Abstract
This paper synthesizes the research findings on the stable isotopes (δ2H and δ18O) of the water molecular, with respect to applications in tracing the natural water cycle. A general purpose diagram of δ2H versus δ18O may serve as a geo-indicator of various circulation processes the water is involved: hydrological, hydro-meteorological and hydro-geochemical. Equations and explanations are provided for a total of 13 lines in the diagram that are illustrated to show the fractionation and changes of stable isotopes when experiencing different processes: GMWL; Moisture recycling line; evaporation line, mixing lines with seawater and andesitic water, exchange lines with H2S, CO2, silicate mineral, hydrocarbon, carbonate and clay minerals. These lines serve as a basis in using water stable isotopes in the hydrological, hydrogeological and paleo-climate research.
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