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Nano-scale microstructure of Fe3+-, OH−-bearing crystalline inclusions in experimentally oxidized olivine from a mantle nodule

Published online by Cambridge University Press:  05 July 2018

N. R. Khisina ,
K. Langer ,
M. Andrut ,
A. V. Ukhanov  and
R. Wirth
N. R. Khisina*
Affiliation:
Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin st. 19, 117975 Moscow, Russia
K. Langer
Affiliation:
Institut für Angewandte Geowissenschaften, TU Berlin, Ernst-Reuter Pl. 1, D-10587 Berlin, Germany
M. Andrut
Affiliation:
Institut für Petrologie, Universität Wien, Geozentrum, Althanstraβe 14, A-1090 Wien, Austria
A. V. Ukhanov
Affiliation:
Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin st. 19, 117975 Moscow, Russia
R. Wirth
Affiliation:
GeoForschungsZentrum Potsdam, Telegrafenberg C-120, D-14473 Potsdam, Germany
*
*E-mail: urusov@geol.msu.ru
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Abstract

An olivine grain from peridotite nodule 9206 (Udachnaya kimberlite) was heated in air at 700°C for 9 h. It was investigated by EMPA, by IR and UV spectroscopy and by TEM. The TEM examination reveals hexagon-like inclusions up to several hundred nm in size with a core and rim structure. The AEM data show that the inclusions contain only Mg, Fe and Si as cations. The rims have almost the same composition as the olivine matrix whereas the cores are enriched in iron and depleted in Mg. Electron diffraction data, SAED and CBED, indicate that the rims are composed of a ‘secondary’ olivine while the cores are composed of coexisting feroxyhite FeOOH, bernalite Fe(OH)3 and β-cristobalite SiO2. The presence of nm-sized inclusions in minerals is expected to influence the interpretation of spectroscopic results if spectroscopy is carried out without knowledge of the microstructure.

It is speculated that the complex microstructure of the inclusions is a result of a solid state transformation of a precursor phase, probably a hydrous magnesian silicate, during the experimental heating and oxidation.

Keywords

olivinelaihunitebernaliteelectron diffractionEELSperidotite
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 2 , April 2000 , pp. 319 - 335
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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