European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 36, issue 1
Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-99-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-36-99-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 36, issue 1
Research article
 | 
19 Jan 2024
Research article |  | 19 Jan 2024

Île Dumet (Armorican Massif, France) and its glaucophane eclogites: the little sister of Île de Groix

Gaston Godard, David C. Smith, Damien Jaujard, and Sidali Doukkari

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Latest update: 01 Jul 2025
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Short summary
Petrological and mineralogical studies of mica schists, orthogneisses and glaucophane eclogites from Dumet Island (Armorican Massif, NW France) indicate that this occurrence, which has undergone high-pressure metamorphism up to 16 kbar and 620 °C, is similar to that of Groix Island. There are about 10 similar occurrences within the Ibero-Armorican Arc, forming a discontinuous high-pressure belt, but most of them have remained unnoticed due to a high degree of retrogression.
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(Ultra)high-pressure metamorphism, from crystal to orogenic...