Géochimie comparée des éléments hygromagmaphiles dans le système exogène océanique

The present study deals with the geochemistry of Y, Zr, Nb, the rare earths (REE), Hf, Ta and Th in the oceanie environment. These are the so-called "hygromagmaphile" elements, which are characterized by a coherent behaviour in basaltie systems. The results indieate that substantial fractionations occur between these elements during Earth surface processes, from their removal from source rocks to their incorporation into deep-sea sediments.