European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 35, issue 2
Articles | Volume 35, issue 2
https://doi.org/10.5194/ejm-35-305-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-35-305-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 35, issue 2
Research article
 | 
02 May 2023
Research article |  | 02 May 2023

Equilibrium and kinetic approaches to understand the occurrence of the uncommon chloritoid + biotite assemblage

Sara Nerone, Chiara Groppo, and Franco Rolfo

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Latest update: 13 Oct 2026
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Short summary
The coexistence of chloritoid and biotite in medium-pressure Barrovian terranes is uncommon, with chloritoid usually occurring at lower temperatures than biotite. A petrologic approach using equilibrium thermodynamic modelling points out how metapelites can attain H2O-undersaturated conditions even at medium pressure and amphibolite-facies conditions and consequently can be affected by kinetic barriers, which need to be taken into account.
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