Writers : Mohammadzadeh, Hossein
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

For regional and local isotopic investigations, it is important to compare isotopic data of surface water and groundwater with the local meteoric relationship for 18O and 2Η in precipitations. In this paper, the Mashhad meteoric water line (MMWL) is defined for the first time, based on samples of precipitation collected from several rain stations located within and around of Mashhad city - NE of Iran. Both the slope and δ2H intercept for MMWL (δ2H = 7.17 δ18O + 11.22) are deviated from the global meteoric water line - GMWL (δ2H = 8.13 δ18O + 10.8). The huge variation in isotopic compositions of the Mashhad rain (from -198.2 to +38.1‰ and from -26.1 to +3.7‰ for δ2H and δ18O, respectively) is because of strong seasonal changes in precipitations in this area. The 2H and 18O isotopes of local water resources show evaporative enrichment in comparison with local meteoric water.

Subject List : Isotopic study