Abstract

Abstract The northwest region of Iran with latitude of upper 36N on heights of upper 2500 meters had an apprepriate sitiuation for the extraction of Quaternary glacials. Especiaslly in current sitiuation, mostly it is one of the coldest placeses of Iran. It was written lots of papers about mountain glacials with heights of more than 3000 meters, like Sahand and Sabalan, but it was not written much about glacials like Zanjan heights, that its peaks has the heights of less than 3000 meters. The conquest of rather flat plains and lose of high regions of upper snowline, made this place to a spatial sitiuation with less glacial formation. However, the distribution of drifter morains and U shaped valleys in north and south of Zanjanrood, besides the low mean annual tempretures of these regions (Zanjan station 11.4C) was aqonized on the dominance of quaternary glacial processes. So at first the height of permanent snowline in write method was evaluated by the recognition of circs effects in 1:50000 topographic maps. After that the current and past iso therm lines were done by gathering and reformation of statistical data of the region climatic stations. According to the past 5˚C isothermal, the line height of water and ice equilibrium was evaluated (603 meters). The least height of basin in output was about 1103 meters, that expression of getting out of quaternary glacials from Zanjanrood basin and going into Ghezelozan, if that geomorphological evidences was not reflected such situation. Because of this, in a step by step field research, the geomorphologic evidences were evaludted due to the region quaternary glacials. The results showed the water and ice equilibrium line in heights of upper than the heights of 5˚C isothermal and were matched with past 2.16 ˚C line in 1550 meters.