Comparative planetology and the early history of the earth

Details Comparative planetology and the early history of the earth Comparative planetology and the early history of the earth

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981geokh.....1603b&link_type=abstract

(Akademiia Nauk SSSR, Vsesoiuznyi Simpozium po Stabil'nym Izotopam v Geokhimii, 8th, Moscow, USSR, Nov. 11-14, 1980.) Geokhimiia

Computer Science

Earth (Planet), Planetary Evolution, Planetology, Terrestrial Planets, Earth Crust, Lunar Composition, Planetary Composition, Planetary Nebulae, Planetary Structure, Venus (Planet)

Scientific paper

It is suggested that the original parameters used to calculate nebula condensation be reviewed, and that new models for the condensation of heterogeneous primary clouds at various distances from the sun be developed, particularly for zones of formation of the terrestrial planets. A concept of heterogeneous accretion of planets is presented, whereby the replacement sequence of accreted material is responsible for the thermal sequence of nebular phase condensation, and where the proportion of high temperature and low temperature phases taking part in planet formation decreases with increased distance from the sun. The impact-explosive phenomenon is described, beginning from the time of accretion planetary formation up to the appearance of a planetary surface zone resulting from impact fusion. Shock-metamorphism processes at the final stages of accretion of large planets is discussed, where the primary continental crust of the lunar type is buried in the deep mantel. Comparative-planetology shows that there is no great difference in the structure of the crust of continental and sea types on any one planet of the terrestrial group. It is concluded, therefore, that either it is an error to distinguish between two types of crust on the earth, or that the two-crust phenomenon is a specific property of the earth.

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