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A simple magma accretion model of the oceanic lithosphere is proposed and itsimplications for understanding the thermal field of oceanic lithosphereexamined. The new model (designated VBA) assumes existence of lateralvariations in magma accretion rates and temperatures at the boundary zonebetween the lithosphere and the asthenosphere. Heat flow and bathymetryvariations calculated on the basis of the VBA model provide vastly improvedfits to respective observational datasets. The improved fits have been achievedfor the entire age range and without the need to invoke the ad-hoc hypothesisof large-scale hydrothermal circulation in stable ocean crust. The resultssuggest that estimates of global heat loss need to be downsized by at least25%.

A Magma Accretion Model for the Formation of Oceanic Lithosphere: Implications for Global Heat Loss