Abstract
In a set of thermomineral waters of about constant major-element composition, Al, Fe and rare-earth element (REE) concentrations are strongly dependent on the spring temperature. Al and REE concentrations are not affected by CO 2 degassing at the outflow of the waters. Al concentrations vary by one order of magnitude between the coldest and the hottest waters. This change in total concentration is related to a change in the speciation: fluoride complexes (mainly AlF 0 3) are the dominant species in cold waters; hydroxide or fluoro-hydroxide complexes are more important at higher temperature. REE patterns vary smoothly as a function of the atomic number from a regular decrease for the hottest water ( Ce Yb = 30 ) to a large increase from Ce to Dy, followed by a slight decrease from Dy to Yb for the coldest waters ( Ce Yb ∼ 0.3 ; Ce Dy ∼ 0.15 ).
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