Skip to Main content Skip to Navigation
Journal articles

Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence

Abstract : Understanding lava dome eruptions is a major concern in volcanology regarding the assessment of associated hazards. This question is usually addressed through the study of active calc-alkaline domes, however, alkaline domes remaining poorly known. The Puy de Dôme is the most prominent volcano of the Chaîne des Puys Quaternary intraplate volcanic field in the French Massif Central. It is a complex trachytic lava dome ca. 11 ka old. Field investigations, geomorphological and petro-geochemical studies were performed to understand the magmatic system of this dome and reconstruct its volcanic evolution. The different lava facies were fully characterised and their relationships with the volcano building stages have been established. A new four-step evolution is proposed for the growth of this edifice. Mineralogical and geochemical variations document magmatic differentiation with self-mixing and minor crustal contamination in a zoned reservoir within the upper crust. Magma mixing and crustal contamination through fluids interactions during magma ascent and the involvement of fumarolic activity throughout the edifice building are also documented. Further, this work highlights the specific features of the Puy de Dôme compared to calc-alkaline domes: lack of lava flows and almost complete magma degassing during ascent, resulting in the lack of significant explosive activity until the last eruption step.
Complete list of metadatas

Cited literature [109 references]  Display  Hide  Download

https://hal.uca.fr/hal-02435148
Contributor : Sylvaine Jouhannel <>
Submitted on : Friday, November 20, 2020 - 2:25:48 PM
Last modification on : Saturday, November 21, 2020 - 3:29:40 AM

File

Manuscript modified 26122019 D...
Files produced by the author(s)

Licence


Copyright

Identifiers

Citation

Catherine Deniel, Pierre Boivin, Didier Miallier, Marie-Christine Gerbe. Multi-stage growth of the trachytic lava dome of the Puy de Dôme (Chaîne des Puys, France). Field, geomorphological and petro-geochemical evidence. Journal of Volcanology and Geothermal Research, Elsevier, 2020, 396, pp.106749. ⟨10.1016/j.jvolgeores.2019.106749⟩. ⟨hal-02435148⟩

Share

Metrics

Record views

201

Files downloads

76