Abstract
RECENTLY, Birch1 reported data on the density and composition of the mantle and core. He wrote: “The resulting densities in the lower mantle are found to be in good agreement with shock-wave measurements on rocks having FeO contents in the range 10 ± 2% by weight … except for iron oxide, the chemical composition of the mantle is indeterminate. The density of the outer core is lower than that of iron by about 10%”.
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References
Birch, F., J. Geophys. Res., 69, 4377 (1964).
Mason, B., Amer. Museum Novitates, 2223, 1 (1965).
Ringwood, A. E., Geochim. Cosmochim. Acta, 15, 195 (1958).
MacDonald, G. J. F., and Knopoff, L., Geophys. J., 1, 284 (1958).
Poldervaart, A., Geol. Soc. Amer. Spec. Paper, 62, 119 (1955).
Green, D. H., and Ringwood, A. E., J. Geophys. Res., 68, 937 (1963).
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MASON, B. Composition of the Earth. Nature 211, 616–618 (1966). https://doi.org/10.1038/211616a0
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DOI: https://doi.org/10.1038/211616a0
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