Mathematics – Logic
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975toasc.109..109f&link_type=abstract
Torino, Accademia delle Scienze, Classe di Scienze Fisiche, Matematiche e Naturali, Atti, vol. 109, Jan.-Apr. 1975, p. 109-117.
Mathematics
Logic
Abundance, Chondrites, Earth Planetary Structure, Potassium 40, Thermal Emission, Thorium Isotopes, Uranium Isotopes, Earth Crust, Earth Mantle, Geochronology, Radioactive Decay, Rocks, Tables (Data), Uranium 235, Uranium 238
Scientific paper
Data on the principal types of terrestrial rocks are examined for content of long-lived uranium, thorium, and potassium isotopes, relative decay heat, and K/U and Th/U ratios, for comparison with data on chondritic meteorites. The comparisons afford a test of the hypothesis of a mantle of chondritic composition in the study of the earth's thermal evolution. Marked discrepancies in K content are found between chondritic meteorites and basic or ultrabasic terrestrial rocks. While as much as 80 per cent of the heat presently produced in terrestrial rocks is accounted for by U-238 and Th-232, with K-40 accounting for 6 per cent, K-40 accounts for 56 per cent of the heat produced in chondritic meteoritic material (with 78 per cent calculated for geologic time).
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