Ebrahim Gholami

• Phd
• Head of Department at University of Birjand

The eastern Iranian range, known as the Sistan suture zone in the past, has recently been identified as the Sistan orogen. This Paleogene orogeny is located between the Lut and Afghan microcontinents. The structural analysis shows that most of the thrusts dip towards the NW so that the Permo-Triassic sediments and Jurassic micro-diorites of the Lut...

In this paper direction of stress tensors and stress ellipsoids shape in Neogene, Paleogene, and older units were investigated. Moreover, relationship between shape of stress ellipsoid and exhumation of igneous units were determined using analysis of stress tensors. Analysis of relationships between stress regime and uplifting indicate that in the...

To structural analysis of the Arc region folds, two geological profiles and balanced cross-sections across the A-Aʹ and B-Bʹ profiles were constructed. Calculating of the shortening within the Arc region indicates that shortening across the A-Aʹ profile is about 14% and across B-Bʹ profiles is about 10%. Analysis of the fold shapes indicates that f...

The interaction of the faults, which is from the existence of different structural trends to special trends (N-S) in the region of Arian Shahr and Eastern Iran, becomes an important factor in creating deformation. One of the prominent fault zones in the studied area is the left-lateral strike-slip of Arin Shahr with N76 . Under the influence of the...

The dominant tectonics in the eastern part of Iran is strike-slip. Furthermore, there is a complex pattern of fractures, alteration and magmatism in this part of Iran. Due to the northeast-southwest compression component in the east of Iran, the north-south fault zones, such as the Shushak fault, will operate with a dextral mechanism. Deformation i...

The Sistan suture zone comprises the boundary between Lut and Afghan blocks. The north-south shear between Iran and Afghanistan is accommodated by several right-lateral strike-slip fault systems. The study area (northern Birjand Mountain range) is a part of Khousf splay; the most important faults in the Khousf splay are sinistral with reverse compo...

Introduction: The East Iran orogen has experienced multiple buckling phases resulting in the formation of strike-slip fault splays. The geometric and kinematic characteristics of these splays are influenced by folding mechanisms. This study focuses on investigating the structural characteristics and tectonic evolution model of the Khousf splay, loc...

This research assessed stress regimes and fields in eastern Iran using fault-slip data and the tectonic events associated with these changes. Our stress analysis of the brittle structures in the Shekarab Mountains revealed significant changes in stress regimes from the late Cretaceous to the Quaternary. Reconstructing stress fields using the age an...

The study area is located in the northeast of the Lut block between Nehbandan and Nayband fault zones; that in addition to sedimentary units and Cretaceous ophiolites, a wide range of Paleogene and Neogene sedimentary facies and pyroclastic sediments have been affected by deformation. Structural trends of the study area include two main groups with...

Structurally Lut zone is include of the four main trends that N-S and NE-SW trends are more prevalent in the northwest, as well as the magnetic trends confirm these structural trends. In terms of mineralization, the most important parts are related to the eastern and western parts of the Nayband fault zone. The most important mineralizations observ...

The study area is located in the Eastern Alborz. The almost western Esfarayen faults are the trust type and have the NW-SE trend; these faults created fault scarps and along them Jurassic limestones and shales are trusted on the Esfarayen plain. In this study, using geological maps and satellite images active tectonic was studied in the northwester...

Recognizing of the tectonic effects in the rivers and fluvial deposits represents a valuable tool for active tectonic studies. Studying of stream channels and their associated deposits which displaced by faulting are important to revealing the movement values and timing of the last few earthquakes and they are critical to evaluating future earthqua...

In this paper, faults, one of the most important causes of geohazards, were investigated from a kinematic and geometric viewpoint in the northern part of the Sistan suture zone (SSZ), which serves as the boundary between the Afghan and Lut blocks. Furthermore, field evidence was analyzed in order to assess the structural type and deformation mechan...

In the Crete dam's region in the South Khorasan and in the trend of Nayband fault zone, like almost engineering structures, various fractures related to folds and fault zones can be seen that are scattered in different directions. But one of the most common types of fractures is tensile fractures. Although the Nayband fault zone has a dominant righ...

In the Central part of the Kopeh Dagh, there are a set of active right-lateral strike-slip faults that obliquely intersect the range and cause displacement in geomorphological and geological structures. In order to evaluate the rate of tectonic activities in the Central Kopeh Dagh, T, SL, Vf, HI and RIAT morphometric indices were evaluated. The ave...

سنگ¬های آذرین در راستای پهنه گسلی نهبندان یکی از منابع بی پایان انرژی در خراسان جنوبی هستند. ‌واحدهای سنگی زیرپهنه سیستان در استان¬های خراسان جنوبی و سیستان و بلوچستان، مجموعه ای از واحدهای دگرگونی، رسوبی، آذرین و آذرآواری¬ها هستند که در اثر فعالیت پهنه اصلی گسل نهبندان و سرشاخه¬های آن دچار دگرشکلی و برش خوردگی شدید شده اند. واحدهای آذرین مربوط به...

