By Professor Dr. Minoru Ozima (auth.)

Discusses the worldwide evolution of the earth, corresponding to middle- mantle separation, mantle-crust evolution, foundation of ocean- surroundings procedure, at the foundation of isotope earth technology and paleomagnetism, the place contemporary devlopment in planetology and astrophysical theories are widely taken into account.

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Extra info for Geohistory: Global Evolution of the Earth

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Direct proof of the simultaneous formation of the earth and meteorites can be found in the radiogenic 129Xe (here referred to as 129Xe*) first detected in the Richardton chondrite. H. Reynolds in 1960. 1291 has a half-life of 17 million years, and decays Moon, Meteorites, and Other Planets 47 into 129Xe*. The formation of 1291 within the solar system after the creation of the solar system can be ignored. We can consider all 1291 as having been formed in the nucleosynthesis that created the elements of the solar nebula.

The existence of the magnetic field backs up this likelihood. However, no moment of inertia data that actually prove the existence of a metallic core have been obtained. As is obvious from the example above, comparative studies of the planets not only deepen our understanding of each planet, but also play a major role in contributing to our understanding of the fundamental physical and chemical processes - in the above example, the electromagnetic fluid theory related to the origin of magnetic fields - that regulate the origin and evolutionary processes of the planets.

On Mercury, however, which is regarded as quite different from other terrestrial planets as far as its average density and, naturally, its chemical composition are concerned, a considerable magnetic field has been observed. These differences in the magnetic fields reflect the different origin and evolutionary process of each planet. Conversely, then, it is possible to place constraints on the origin and evolution of each planet from the viewpoint of the origin of its magnetic field. The magnetic fields of planets are generally understood to be the result of an electric current produced when an electrically conductive fluid moves within the magnetic field - we can assume that there existed initially a weak "seed" as the magnetic field with this current creating a permanent magnetic field (Faraday's Law).

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