The papers in this volume derive from a meeting in Leicester in January 1987, and concentrate on magmatic and mantle processes. They include: Asthenospheric control on magmatism in the ocean basins; Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism; Pressure of origin of primary mid-ocean ridge basalts; Genesis of mid-ocean ridge basalts; Origin of hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores; Geochemical features of intraplate oceanic plateau basalts; Characterization of the St Helena magma source; Evaluation of rare gas data in relation to oceanic magmas; and others.
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