Geodynamics Research International Bulletin

6

Authors: Mandana Zahrkesh, Hossein Morovati, Mohsen Pour Kermani

The Geodynamic developments in the natural coast of the region disrupt the natural, balanced and stable trend of coastal reciprocal behavior which leads to reactions such as sedimentation and local erosion depending on new conditions. These changes will have an adverse effect on the performance of the instrument and the created structures. In other words, the structural characteristics of coastal and marine shoreline in the area have a mutual influence on each other.Geodynamic developments in the natural coast of the region disrupt the natural, balanced and stable trend of coastal reciprocal behavior which leads to reactions such as sedimentation and local erosion depending on new conditions. These changes will have an adverse effect on the performance of the instrument and the created structures. In other words, the structural characteristics of coastal and marine shoreline in the area have a mutual influence on each other. Therefore, the studies on implementation or expansion of coastal and marine structures should investigate the effects on the coastal regions under study. In this research, the total sediment transport rate from different directions was calculated by comparing the Bijker’s (1971) formula, the Van Rijn’s formula and the CERC formula as well as sediment transport rate considering the prevailing characteristics of sea waves, sea currents, fluctuation of Caspian Sea levels, and sediment grading curve. Then, the total sediment transport rate was analyzed using the Wet Lay-up statistical technique (Benny Byat and Patrick,2013).

10

Authors: Seyed Ahmad Babzadeh

The Sistan suture zone (Eastern Iran) belongs to the Tethian suture, which was formed during the Early Cretaceous to Paleogene. This suture zone is divided into two tectono-sedimentary provinces (Gazik and Sahlabad) that reflect different paleo-geographic domains. The zone was created as a marginal basin, which opened prior to the Early Aptian between the Lut block and Afghan margin as a consequence of northeastward subduction of the Neo-Tethys Ocean. The active margin accretionary facies accumulated in the eastern region of this suture (Gazik Province) during the Late Cretaceous (pre-Maastrichtian), whereas passive margin facies and deep basin facies were deposited in western region (Sahlabad Province) at this time. This narrow oceanic domain was closed in three steps with an east to west progradation, in the Maastrichtian to Late Eocene. This interpretation results from new microbio-stratigraphic data from the accretionary facies and Ophiolitic mélanges emplaced in this narrow mobile belt.

13

Authors: Mohammad Khalaj, Mohsen Pourkermani, Mehran Arian

Morphometric parameters are as a method for determining the speed of active tectonic processes. Since then the active regions were identified by qualitative analysis, the speed of these processes find applications to earthquake hazard assessment. The purpose of this article is measuring of morphometric parameters in south central Alborz range, to determine the rate of active tectonics. Therefore, the quantitative morphometric parameters were measured and evaluated for the mountains of north Tehran, Karaj, Anti-Alborz. The results show that the East of the South Central Alborz range is more active than its West. Tectonics activity, away from the side of Alborz mountain range to central Iran also will be decreased