Groundwater recharge to ophiolite aquifer in North Oman: constrained by stable isotopes and geochemistry

Osman Abdalla, Rashid Al Abri, Khadija Semhi, Talal Al Hosni, Mansour Amerjeed, Ian Clark

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The current study employs geochemical and isotopic tools to understand hydrochemical and recharge processes characterizing ophiolite aquifer in North Oman in conjunction with the Hajar Super Group (HSG) aquifer. A total of 57 samples were analyzed for major ions and stable isotopes 2H and 18O. The geochemical composition of groundwater indicates that water–rock interaction and mixing are the main processes controlling groundwater chemistry. Groundwater in the HSG is characterized by carbonate minerals dissolution contrary to the groundwater in the ophiolites where silicates dissolution dominates. This results in differences in the groundwater chemical composition in the two systems. Isotopic characteristics of precipitation collected during the study period indicate two main moisture sources from the Indian Ocean and the Mediterranean Sea. Groundwater δ2H and δ18O values suggest two recharge sources to the ophiolite aquifer: lateral flow from the HSG and direct infiltration. Recharge from direct infiltration in the highlands, which is depleted in δ2H and δ18O, retains the same isotopic signature of precipitation, whereas that in the low land substantially reflects an evaporation effect.

Original languageEnglish
Article number1117
JournalEnvironmental Earth Sciences
Volume75
Issue number15
DOIs
Publication statusPublished - Aug 1 2016

Keywords

  • Arid areas
  • Groundwater
  • Hydrochemistry
  • Isotopes
  • Oman
  • Recharge

ASJC Scopus subject areas

  • Soil Science
  • Environmental Chemistry
  • Water Science and Technology
  • Pollution
  • Global and Planetary Change
  • Geology
  • Earth-Surface Processes

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