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Recommendations for Kübler Index standardization

Published online by Cambridge University Press:  02 January 2018

L.N. Warr  and
R. Ferreiro Mählmann
L.N. Warr*
Affiliation:
Institut für Geographie und Geologie, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
R. Ferreiro Mählmann
Affiliation:
Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
*
*Email: [email protected]
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Abstract

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Following a round-table discussion at the Mid-European Clay Conference in Dresden 2014, new recommendations for illite ‘crystallinity’ Kübler index standardization have been agreed upon. The use of Crystallinity Index standards in the form of rock-fragment samples will be continued, along with the same numerical scale of measurement presented by Warr & Rice (1994). However, in order to be compatible with the original working definition of Kübler's (1967) anchizone, the upper and lower boundary limits of the Crystallinity Index Standard (CIS) scale are adjusted appropriately from 0.25°2θ and 0.42°2θ to 0.32°2θ and 0.52°2θ. This adjustment is based on an inter-laboratory correlation between the laboratories of Basel, Neuchâtel and the CIS scale. The details of this correction are presented in this first note, as discussed at the round-table meeting and will be further substantiated by a correlation program between CIS and former Kübler–Frey–Kisch standards.

Keywords

Kübler indexCrystallinity Index StandardKübler–Frey–Kisch standardsVery-low-grade metamorphismanchizone
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 3 , August 2015 , pp. 283 - 286
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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