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

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

2010-02-08

arxiv.org/abs/1002.1587v2

Physics

Geophysics

45 pages, 11 figures

Scientific paper

A simple magma accretion model of the oceanic lithosphere is proposed and its implications for understanding the thermal field of oceanic lithosphere examined. The new model (designated VBA) assumes existence of lateral variations in magma accretion rates and temperatures at the boundary zone between the lithosphere and the asthenosphere. Heat flow and bathymetry variations calculated on the basis of the VBA model provide vastly improved fits to respective observational datasets. The improved fits have been achieved for the entire age range and without the need to invoke the ad-hoc hypothesis of large-scale hydrothermal circulation in stable ocean crust. The results suggest that estimates of global heat loss need to be downsized by at least 25%.

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