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57Fe-Mössbauer investigation on garnets from the Ivrea-Verbano Zone

Published online by Cambridge University Press:  05 July 2018

Simona Quartieri ,
Gilberto Artioli ,
Antonio Deriu ,
Pier Paolo Lottici  and
Gianni Antonioli
Simona Quartieri
Affiliation:
Istituto di Mineralogia e Petrologia, Universitá di Modena, via S. Eufemia 19, 1-41100 Modena, Italy
Gilberto Artioli
Affiliation:
Istituto di Mineralogia e Petrologia, Universitá di Modena, via S. Eufemia 19, 1-41100 Modena, Italy
Antonio Deriu
Affiliation:
Dipartimento di Fisica, Universitá di Parma, Viale delle Scienze, 1-43100 Parma, Italy
Pier Paolo Lottici
Affiliation:
Dipartimento di Fisica, Universitá di Parma, Viale delle Scienze, 1-43100 Parma, Italy
Gianni Antonioli
Affiliation:
Dipartimento di Fisica, Universitá di Parma, Viale delle Scienze, 1-43100 Parma, Italy
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Abstract

A Mössbauer investigation has been carried out on garnets from the Ivrea-Verbano zone and the results are compared with those obtained on the same samples by X-ray absorption spectroscopy (XAS). The problem addressed is the precise structural characterisation of the local environment of iron in garnets with Fe/Ca ratio variable between ∼3.0 and ∼18.0. Ferric iron is octahedrally coordinated and ferrous iron is in the dodecahedral site in all the samples. Mössbauer results are in agreement with those obtained by XAS and show that, at least in the compositional range of the garnets examined (0.1-0.5 calcium atoms p.f.u.), the iron environment is not significantly modified by the larger calcium cations sharing the same dodecahedral site. It is confirmed that the Mössbauer technique is more sensitive than XAS in detecting low percentages of iron, especially when the cation is present in more than one oxidation state and coordination number.

Keywords

Mössbauer spectragarnetscrystal chemistryIvrea-Verbano zone
Type
Mineralogy
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 671 - 676
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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Footnotes

*

Present address: Dipartimento di Scienze della Terra, Sez. Mineralogia, Università di Milano, Milano, Italy.

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