The use of stable isotopes (18O, 2H) and hydrochemistry to determine the type and origin of water for Euphrates Aquifer in Alkhasfa Area –Western of Iraq

Abstract

Alkhasfa area is located in Al-Anbar Governorate - Western of Iraq. Isotopes and Hydrochemical analysis in groundwater were attempted the study area to learn more about water quality conditions and geochemical evolution. Groundwater in study area is dominated by (Ca+2 and SO4 −2) ions refers to the effect of gypsum that exists in the Fatha Formation and limestone in Euphrates Formation. The type of water according to Piper classification is alkaline water with an increase in alkalinity due to the prevailing of chloride and sulphate ions. Through the relationship between δ 2H and δ 18O, Three group may be distinguished, the first group include the well (W8), the water representing the mixing between groundwater and surface water (Haditha Lake), the second group includes the well (W1) the water representing the more enriched in δ18O, δ2H isotopic values indicate deep water impacts due to the location of the well above a Fault and the third group includes the remaining wells which have more depleted in heavy stable (δ18O, δ2H) values indicates that rainfall recharged to groundwater in these well. All groundwater samples are located right the Local meteoric line and global meteoric waterline. This means that water undergoes evaporates.