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

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

doi:https://doi.org/10.5194/ejm-36-99-2024

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:

(Ultra)high-pressure metamorphism, from crystal to orogenic...

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

Supplement

https://doi.org/10.5194/ejm-36-99-2024-supplement

Model code and software

PCalc2.4 G. Godard https://doi.org/10.13140/RG.2.2.17290.03527

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.