It is an outstanding property of hydrogen and oxygen isotopes in surface fresh waters to be directly climate related. Since actual traces of ancient waters, such as in fluid inclusions, are often lost or difficult to read, the pressure to use substitute information is intense. Dallai et al. (2001) reiterate the fact that in hydrothermal systems, meteoric waters may pull rock minerals into isotopic equilibrium. A mineral may then provide the isotopic composition of precipitation water recharged at the time of activity. Earlier works have covered this field of study, including in the Antarctic, and in order to have equilibrium...

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