Acquisition des ions alcalino-terreux par les eaux thermales carbogazeuses

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Nous présentons différents arguments tendant à montrer qu'une proportion importante des éléments alcalinoterreux présents dans les sources thermominérales du Massif Central français est acquise en subsurface lors de la remontée de l'eau. Au cours de ces réactions subsuperficielles, le rapport Na/K est peu modifié. Les hautes teneurs en Ca2+ et Mg2+ de ces eaux ne constituent pas un argument suffisant pour rejeter l'information fournie par le géothermomètre Na/K. Nous montrons également que l'utilisation des rapports isotopiques du strontium comme indicateur d'origine doit être menée avec précautions. We develop here some arguments leading to show that an important part of dissolved alkaline earth ions observed in Massif Central hot springs results from subsuperficial rocks dissolution. This subsuperficial water-rock interaction does not change significantly the Na/K ratio. Thus, the high amounts of dissolved Ca and Mg do not prove definitely that the Na/K geothermometer must be rejected. We show that much care must be taken when using the Sr isotopic ratio as a tracer of the origin of this element.

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