment of physiographic and geomorphology and quantitative ways, MPSIAC model and sedimentary yield. In this research, library studies, field surveys, interpreting Arial photos were carried out. The collected data taken into account from geometry factors, in V1 sub – basin minimum slope and altitude and in v7-2 maximum slope and altitude. Vardeh basin is divided into mountain (M,m), hills(h), and alluvial deposit (Qal,Qt). Mio fancies forms the most area of the basin. In MPSIAC model the effect of nine and EPM model the effect of 4 important factors on soil erosion and sediment yield were evaluated. Numerical values were assigned to them in terms of intensity and weakness of each factor. Using the sum of those values different factors, the amount of sediment yield in basin was calculated as Qs= 0.253e0.036R and finally the map for each of the 9 factors were prepared in Arc GIS environment. According to identifying sub- basins with high sediment yield, V2 and V3 sub- basins deposit and this basin shall be among first priority for soil protection planning.
N. Kharazizadeh; M. Almasian; Sh. Sherkati
Abstract
Geometric style and deformation analysis of folding are two important aims of geological studies in Zagros, which is related to concentration of considerable of hydrocarbon reservoirs in anticlinal traps of the belt. In this study, evolution and geometry of Aghajari subsurface anticline (Dezful embayment) ...
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Geometric style and deformation analysis of folding are two important aims of geological studies in Zagros, which is related to concentration of considerable of hydrocarbon reservoirs in anticlinal traps of the belt. In this study, evolution and geometry of Aghajari subsurface anticline (Dezful embayment) is considered based on 3D seismic data and well information. Based on illustrated structural cross sections, special attention was paid to geometrical variations of folding from fold pericline to central part of this structure. Geometrical complexity along and normal to the fold axis is related to implication of intermediate soft units in sedimentary pile. Fold evolution analysis shows limb rotation and hing migration which are the main mechanism for fold growth and passing from box to chevron style as well. Development of satellite structure around main anticlines in Zagros is promising features for hydrocarbon entrapment, which related to involment of decollement levels in folding.
S. Bahiraie; M. Abbasi; M. Almasian
Abstract
Generally the most important factor in the structural evolution of Alborz is thrust and reverse faulting that often has an east-west trend, parallel to the mountain chain. Mosha fault, one of the main faults, in this study covers the area between longitudes 51˚, 30´ to 51˚, 45´ including ...
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Generally the most important factor in the structural evolution of Alborz is thrust and reverse faulting that often has an east-west trend, parallel to the mountain chain. Mosha fault, one of the main faults, in this study covers the area between longitudes 51˚, 30´ to 51˚, 45´ including central-western part of Mosha fault. The stress evolution on the available faults in northeast of Tehran city was studied by means of inversion of 120 striated fault planes and related striations. Finally, two different movement systems were identified. One of them generated dextral reverse faulting and the other one which is younger created sinistral reverse faulting. The dextral system, known to resulted from the movement of the Arabian plate toward the north, is determined to be Miocene and probably older. The sinistral system originates from structural transition of AlborzMountain (progressive deformation in Alborz). Obtained result shows that the movement vector on the thrust Mosha is the consequence of the combination of sinistral and reverse faulting. The ages of stress changes were determined by using the cross cutting
