Abstract
IN a recent communication, Pettersson1 estimated the rate of accumulation of nickel on the Earth from extra-terrestrial sources on the basis of the nickel-bearing particles caught on niters located on the summits of two Hawaiian volcanoes. His value for the rate of accumulation of extra-terrestrial nickel is 6.5 × 1011 gm./yr. for the Earth as a whole. If the rate of accumulation is reasonably constant over the Earth's surface, then this figure corresponds to 33 × 10−6 gm. nickel/cm.2 of the Earth's surface/1,000 yr.
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References
Pettersson, H., Nature, 181, 330 (1958).
Broecker, W. S., Turekian, K. K., and Heezen, B. C., Amer. J. Sci., 256, 503 (1958).
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TUREKIAN, K. Rate of Accumulation of Nickel in Atlantic Equatorial Deep-Sea Sediments and its Bearing on Possible Extra-Terrestrial Sources. Nature 182, 1728–1729 (1958). https://doi.org/10.1038/1821728b0
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DOI: https://doi.org/10.1038/1821728b0
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