کوه¬های باقران (از قبیل گسل موجود در مرز کوه–دشت)، بارهای استاتیک و بار دینامیک ناشی از زمین لرزه خطر لغزش و ریزش در منطقه هاونان بخصوص در فصول بارندگی را چندین برابر افزایش داده است. در این منطقه پریدوتیت¬های سرپانتینیزه نقش اساسی را در فرایند زمین لغزش ایفا می¬کنند. اختلاف ارتفاع بین بخش جنوبی تا بخش شمالی و با فاصله¬ی کمتر از یک کیلومتر در حدود...

In order to evaluate the level of tectonic activities in the Shekarab Mountains, several geomorphic indices such as stream length gradient index (SL), valley floor width to valley height ratio (Vf), hypsometric curve (Hc), hypsometric integral (Hi), drainage basin shape (Bs), and relative tectonic activity (Iat) were calculated. Vf values show fast...

The chromite of Chahpangsar is located in the South Khorasan province, east of Sarbisheh, within ophiolite complex, in the direction of a branch of the Nehbandan strike-slip fault zone. Due to the activity of East Nazdasht fault (Zelzeleh Mountain) with north-south direction up to N10W, 80NE and the right- lateral strike-slip faults ophiolite units...

Eastern Iran, including the Sistan suture zone, comprises the boundary between Lut block and Afghan block. This research aims to reconstruct the stress regime evolution from the upper Cretaceous to Quaternary based on the brittle tectonic analysis. In this study, three episodic changes in stress regimes were recognized in the Shekarab Mountain usin...

Transverse fault performance in inter-basin water transfer: a case study from the central Zagros Mountains, Iran

Geometry and kinematics of deformation across the Nehbandan Fault System (NFS) have been studied in the Bibimaryam and Damdameh areas in the Sistan Suture zone (SSZ). Nearly vertical fault planes with sub-horizontal lineations and correlation of these faults analysis with anisotropy of magnetic susceptibility (AMS) indicates a predominantly transpr...

Geometry and kinematics of deformation across the Nehbandan Fault System (NFS) have been studied in the Bibimaryam and Damdameh areas in the Sistan Suture zone (SSZ). Nearly vertical fault planes with sub-horizontal lineations and correlation of these faults analysis with anisotropy of magnetic susceptibility (AMS) indicates a predominantly transpr...

استفاده از شاخص¬های ژئومورفیک برای مطالعه¬ی مناطقی که بالاآمدگی و دگرریختی سریع تکتونیکی را تجربه کرده¬اند مفید می¬باشد. کوه¬های شکراب در قسمت شرقی ایران و شمال زون زمین¬درز سیستان قرار دارد. هدف از این پژوهش بررسی مورفوتکتونیکی کوه¬های شکراب است. در این پژوهش برای ارزیابی میزان فعالیت تکتونیکی از عملیات صحرایی و شاخص¬های ژئومورفیک شامل: نسبت عرض ک...

کوه¬های شکراب در قسمت شمالی شهرستان بیرجند قرار دارد و دارای طول جغرافیایی ́37 ˚58 تا ́16 ˚59 و¬ عرض جغرافیایی ́50 ˚32 تا ́09 ˚33 می¬باشد و یکی از سرشاخه¬های انتهایی گسل نهبندان می¬باشد که در شرق ایران و زون زمین¬درز سیستان قرار دارد. هدف از این پژوهش بررسی ارتباط بین تغییر میدان تنش و فرآیش در کوه¬های شکراب است. در این پژوهش برای شناسایی گسل¬ها و...

Shekarab Mountain is located in the East of Iran and north of Sistan suture zone. Aim of this research is investigating effect of faults mechanism on structural evolution of Shekarab Mountain. In this study for investigating of structural evolution cross section drowing were used. In this research for evaluation rate of tectonic activity morphometr...

Study area (Shekarab Mountains) is located in Sistan suture zone. The aim of this research is to investigate the variation of stress pattern (direction of stress tensors and stress ellipsoids shape) in Neogene units, Paleogene units and older units. In this research characteristics of brittle structures (faults) were interpreted using Win-Tensor so...

Landscape evolution represents a morphotopographic balance resulting from interactive competition between tectonics and climate. The development of geomorphic features in response to tectonic uplift provides important information regarding nature, spatial and temporal distributions of tectonic forces in contractional and extensional tectonic regime...

