TY - SER AU - Bougault,H AU - Cambon,P AU - Corre,O AU - Joron,J.L AU - Treuil,M ED - Symposium: Processes at Mid-Ocean Ridges TI - Evidence for variability of magmatic processes and upper mantle heterogeneity in the axial region of the Mid-Atlantic Ridge near 22° and 36° N SN - 00401951 N1 - ; bibliogr. p. 33-34 ER -