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Title:
Chemical Composition of Earth, Venus, and Mercury
Authors:
Morgan, John W.; Anders, Edward
Publication:
Proceedings of the National Academy of Sciences of the United States of America, Volume 77, Issue 12, pp. 6973-6977
Publication Date:
12/1980
Origin:
JSTOR
DOI:
10.1073/pnas.77.12.6973
Bibliographic Code:
1980PNAS...77.6973M

Abstract

Model compositions of Earth, Venus, and Mercury are calculated from the premise that planets and chondrites underwent four identical fractionation processes in the solar nebula. Because elements of similar properties stay together in these processes, five constraints suffice to define the composition of a planet: mass of the core, abundance of U, and the ratios K/U, Tl/U, and FeO/(FeO + MgO). Complete abundance tables, and normative mineralogies, are given for all three planets. Review of available data shows only a few gross trends for the inner planets: FeO decreases with heliocentric distance, whereas volatiles are depleted and refractories are enriched in the smaller planets.
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