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Electron Microprobe and Raman Spectroscopy Investigation of an Oxygen-Bearing Pt–Fe–Pd–Ni–Cu Compound from Nurali Chromitite (Southern Urals, Russia)

Published online by Cambridge University Press:  29 April 2015

Federica Zaccarini ,
Giorgio Garuti ,
Ronald J. Bakker  and
Evgeny Pushkarev
Federica Zaccarini*
Affiliation:
Department of Applied Geosciences and Geophysics, University of Leoben, A 8700 Leoben, Austria
Giorgio Garuti
Affiliation:
Department of Applied Geosciences and Geophysics, University of Leoben, A 8700 Leoben, Austria
Ronald J. Bakker
Affiliation:
Department of Applied Geosciences and Geophysics, University of Leoben, A 8700 Leoben, Austria
Evgeny Pushkarev
Affiliation:
Ural Division of Russian Academy of Sciences, Institute of Geology and Geochemistry, Str. Pochtovy per. 7, 620151 Ekaterinburg, Russia
*
*Corresponding author.[email protected]
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Abstract

One grain, about 100×80 μm in size, occurring in chromitite associated with the layered sequence of the Nurali mafic-ultramafic complex (Southern Urals, Russia) was investigated by electron-microprobe analyses and Raman spectroscopy. The grain is characterized by a spotty, rugged appearance and chemical zoning from which two compositions were calculated: (Pt0.35Pd0.26Fe0.22Cu0.01Ni0.05)0.98O1.02 and (Fe0.90Pt0.58Ni0.28Pd0.13Cu0.08Rh0.01)1.98O1.02. In the lack of X-ray data, Raman spectroscopy established the presence of a diffuse 500–700 band and a sharp peak at 657 cm−1 of relative wavenumber that strongly resemble the Raman spectra of synthetic PtO and PdO (palladinite). It is concluded that the Nurali grain probably represents a platinum group element (PGE) oxide, and does not consist of a mixture of PGE alloys with Fe oxide or hydroxide as reported for other natural PGE-O compounds.

Keywords

PGE oxideselectron microprobeRaman spectroscopychromititeRussia
Type
EMAS Special Issue
Information
Microscopy and Microanalysis , Volume 21 , Issue 5 , October 2015 , pp. 1070 - 1079
Copyright
© Microscopy Society of America 2015 

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