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From a study of trace elements, including first transition series elements and low parition coefficient elements or so-called hygromagmatophyle elements (Treuil and Varet, 1973 ; Treuil and Joron, 1976), we will try to establish the three fundamental parameters (mantle material, partial melting, and crystallization) which influence the formation of basalts recovered during Leg 46. Data are presented in connection with shipboard study ; a tentative interpretation is given taking into account our present knowledge of the behavior of trace elements during magmatic processes and comparing the results of FAMOUS, Leg 37 and Leg 45. We ask the reader to look at our Leg 45 report (Bougault. et al., 1978) to gain information about analytical procedures and geochemical methods of investigation. [NOT CONTROLLED OCR]

Trace Elements: Fractional Crystallization and Partial Melting Processes, Heterogeneity of Upper Mantle Material