QUATERNARY JOURNAL OF IRAN
Year:2015 | Volume:1 | Issue:2|Papers Count:8

Extended Abstract:Introduction: In desert areas high temperature and low precipitation limit growth and development of plants. Under this circumstances wind becomes the most important erosion and transportation factor in these areas. There are four great sand masses in the central part of Dasht-e-Kavir namely Rig-e-Jen, Rig-e-Sargardan (Shotori or Halvan), Rig-e-Kharturan, and Rig-e- Chah-e-Jam. These great sandy masses show an especial pattern, so that all of them are located almost on an irregular circle around Dasht-e-Kavir. Their circular alignment can be resembled to a circulation around Dasht-e-Kavir. So far, the placement of these sandy masses was interpreted under the influence of topography and stoss-side of current features around Dasht-e-Kavir. However, the elongation and combination of these sandy masses don't show a good correlation with their relative location.

Extended Abstract:Introduction: Characteristics of the natural environment are the most important factor for the formation of human settlements, especially in the ancient eras. Geoarchaeological surveys are the efficient way to discover the environmental features of ancient settlements at the time of their establishment. Geoarchaeology is the application of geological and geomorphological techniques to archaeology and the study of the interactions of hominines with the natural environment at a variety of temporal and spatial scales (Brown, 2008: 278). Micromorphology is one of the appropriate techniques used in this field. Chaltasian ancient enclosure is a prehistoric settlement located on the central parts of Jajrour fan and the aim of this study is the geoarchaeological survey of the Chaltasian prehistoric enclosure in Varamin Plain, using micromorphological techniques.

Extended Abstract: Introduction: The Sabalan volcano is one of the youngest volcanic calderas in east of Turkish-Iranian Plateau and is a young member of the Alborz Magmatic Arc (AMA). This stratovolcano is located in northwest of Iran and northern of Bitlis- Zagros Suture Zone. Turkish-Iranian Plateau covers an area about 1.5-2 million km2, and it is marked by high elevations (typically 1.5-2 km above sea level) and low relief compared with mountains ranges to the south and north, where convergent deformation is more active (e.g. Zagros, Alborz, Kopeh Dagh and Greater Caucasus ranges). Magmatism is an important feature on the Turkish–Iranian high plateau in the Arabia-Eurasia collision zone.

Extended Abstract: Introduction: Geological time has been evaporited sediments form by solar-driven concentration of a surface or nearsurface brine. Large, thick and extensive deposits were dominated by rock-salt (mega-halite) or anhydrite (mega-sulfate) deposits tend to be marine evaporites and can be associated with extensive deposits of potash salts (mega-potash). Examinations of sedimentologic and mineralogic characteristics of the closed-basin cores due to the very high susceptibility to precipitation and evaporation balance are beneficial for determination and evolution of late Quaternary sedimentary specification. Playa defined as an intra-continental arid zone basin with a negative water balance for over half of each year, dry for over 75% of the time, with a capillary fringe close enough to the surface such that evaporation will cause water to discharge, usually resulting in evaporites.

Extended Abstract:Introduction: Coccolithophores are unicellular marine phytoplankton characterized by calcareous scales called coccoliths. Cocclithophores appeared in the fossil record during Late Triassic. They live at different depths in the photic zone owing to their requirement of sunlight for photosynthesis. Their distribution in the upper water column is influenced by surface oceanic circulation and different parameters such as temperature, salinity (Winter et al., 1994).

Extended Abstract:Introduction: In the recent decades, with increasing in human need to produce more food and their encountering with high risk geological phenomena like earthquake and bioenvironmental pollutions, the importance of the quaternary system and realizing its different aspects for geologists were increased. This research considers the scientific phenomena occurred in Hashtgerd area. It is located between 35o52′30″N and 36o00′00″N latitudes and 50o37′30″ E and 50o45′00″E longitudes.

Extended Abstract:Introduction: The Earth's current surface forms and phenomena are the result of climatic processes of last periods. These processes, because of climatic variations of regions, had different effect on the earth surface. The origins of the modern forms of earth related to transformations of two million years ago that scientists have called it the Quaternary period. Study of glacial erosion system is noteworthy for two views: first, there are still frozen areas in our time; Second, because during the Quaternary glacial, glacier surface was extended to today, therefore were involved in the formation of large areas that have already been released from the glacier. The case study is Gorganrood basin.