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Amphiboles from the Kola Superdeep Borehole: Fe3+ contents from crystal-chemical analysis and Mössbauer spectroscopy

Published online by Cambridge University Press:  05 July 2018

Y. Uvarova ,
E. Sokolova ,
F. C. Hawthorne ,
C. A. McCammon ,
V. I. Kazansky  and
K. V. Lobanov
Y. Uvarova
Affiliation:
Department of Geological Sciences, University of Manitoba Winnipeg, Manitoba, Canada R3T 2N2
E. Sokolova
Affiliation:
Department of Geological Sciences, University of Manitoba Winnipeg, Manitoba, Canada R3T 2N2 Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 119017 Moscow, Russia
F. C. Hawthorne*
Affiliation:
Department of Geological Sciences, University of Manitoba Winnipeg, Manitoba, Canada R3T 2N2
C. A. McCammon
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
V. I. Kazansky*
Affiliation:
Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 119017 Moscow, Russia
K. V. Lobanov
Affiliation:
Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 119017 Moscow, Russia
*
E-mail: frank_hawthorne@umanitoba.ca
†E-mail: kazansky@igem.ru
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Abstract

The crystal structures of a suite of amphiboles from the Kola Superdeep Borehole, Russia, have been refined to R values of ∼3% using single-crystal Mo-Kα X-ray diffraction data. The same crystals used in the collection of the intensity data were subsequently analysed by electron microprobe (EMP) and milliprobe Mössbauer spectroscopy. Site populations were assigned from the results of site-scattering refinement and stereochemical analysis, taking into account the unit formula determined for each crystal. The Fe3+/(Fe2++Fe3+) values were derived (1) by least-squares refinement of the Mössbauer spectra, and (2) SREF (Structure REFinement) by careful analysis of the mean bond lengths at the M(2) site using two possible models for the behaviour of Ti4+: (i) Ti4+ at M(2); and (ii) Ti4+ at M(1). The agreement between the SREF and Mössbauer/EMP values for Fe3+ is very close for Ti4+ assigned to M(2). This result indicates that the calculation of Fe3+ contents in amphiboles from refined site populations and <M(2)–O> distances are accurate. This paper presents the first confirmation of this result.

Keywords

amphibolecrystal-structure refinementelectron microprobe analysisMössbauer spectroscopyKola Superdeep Borehole
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 6 , December 2007 , pp. 651 - 669
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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