Abstract

Four layers, a dust layer, an anorthosite layer, a basalt layer and a dunite layer, have been used to model the surface of the Moon 4·6 billion years ago. The equations describing heat conduction with or without radioactive heating have been written and Laplace transform techniques have been applied. The thermal history of the imbedded basalt-like material has been found by numerical inversion of the Laplace transform. The objective of the present analysis is to determine whether the solidification of the basalt could be delayed about 1 billion years to produce the observed age difference between the dust and the crystalline rocks found on the surface of the Moon.

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