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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Cited articles

Ahn, K. S. and Nakamura, Y.: The natural reaction muscovite + chlorite + chloritoid = andalusite + biotite + quartz + H2O and a new petrogenetic grid, Geosci. J., 4, 25–39,, 2000. 
Baltatzis, E.: Distribution of Fe and Mg between garnet and biotite in Scottish Barrovian metamorphic zones, Mineral. Mag., 43, 155–157,, 1979. 
Baltatzis, E. and Wood, B. J.: The occurrence of paragonite in chloritoid schists from Stonehaven, Scotland, Mineral. Mag., 41, 211–216,, 1977. 
Banerjee, M., Dutta, U., Anand, R., and Atlas, Z. D.: Insights on the process of two-stage coronae formation at olivine-plagioclase contact in mafic dyke from Palghat Cauvery Shear Zone, southern India, Mineral. Petrol., 113, 625–649,, 2019. 
Bickle, M. J. and Archibald, N. J.: Chloritoid and staurolite stability: implications for metamorphism in the Archaean Yilgarn Block, western Australia, J. Metamorph. Geol., 2, 179–203,, 1984. 
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.