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Application of chlorite thermometry to estimation of formation temperature and redox conditions

Published online by Cambridge University Press:  18 June 2018

Atsuyuki Inoue ,
Sayako Inoué  and
Minoru Utada
Atsuyuki Inoue*
Affiliation:
Chiba University, Chiba 263-8522, Japan
Sayako Inoué
Affiliation:
Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA
Minoru Utada
Affiliation:
Futo, Ito, Shizuoka 413-0231, Japan
*
*Email: atinoue@earth.s.chiba-u.ac.jp
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Abstract

Diverse applications of chlorite thermometry have been considered for better understanding the formation process in nature. Here, an approach which combined a semi-empirical thermometer (Inoue et al., 2009) with the method of Walshe (1986) was tested to estimate the redox conditions (log fO2) and the formation temperature, using the literature data from Niger, Rouez and St Martin and new data for chlorite which coexists with pink-coloured epidote in the Noboribetsu geothermal field. The log fO2 predicted for the former data sets were compatible with those estimated by Vidal et al. (2016), suggesting that the present approach is valid for quantifying the variations in log fO2. The Noboribetsu chlorites have lower Fe/(Fe + Mn + Mg) and greater Fe3+/ΣFe ratios than those observed in adjacent propylite rocks. The peculiar mineral assemblage and chemical composition are attributed to the formation under higher fO2 conditions and possibly low Fe concentration in the alteration fluids.

Keywords

chlorite thermometryredox conditionshydrothermal alterationpinkish epidote
Type
Article
Information
Clay Minerals , Volume 53 , Issue 2 , June 2018 , pp. 143 - 158
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

This paper was presented during the session: ‘MI-04: Diversity of chlorites’ of the 2017 International Clay Conference

Guest Associate editor: V. Trincal

†

Deceased

References

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