Manouchehr Ghoreshi Articles List

List of Articles Manouchehr Ghoreshi

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1 - Mechanism of young deformation in Tehran plain: a combination of field observation and analog modeling
Hourieh AliBeygi Morteza Talebian Manouchehr Ghoreshi

The capital city of Tehran is located to the south of central Alborz. The North Tehran fault, as the main structure of this region, perched on the northern part of the city and separate alluvial fans from volcanic rocks of the Alborz. There are several other faults w More

The capital city of Tehran is located to the south of central Alborz. The North Tehran fault, as the main structure of this region, perched on the northern part of the city and separate alluvial fans from volcanic rocks of the Alborz. There are several other faults within the city which seem to be structurally related to the North Tehran fault. Geomorphic study of fans and river deposits suggest that most of these faults are active and taking up both left-lateral and shortening in a wider zone to the south of North Tehran fault. In addition to faults there is distinct folding within the Tehran plain. Field observation along road cuts which cross these structures suggest that young folding in Tehran plain are active and escalate due to the activities of the underlying faults. There is little evidence of rupture in front of these structures and thus most of them are considered as blind faulting. The trend of these structures is oblique to the North Tehran fault which is probably due to distribution of left lateral deformation in wider zone within the Tehran plain. The distance between active folds and the North Tehran fault increase from west to east. Analog modelings were carried out to study the effect of thickness and slop of deposits on position and trend of structures within the Tehran plain. Results from these experiences show that geometry, orientation and distance between structures is probably controlled by oblique shortening of the zone, as well as increase in thickness and slope of the sedimentary deposits. Manuscript profile
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2 - Tectonic geomorphology of Karkheh River Basin (West Iran)
Negin Rahimi Mehran Aryan Manouchehr Ghoreshi

Geomorphic indices are major tools to recognize tectonics activities. These indices have the advantage of being calculated from Arc GIS package over large areas as reconnaissance tool to identify possible geomorphic anomalies related to active tectonics. In this resea More

Geomorphic indices are major tools to recognize tectonics activities. These indices have the advantage of being calculated from Arc GIS package over large areas as reconnaissance tool to identify possible geomorphic anomalies related to active tectonics. In this research, Karkheh river basin was selected and six geomorphologic indices; drainage basin asymmetry (Af), stream-gradient index (SL), drainage basin shape index (Bs), mountain-front sinuosity index (Smf), valley floor width-height ratio (Vf) and hypsometric integral (Himatter) were calculated. Then, the values were classified in three groups and analyzed. The area of the three class as follows: Class2) 12180 km2, 23.7% Class3) 32318km2, 62.9% Class4) 6843km2, 13.3% The region has an area of about 51341 km2, so this result presents the moderate relative activity in the extensive parts of the area. Manuscript profile
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3 - Estimating the rate of shortening and the role of decollement in western Kopet-Dagh deformation
Moayyed zahra Tashakkory Hossenzadeh Manouchehr Ghoreshi Asadolah Bayrami. J. A Mohsen Pourkermani

The kopet- Dagh zone undergone subsidence and deposition of sediments after middle Cimmerian orogeny in middle Jurassic to Eocene. Its shortening resulted from the Zagros orogeny in Paleogene. In order to identify the minerals at the detachments, XRD analysis was carrie More

The kopet- Dagh zone undergone subsidence and deposition of sediments after middle Cimmerian orogeny in middle Jurassic to Eocene. Its shortening resulted from the Zagros orogeny in Paleogene. In order to identify the minerals at the detachments, XRD analysis was carried on the samples of Shemshak and Chamanbid Formations. On the other hand, the estimated shortening in the west and central Kopet-Dagh in two north-south cross-sections, were calculated in the 3D software of Move-Midland Valley, using previous data, field observation, geological maps and satellite images. The study of the three-dimensional cross sections, which is considered to be the innovations of this research, in the Move software has shown that most of the anticlines of the region are asymmetric due to the operation of detachment horizons. The results of the analyses indicate that the Shamshak Formation has more potential for developing detachment surfaces than the Chamanbide Formation. The reason for this detachment surface is due to thickness and mineralogy of the Shemshak Formation. On the other hand, by using geometric relationships, the depth of detachments was calculated for the main folds. In most of the detachments, this depth was calculated at lower levels of the Shemshak Formation. Manuscript profile
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4 - Investigation of structural pattern and introduction of detachment surface of Alborz Mountain Range in the north of Damghan
Z. Taslimi A. Saidi M. Ghoreshi M. Aryan A. Solgi
20.1001.1.17357128.1401.16.61.6.3

The studied area is a part of Eastern central Alborz, bestween southeastern piedmont of Alborz (NW of Damghan) and North Alborz Fault (South of Sari). The Alborz Mountain range which forms the heights of northern territory, separated the Caspian Depression from Iran cen More

The studied area is a part of Eastern central Alborz, bestween southeastern piedmont of Alborz (NW of Damghan) and North Alborz Fault (South of Sari). The Alborz Mountain range which forms the heights of northern territory, separated the Caspian Depression from Iran central plateau. The Alborz is one of the Iranian mountain ranges that were deformed during two Cimmerian and Alpine organic events. This deformation is continued until the present day. This research is based on the satellite images, field investigations, drawing structural sections, stratigraphic sequences from the folded and thrusted parts of Alborz Mountains. The studied area is composed of numerous anticlines and synclines from South to North as Tuyeh- Darvar anticline, Sabour anticline, Talma- Darreh anticline, Alikhani syncline, Tarkan anticline, Babr cheshmeh syncline and anticline. Some of these folds are related to faulting which occured due to the typical continuous shortening and faulting of Alborz crust and destroyed their original patterns. The function of main faults and specially thrust faults played an essential role on the present models of mentioned folds. Regarding the axes of the folds, the effective compression over the area has a North, North Waste-South, South-East direction. This direction is perpendicular to axial trend of folds. The physico-mechanical properties of Alborz geological units caused development of detachment surfaces on main faults. The shortening intensity and large displacements have led to disappearance of a limb or whole fold. In this study the three surfaces of detachment were introduced inside the stratigraphic sequences from Precambrian to middle Eocene based on the well-known and documented data. Manuscript profile

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List of Articles Manouchehr Ghoreshi