Abstract
Thermomagnetic and microprobe studies of native iron in the terrestrial upper-mantle hyperbasites (xenoliths in basalts), Siberian traps, and oceanic basalts are carried out. The results are compared to the previous data on native iron in sediments and meteorites. It is established that in terms of the composition and grain size and shape, the particles of native iron in the terrestrial rocks are close to each other and to the extraterrestrial iron particles from sediments and meteorites. This suggests that the sources of the origin of these particles were similar; i.e., the formation conditions in the Earth were close to the conditions in the meteorites’ parent bodies. This similarity is likely to be due to the homogeneity of the gas and dust cloud at the early stage of the solar system. The predominance of pure native iron in the sediments can probably be accounted for by the fact that interstellar dust is mostly contributed by the upper-mantle material of the planets, whereas the lower-mantle and core material falls on the Earth mainly in the form of meteorites. A model describing the structure of the planets in the solar system from the standpoint of the distribution of native iron and FeNi alloys is proposed.
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Original Russian Text © D.M. Pechersky, D.M. Kuzina, G.P. Markov, V.A. Tsel’movich, 2017, published in Fizika Zemli, 2017, No. 5, pp. 44–62.
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Pechersky, D.M., Kuzina, D.M., Markov, G.P. et al. Native iron in the Earth and space. Izv., Phys. Solid Earth 53, 658–676 (2017). https://doi.org/10.1134/S1069351317030089
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DOI: https://doi.org/10.1134/S1069351317030089