شواهد ژيومرفولوژيك فرسايش يخچالي پليستوسن در ارتفاعات تالش

Geomorphologic Evidence of the Pleistocene Glacier Erosion in the Talesh Highlands

The Talesh mountains consist of a variaty forms resulted form glacier erosion. The action of dynamic morphogenesis depends on the climatic conditions, but the present climatic conditions do not allow these forms to be built, therefore, the existence of such forms is emphasizing a change in climatic situations and, as a result, a change in morphogenesis system in this part of our country. Due to the immunity of these forms to erosion, the time of their formation dates back to the global Pleistocene climatic changes. Recognition of these forms happened though aerial photograph the area cover topographic maps and area observation. Recognizing the source of sediments was done through their sampling and analysis. The geomorphologic investigated evidence in this research consist of Cirques, glacial valleys, erratic block, moraines, and the ice-eroded surface. The average snow-line resulted form this research for the Talesh Mountains was calculated to be 2360 meters but due to their neighbouring with Caspian sea, some location-related factors have caused some variations in the altitude of snow-line in a way that the snow-line altitude in the east side was calculated to be 1800 meters, south side to be 2400 meters and west side to be 2900 meters. The morphogenesis of the Talesh Moimtions was done through two systems of glacier and sub-glacier erosion during the cold periods of Pleistocene.