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Minerals 2018, 8(5), 204; https://doi.org/10.3390/min8050204

Oxidation States of Fe in Constituent Minerals of a Spinel Lherzolite Xenolith from the Tariat Depression, Mongolia: The Significance of Fe3+ in Olivine

1
Faculty of Science, Shinshu University, 3-1-1, Asahi, Matsumoto 390-8621, Japan
2
Division of Evolution of Earth Environments, Graduate School of Social, Cultural Studies, Kyushu University, Fukuoka 810-8560, Japan
3
Department of Geoscience, Graduate School of Science and Engineering, Shimane University, Matsue 690-8504, Japan
4
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8567, Japan
5
Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
6
School of Geology and Mining Engineering, Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia
*
Author to whom correspondence should be addressed.
Received: 26 March 2018 / Revised: 30 April 2018 / Accepted: 6 May 2018 / Published: 9 May 2018
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Abstract

The oxidation states of Fe within olivine, orthopyroxene, clinopyroxene, and spinel in a spinel lherzolite xenolith from the Tariat Depression, Mongolia were investigated using 57Fe Mössbauer spectroscopy to evaluate the redox condition of the upper mantle from which the Tariat spinel lherzolite xenolith was derived. The purity of separated minerals for the Mössbauer spectroscopic analysis was examined using X-ray powder diffraction, Raman spectroscopy, and transmission electron microscopy. Average Fo and Fe contents of olivine at the core part of the xenolith are 89.9(4) mol % and 0.195(3) atoms per formula unit, respectively. The Fe3+/ΣFe values of the olivine, orthopyroxene, clinopyroxene, and spinel, determined by Mössbauer spectroscopic analysis, are 0.027(2), 0.15(1), 0.26(3), and 0.34(5), respectively. The Mössbauer spectrum of olivine consists of two doublets assigned to Fe2+ at the octahedral sites and one doublet, with I.S. of 0.40(2) mm/s and Q.S. of 0.69(3) mm/s assigned to Fe3+ at the octahedral site. Since the Tariat spinel lherzolite xenolith in this study shows no evidence of metasomatism or thermal alteration, the existence of a small amount of Fe3+ in olivine and the fairly high Fe3+ contents of clinopyroxene, orthopyroxene, and spinel imply that the upper mantle under the Tariat area was in a rather oxidized condition. View Full-Text
Keywords: spinel lherzolite xenolith; oxidation state of Fe; 57Fe Mössbauer spectroscopy; Mongolia; Tariat Depression spinel lherzolite xenolith; oxidation state of Fe; 57Fe Mössbauer spectroscopy; Mongolia; Tariat Depression
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Ejima, T.; Osanai, Y.; Akasaka, M.; Adachi, T.; Nakano, N.; Kon, Y.; Ohfuji, H.; Sereenen, J. Oxidation States of Fe in Constituent Minerals of a Spinel Lherzolite Xenolith from the Tariat Depression, Mongolia: The Significance of Fe3+ in Olivine. Minerals 2018, 8, 204.

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