Abstract
The conceptual foundations of the Earth’s geophysical structure and dynamics rest on a variety of surface observables (heat flow, electromagnetic currents, Earth and meteorite samples, etc.), and of interior probes (volcanic fallout, seismic sounding of gross structure, magnetism, etc.) [1]. A basic factor in the interior dynamics and the evolution of the present Earth is the radiogenic heat, ,90% of which comes from the decay of 238 U and 232 Th. With a U abundance and U to Th ratio evaluated for the solar system [2], the present Earth’s radiogenic heat is set at ,16 TW, ,40% of the observed ,40 TW outflow on the Earth’s surface. Models of the Earth [3] disperse ,50% of the total U,Th in the mantle (,2900 km thick) and concentrate the other ,50% in a thin, ,35 km crust under the continents. The oceanic crust is much thinner s,6.5 kmd with a much smaller s3 1
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