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Al-free di-trioctahedral substitution in chlorite and a ferri-sudoite end-member

Published online by Cambridge University Press:  02 January 2018

Vincent Trincal  and
Pierre Lanari
Vincent Trincal*
Affiliation:
Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Bourgogne Franche-Comté, 16 Route de Gray, F-25000 Besançon, France
Pierre Lanari
Affiliation:
Institute of Geological Sciences, University of Bern, Baltzestrasse 1+3, CH-3012 Bern, Switzerland
*
*E-mail: [email protected]
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Abstract

A compilation of Fe3+-bearing chlorite analyses is used: (1) to investigate the Alfree di-trioctahedral (AFDT) substitution 2Fe3+ +□= 3(Mg,Fe2+) in chlorite; and (2) to estimate the composition of a ferri-sudoite end-member (Si3Al)[(Fe2+,Mg)2□Al]O10(OH)8 within the chlorite solid-solution domain. According to our observations, up to two Fe3+ cations might be allocated in the M2-M3 chlorite sites by the substitution AFDT, which does not involve Al. These unexpected observations were made possible by the development of μXANES techniques allowing in situ measurements of XFe3+ (Fe3+/(Fe2+ + Fe3+)) in heterogeneous chlorite. Although further studies are required to confirm the crystallographic position of Fe3+ and refine its ionic/ magnetic behaviour in chlorite, this development creates opportunities for developing new geothermometers.

Keywords

chloriteμXANESgeothermometrysudoite
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 4 , September 2016 , pp. 675 - 689
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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Footnotes

†

This work was originally presented during the session ‘The many faces of chlorite’, part of the Euroclay 2015 conference held in July 2015 in Edinburgh, UK.

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