More than 250 magnetic spherules 40–200 µm in size were mechanically separated from a ferromanganese crust sample of Fedorov Guyot in the Magellan Seamounts. The composition of the spherules corresponds to stony-iron and iron (with a nickel admixture) meteorites oxidized to varying degrees. The surface morphology and the internal texture of these spherules are similar to modern micrometeorites. Some spherules have a zonal structure with a core consisting of unoxidized nickel iron, with a nickel content of 7.5%–53% and a cobalt admixture up to 3.7%. Microinclusions (up to 0.5 μm) of rhodium platinum were found for the first time in a spherule consisting of wüstite and magnetite in the ferromanganese crust. The presence of cosmogenic spherules in the sample studied indicates the accumulation of a certain fraction of platinoids in the ferromanganese crusts due to the burial of cosmic dust in them.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
J. R. Hein, K. Mizell, A. Koschinsky, and T. A. Conrad, Ore Geol. Rev. 51, 1–14, (2013).
G. N. Baturin, E. V. Konopleva, V. T. Dubinchuk, and M. E. Mel’nikov, Oceanology 45 (2), 269–276 (2005).
P. Halbach, C. Kriete, В. Prause, and D. Puteanus, Chem. Geol. 76, 95–106 (1989).
M. P. Torokhov and M. E. Mel'nikov, Dokl. Earth Sci. 405A (9), 1288–1290 (2005).
R. B. Finkelman, Science 167, 982–984 (1970).
M. E. Melnikov and S. P. Pletnev, Lithol. Miner. Res. 48 (1), 1–13 (2013).
D. E. Brownlee, D. A. Bates, and M. M. Wheelock, Nature 303, 693–695 (1984).
M. Van Ginneken, M. J. Genge, L. Folco, and R. P. Harvey, Geochim. Cosmochim. Acta 179, 1–31 (2016).
M. J. Genge, C. Engrand, M. Gounelle, and S. Taylor, Meteorit. Planet. Sci. 43, 497–515 (2008).
N. G. Rudraswami, K. P arashar, and M. Shyam Prasad, Meteorit. Planet. Sci. 46, 470–491 (2011).
N. S. Rudashevskii, Yu. L. Kretser, and L. I. Anikeeva, Dokl. Earth Sci. 378 (4), 464–467 (2001).
A. A. Marakushev, L. B. Granovsky, N. G. Zinovieva, et al., Cosmic Petrology (Moscow, Nauka Press, 2003) [in Russian].
We are grateful to T.E. Puzankova for providing us for this study with a Fe–Mn crust sample from the collection of the Chair of Geography, Geology, and Geophysics, Bering Kamchatka State University.
This work was supported by the Russian Science Foundation, project no. 18–17–00015.
Translated by L. Mukhortova
About this article
Cite this article
Savelyev, D.P., Khanchuk, A.I., Savelyeva, O.L. et al. First Find of Platinum in Cosmogenic Spherules of Ferromanganese Crusts (Fedorov Guyot, Magellan Seamounts, Pacific Ocean). Dokl. Earth Sc. 491, 199–203 (2020). https://doi.org/10.1134/S1028334X20040157
- ferromanganese crusts
- micrometeorite spherules
- Fedorov Guyot
- Magellan Seamounts