Mathematics – Logic
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..401s&link_type=abstract
(Royal Society, Discussion on the Origin and Evolution of the Earth's Continental Crust, London, England, Feb. 21, 22, 1980.) Ro
Mathematics
Logic
21
Astronomical Models, Earth (Planet), Magma, Planetary Composition, Planetary Evolution, Volcanology, Abundance, Convective Flow, Earth Crust, Lunar Evolution, Meteorite Craters, Mineral Deposits, Plates (Tectonics), Temperature Profiles, Thermal Boundary Layer
Scientific paper
It is pointed out that there is no direct geological information on the first 750 Ma of earth history. Consequently the reported study is based on controversial inferences drawn from the moon, other planets and meteorites, coupled with backward extrapolation from surviving terrestrial rocks, especially those of Archaean age. Aspects of accretion are considered, taking into account cosmochemical and cosmophysical evidence, a new earth model, and convection systems. Attention is given to phase-equilibrium constraints, estimates of heat production, the bombardment history of the moon and implications for the earth, and the nature of the early crust. From a combination of physical, chemical, and petrological arguments, it is concluded that the earth's surface underwent intense volcanism in the pre-Archaean era, and that the rock types were chemically similar to those found in the early Archaean era.
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