Articles | Volume 35, issue 2
https://doi.org/10.5194/ejm-35-305-2023
https://doi.org/10.5194/ejm-35-305-2023
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, https://doi.org/10.1007/BF02910211, 2000. 
Baltatzis, E.: Distribution of Fe and Mg between garnet and biotite in Scottish Barrovian metamorphic zones, Mineral. Mag., 43, 155–157, https://doi.org/10.1180/minmag.1979.043.325.16, 1979. 
Baltatzis, E. and Wood, B. J.: The occurrence of paragonite in chloritoid schists from Stonehaven, Scotland, Mineral. Mag., 41, 211–216, https://doi.org/10.1180/minmag.1977.041.318.08, 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, https://doi.org/10.1007/s00710-019-00674-y, 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, https://doi.org/10.1111/j.1525-1314.1984.tb00295.x, 1984. 
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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.