tectonics

Many curved, large-scale structures can be seen in the eastern Iranian ranges. The Jun-Abad structural curvature is convex towards the southeast, characterized by an arclength about 20 km and an arc width of about 10 km in map view. This synform structure is similar to a half-saucer comprises in numerous thrust sheets of Eocene turbidites, pelagic and basaltic sedimentary sequences of Cretaceous and remnants of ophiolitic mélanges that have totally been undergone low degrees of metamorphism and slaty cleavage. Field surveys and mesoscopic studies indicate considerable displacement of rigid blocks including sandstone to metabasite on the underlying plastic phyllitic shale in an apparently divergent pattern outward of the synform structure. Silica veins with a plastic deformation in the place of thrusts, shear band and related duplex structures confirm this issue. The amount of movement around and inside the synform was noticeable everywhere and it does not decrease towards the center, because the core of the synform is made of an allochthonous klippe of older pelagic sediments. Conjugate faults and boudins of granite blocks represent tangential longitudinal strain around the arc, while the parasitic folds mark the inner arc shrinkage. The mentioned evidence show that the curvature is probably of the orocline type. The synform has occurred simultaneously with the general buckling in the late Paleogene of the eastern Iran. This arcuate structure has developed iron-bearing silica zones, serpentinite peridotites impregnated with copper carbonates, and gold/manganese zones in a half-ring-shaped pattern which is an effective model for future explorations.

The folded Zagros is a part of the active Zagros belt in the southwest of Iran. This area has main faults and active rock formations, the activity of these faults has somehow affected the strata and sediments of different geological periods. In this study First, by studying satellite images and aerial photographs, five locations were selected in different parts of Fars and the hinterland of Bandar Abbas, and finally, the tectonostratigraphy of these locations was compared with each other. The sinology column and the paleogeographical map of these regions in the Miocene period were reconstructed Using the data obtained from five places of folded Zagros (Bastak, Bahar anticline, Arjan plain, Saadi mountain and Yasouj). The obtained results and the resulting diagrams were obtained using the RockWorks geological program. the minimum and maximum stratified thicknesses of the Miocene period formation in these five studied points are related to Arjan Plain and Saadi mountain sections By comparing the obtained results and the Hesar diagrams and the isopach map. It was done between the studied locations, which shows the highest thickness of this formation in the Arjan plain section and the lowest thickness is in Saadi Mountain. The facies changes of sedimentary rocks of the Miocene period seem to be due to the operation and activity of bedrock faults such as Kare Bes, Sabzpushan, Sarvestan and Kazeron faults in this region.

Diapir is a process in which material with a lower specific weight rises from the upper layers, breaks them and appears on the surface of the earth. In this process, the type of salt's response to the applied stresses creates specific geomorphological forms, which study is important due to the presence of oil resources, the establishment of human settlements, and the passage of communication routes.Failure to pay attention to salt diapirism studies in construction projects can cause their failure.In this research, which was conducted with the aim of investigating the geomorphology caused by salt diapirs, in the south of Semnan privance and with field, library and Remote Sensing methods, it was found that salt deposits cause the creation of specific geomorphological structures and shapes through the creation of tension. local cracks, surface dislocations and tensile fractures.Also, the fluidity of salt has been created on the surface structures and their dimensions are effective, and these structures, in turn, create local forces and control the morpho-geo-structural situation of the region.In addition, the dissolution process has played an important role in the formation of salt karsts in the region and has created significant shapes.Based on this, the geomorphological forms resulting from the Salt diapirismof the region were identified and in three groups of building forms including salt domes, salt anticlines and salt walls, salt karsts including dolines, ponors, karns and forms resulting from hydrological processes including valleys, springs, salt fluxes and salt glaciers were classified.

Sefidabe and Hyderabad antimony ore deposits are located in the southwest of Sefidabe and in the Sistan Suture Zone .In order to structural analysis of these areas, at first, using satellite images, tectonic lineaments were extracted and the areas with the highest density of length and direction were determined. Then, in the field surveys, veins, faults and mineralization occurred along them were taken. By using stress analysis software, the direction of the principal stresses in the area and the relationships between these structures, tectonic faults and mineralization were analyzed. Compressive shear zones with a northwest-southeast trend are caused by a constraining bend formed between the two of Neh and West-Asagi main faults, is the main factor of mineralization in the study area. This positive flower structure has strongly affected the Paleogene sedimentary and igneous rocks of the region. The Moore's circle indicate a compressional to wrench tectonic regime with the maximum stress direction (03/215) in the northwest-southeast. In this stress regime, in addition to thrust faults, a group of conjugate faults with an acute angle and tensile fractures aligned with the direction of maximum principal stress have formed, which have provided a suitable environment for fluid injection by creating weak zones.

Inselbergs are special forms of desert areas that give a special face to the morphology of these areas. The study of these forms is essential in terms of tourism, climate change and regional development. Among the factors influencing the formation of inselbergs the role of tectonics seems to be important. In this study, which was conducted by field and library studies with the aim of studying the inselberg of Safi Abad plain, we identified 20 inselbergs and concluded that the activity of regional faults in the Miocene period, the heights Poshte Bahram, the primary nucleus of inselberg in this plain Has created. In this plain, there were six thrust faults along the northwest-southeast and a slope between 30 and 50 degrees. These faults have provided the initial conditions for the formation of inselberg by moving and giving height to geological formations. The effect of faults in the formation of inselberg of this plain is not the same, in the northern part due to the confrontation of faults and erosion processes, the typical inselberg has been formed. In the middle part, due to the superiority of tectonic activity, the inselbergs have a rough and unglazed state, and in the southern part, due to the superiority of erosion, polished inselbergs have formed. In addition to the faults of Safi Abad plain, the activity of Aladagh highlands faults in the northern neighborhood of this plain, by affecting the catchment area of the Grati River, has been applied to the inselberg of this plain.

The study area is in the north of Chelgard city, the central part of Koohrang city in the west of Chaharmahal and Bakhtiari province. The purpose of this study is to evaluate the tectonic evidence related to the activity of Koohrang fault in Zardkooh heights. In this study using indicators Hypsometric integral morphometry (Hi), Drainage basin asymmetry (Af), River gradient (SL), The shape of the basin (BS) is calculated. In order to determine the relative tectonic morphological activity in the study area, The relative active tectonics index (IAT) has been calculated. The map shows the resulting zoning index (IAT) New tectonic activities have not been the same everywhere in the region Basins with different New construction activity are scattered in the area In general Koohrang fault and its sub-faults are active in some sections and basins, according to the obtained results, the area has moderate to low tectonic morphological activity.