1- Introduction During the evolution of orogenic belts in collisional zones, rock units undergoing deformation. Deformation is the transformation from an initial to a final geometry using rigid body translation, rigid body rotation, strain (distortion), and/or volume change (Dilation) (Ramsay and Huber, 1983). Folding, faulting, and layer-parallel...

The Shekarab fault system, located in the north of the Birjand city, has fault scarps parallel to main fault. Due to the structural features, mechanism of fault trends in the region, fault-related folding and the occurrence of the migration from the north to the south at Shekarab fault, modeling is done for the geometric pattern of the fault propag...

The north-west Birjand area tectonics is mainly affected by performance of western part of the Shekarab fault Zone. The results of the morphotectonic indexes include Smf,Vf, Er, SL, suggesting high amounts for SL (707) and Er (0.58) and lower values for Vf (0.94) and Smf (1.14), with neotectonic evidences such as cutting and tilting in Quaternary s...

Study area is located in the north east Iran, north shirvan fault zone. In the study area there is fault related folds that are displaced by right lateral strike slip faults. In this research, active tectonic of north shirvan fault zone were investigated by using geological maps, seismic data and analog model. Active tectonic investigations of stud...

Microstructural analysis and microthermometry are useful methods for determining the deformation evolution. To address this issue, rheological behavior of quartz, feldspar and calcite in veins and host rocks during deformation, are presented in the mylonite zone of the dextral reverse Zamanabad Shear Zone (ZSZ), in northern part of Sistan Suture Zo...

In this paper we tried to identify the main tectonic lineaments in Eastern Iran including Lut block and Sistan suture zone from the airborne geomagnetic data together with tilt filter. As the map of obtained lineaments from airborne geomagnetic data has been studied, four distinct set of lineaments has been identified: (i) north–south, (ii) east–we...

At the end of the western part of Bagharan Kuh Mountain in the northeast of Iran, mountain growth has been stopped toward the west because of the stress having been consumed by the thrusting movements and region rising instead of shear movement. Chahkand fault zone is situated at the western part of this mountain; this fault zone includes several t...

Shekarab thrust is located 4 km north of Birjand city. This fault has an east - west trend with 60 degree dip to north. Active shekarab Fault system is seismic source for Birjand city. Because the Shekarab fault is composed of different parts, Streams Fractal dimensions were calculated in eastern and central and western parts. Also, due to the occu...

The Curie point depth map of Eastern Iran was constituted from spectral analysis of the aeromagnetic data. The reduction to pole (RTP) was applied to the magnetic anomaly data. The Curie point depth values from 165 overlapping blocks, 100 × 100 km in size, have been estimated. The Curie point depth method provides a relationship between the 2-D FFT...

The Shekarab Fault system is located at north of Birjand city has fault scarps parallel to main fault. For investigate the direction of migration, four cross-sections perpendicular to the fault has done. In all these sections, by moving from north to south, the older lithological units are trusted over younger ones. Units with low resistance includ...

The Chelounak area in northwest of Birjand located in the Sistan suture zone extremity with middle-upper Eocene sedimentary and pyroclastic rocks, folded with different axes and exposed between the Chahak-mosavieh and Mohammadieh-Hessarsangi faults. These folds have a dominant characteristic of the dispersion axis trends of NE-SW, NW-SE, and N-S. G...

Abstract In this study, the development of structural elements and the relationship between these elements and dikes emplacements investigated by the field surveys and analysis of satellite images of the East Dasht-e Bayaz Fault Zone. In this area NNW-SSE (T2) and NW-SE trending dikes are which follow the fractures of the region. We measured geomet...

ذٌ ٌؼُ ؿىشآة داساي سٚ٘ذ ثبختشي - خبٚسي ثبؿيت 60دسخٝ ؿٕبِی ٚ دس فبكّٝ 4وئّٛتشي اص ؿٕبَ ؿٟش ثيشخٙذ لشاس داسد. ٔحبػجٝ چٟبس ؿبخق سیخت صٔيٗ ػبختی ؿبُٔ ؿبخق طَٛ - ٌشادیبٖ سٚدخب٘ٝ)،(SL ٘ؼجت ػشم دسٜ ثٝ استفبع دسٜ ) (Vfدس آثشاٝٞ ٞب، ٞيپؼٔٛتشي ٘ؼجت استفبع ) ٚ (Erػيٙٛػيتٝ پيـب٘ی وٞٛؼتبٖ )ٔ ،(Smfمبدیش ثبلایی سا ثشاي 404( SLتب 0.47( Er ٚ )1020تبٔ ٚ )0.81مبدیش پ...

The present study is concerned with granitoid body crops out in a metamorphic complex occurring around Zul village of South Khorasan Province, eastern Iran. The complex is composed of migmatite, gneiss, mica schist, garnet schist, some marble and quartzite. Based on mineralogy, modal and geochemical data, Zul granitoid includes granite and granodio...