Structural and magnetic microinhomogeneities in accessory spinel of the system Fe 2+(Cr 2-xFe x 3+)O 4 from the Kytlym massif (Urals platinum-bearing belt) / Sherendo T.A., Martyshko P.S., Moloshag V.P., Garaeva A.A., Zamyatin D.A., Mitrofanov V.Y., Pamyatnykh L.A. // Russian Geology and Geophysics. - 2012. - V. 53, l. 9. - P. 853-860.

ISSN:
10687971
Type:
Article
Abstract:
The microstructure and magnetic properties of accessory Fe-Cr-spinels from the Kytlym massif of the Urals platinum-bearing belt were studied. Atypical Fe-Cr-spinels in the form of magnetic microareas in grains of primary nonmagnetic Fe-Cr-spinel have been revealed for the first time in the bed dunites of the Kytlym multiphase concentrically zoned massif, North Urals. These spinels are responsible for the magnetic properties of the dunites. It has been established that the microareas are separations in solid solution Fe 2+(Cr 2-xFe x 3+)O 4, which are enriched in Fe 3+ and are probably an intermediate product of the transformation of primary accessory Fe-Cr-spinel during the formation of the dunite massif. These are magnetic microphases with particular chemical composition, cation distribution, and corresponding reversed crystal lattice, which determine the main magnetic properties of the microarea: the magnitude and direction of magnetization vector and Curie temperature. The formation of this earlier unknown type of magnetic Fe-Cr-spinel is probably conjugate with the formation and concentration of PGE mineralization in the bed dunites of the Kytlym platinum-bearing massif. The presence of such magnetization carriers in rocks and ores must be taken into account in geophysical research at the Urals chromite and platinum-chromite deposits. © 2012.
Author keywords:
Dunite; Fe-Cr-spinel; Magnetization carrier; Microphase; Structural microinhomogeneity; Urals platinum-bearing belt
Index keywords:
chemical composition; dunite; inhomogeneity; magnetic property; magnetization; microstructure; mineralization; platinum; separation; spinel; Kytlym Massif; Russian Federation; Sverdlovsk
DOI:
10.1016/j.rgg.2012.07.002
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Affiliations Institute of Geophysics, Ural Branch of the Russian Academy of Sciences, Ul. Amundsena 100, Yekaterinburg, 620016, Russian Federation; Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Pochtovyi per. 7, Yekaterinburg, 620075, Russian Federation; Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, Ul. Amundsena 101, Yekaterinburg, 620016, Russian Federation; Ural State University, Ul. Lenina 51, Yekaterinburg, 620083, Russian Federation
Author Keywords Dunite; Fe-Cr-spinel; Magnetization carrier; Microphase; Structural microinhomogeneity; Urals platinum-bearing belt
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Correspondence Address Sherendo, T.A.; Institute of Geophysics, Ural Branch of the Russian Academy of Sciences, Ul. Amundsena 100, Yekaterinburg, 620016, Russian Federation; email: Tatyana_Sherendo@mail.ru
Language of Original Document English
Abbreviated Source Title Russ. Geol. Geophys.
Source Scopus