First Find of Platinum in Cosmogenic Spherules of Ferromanganese Crusts (Fedorov Guyot, Magellan Seamounts, Pacific Ocean)

Abstract

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.

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ACKNOWLEDGMENTS

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.

Funding

This work was supported by the Russian Science Foundation, project no. 18–17–00015.

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Correspondence to D. P. Savelyev.

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Translated by L. Mukhortova

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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

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Keywords:

  • ferromanganese crusts
  • micrometeorite spherules
  • platinum
  • Fedorov Guyot
  • Magellan Seamounts