Chemical differentiation of the lower lithosphere as represented by the Ronda ultramafic massif, southern Spain

摘要: Abstract The Ronda ultramafic massif of southern Spain was differentiated into peridotite (95%) with mafic segregations (5%) before it elevated to the crust from a depth 70 km. No igneous textures have survived metamorphism which occurred during rise and emplacement massif, but certain primary features can be identified indicate that process differentiation involved partial fusion followed by segregation modification melts wallrock reactions, crystal fractionation and, possibly, remelting. are now represented layers termed orthomagmatic if they truly represent compositions their parent depleted do not.