List of Articles thrust fault

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  1 - 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
  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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  2 - Balanced Cross Sections and Determine of Shortening in North Makran Ophiolite Mélange, Southeastern Iran
  Azizollah Tajvar Mohammad Mahdi Khatib Mohamad Hossian Zarinkoub
  The geometrical and kinematic characteristics of structural elements of north Makran have been measured and analyzed in five structural sections. Then, by using of balance cross sections and restoring the structures to their original state, the amount of shortening has More

  The geometrical and kinematic characteristics of structural elements of north Makran have been measured and analyzed in five structural sections. Then, by using of balance cross sections and restoring the structures to their original state, the amount of shortening has been determined in different parts of the area. The Bashagard, Dranar, Abenma, Koh Bahark and Vernach thrust faults with a WNW-ESE trend and 20 to 35 degrees dip towards the NNE are the main deformation controllers in this region and are the main cause of shortening. The excellent fit between N209/09 principal stress axis calculated based on the geometry of thrust faults and compression axis that formed folds, indicates that these structures were formed as a result of the same tectonic regime. The difference in the amount of shortening in different parts of the north Makran ophiolite mélange of is also directly related to the thrust faults. So that, in western part of north Makran, thrust faults caused shortening amount 22.66, 22.85 and 14.32% in structural sections A-A', B-B' and C-C' respectively,. In the eastern parts, due to the lack of thrust faults and the presence of more strike-slip faults, the amount of shortening has decreased to 4.52% and 6.67%, respectively, in the sections D-D' and E-E'. Balanced cross sections and restoring the structures to the pre-deformation stages represent the narrow width of the early oceanic basin in the north of Makran. Manuscript profile