First Find of Platinum in Cosmogenic Spherules of Ferromanganese Crusts (Fedorov Guyot, Magellan Seamounts, Pacific Ocean)
| Autor: | P. E. Mikhailik, O. L. Savelyeva, A. I. Khanchuk, D. P. Savelyev, S. V. Moskaleva |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Seamount Geochemistry chemistry.chemical_element Crust Guyot engineering.material 010502 geochemistry & geophysics 01 natural sciences Ferromanganese chemistry.chemical_compound Nickel chemistry Meteorite Earth and Planetary Sciences (miscellaneous) engineering General Earth and Planetary Sciences Wüstite Geology 0105 earth and related environmental sciences Magnetite |
| Zdroj: | Doklady Earth Sciences. 491:199-203 |
| ISSN: | 1531-8354 1028-334X |
| Popis: | 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 wustite 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|