Abstract
Until recently the REE were considered to be immobile in the hydrosphere. However, studies of hydrothermal fluids from mid-ocean ridges and subaerial hydrothermal systems has shown that the REE are mobilised during water-reck interactions. In submarine hydrothermal systems, where the host rocks are basaltic and therefore containing relatively low REE concentrations, appreciable concentrations of the REE are observed in the fluids, (Michard 1989). The REE have also been studied in subaerial hydrothermal systems. Only where either the pH is low or the host rock is highly evolved, are there significant concentrations of the REE, (Michard 1989). In Icelandic geothermal systems, where the rocks are typically tholeitic in composition, and the the geothermal waters are neutral to alkaline, the REE have been investigated in order to understand their mobility in this geochemically very different environment. Method
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