Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..243r&link_type=abstract
Icarus, vol. 30, Feb. 1977, p. 243-253. Research supported by the Australian-American Educational Foundation;
Astronomy and Astrophysics
Astronomy
11
Chemical Fractionation, Earth (Planet), Planetary Composition, Venus (Planet), Abundance, Astronomical Models, Carbon Dioxide, Geochemistry, Oxidation, Potassium
Scientific paper
Two hypotheses attempting to account for the anomalously low intrinsic density of Venus in terms of chemical fractionation processes are entertained. Both assume similar relative abundances of major elements (Fe, Si, Mg, Al, Ca) in Venus and earth. One model assigns a larger proportion of the total Fe present in Venus to the planetary mantle, implying a core/mantle ratio lower than that of earth, and more extensive oxidation. The alternate hypothesis projects a Venus more reduced than the earth, with a mantle devoid of oxidized Fe; the difference in intrinsic densities is then attributed to the earth accreting at a lower temperature consonant with its greater distance from the sun. Large amounts of sulfur are presumed accreted on the earth but not on Venus, in the second model. Available chemical evidence tends to favor the first model.
Anderson David L.
Ringwood A. E.
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