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These study includes geochemical and geothermal aspects for all the thermomineral waters in French Alp Massif, Rhone-Alpes and Provence-Cote d'Azur districts. It has been possible to recognize five thermomineral water groups. Stable isotopic compositions (oxygen-18 and deuterium) indicate that all waters have same the meteoric origin. Dissolved species compositions originate essentially from fluids and sedimentary layers interactions while waters are going up to the surface. So it is always difficult to know the initial deep water composition. An important unsolved question is the origin of chloride and sodium ions concentrations which are sometimes high. Ignorance of sodium ions origin is a strict handicap to the use of cationic geothermometers (Na-K, Na-K-Ca and Na-Li), and mixed waters on surface do not permit the direct use of silica geothermometers (Quartz or Chalcedony). There are no indications for the existence of very hot deep waters and we have to assume that deep water temperatures are not high (100 degrees C). However, we have no decisive arguments to give accurate values for these temperatures. To improve the knowledge of sedimentary systems, it is necessary to study simpler systems whose geology is known, such as the Bassin de Paris or Bassin Aquitain in France.

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Bibliographic Reference: EUR 9785 FR (1985) MF, 37 P., BFR 150, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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