3-D thermomechanical geodynamic modelling of heating and volcanism in the Massif Central (France) and Eifel Volcanic Region (Germany)

E. Momoh; S. Tait; H S. Bhat

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arXiv · 2609.27907

3-D thermomechanical geodynamic modelling of heating and volcanism in the Massif Central (France) and Eifel Volcanic Region (Germany)

E. Momoh·S. Tait·H S. Bhat

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Abstract

The French Massif Central and the Eifel Volcanic Field represent two of the enigmatic features in France and Germany, respectively. Both areas have been affected by Cenozoic volcanism whose origin is still debated. Using 3-D numerical geodynamic modelling of recently developed solid-mechanical constitutive laws including viscoelastic-viscoplastic behaviour, we explored a new hypothesis to highlight the contribution of localised deformational (inelastic) heating towards the evolution of localised volcanism as being due to far-field-induced compressive stresses from the Africa-Eurasia convergence. Our simulations show that variations in crustal thicknesses can help localise inelastic strain near the Moho of relatively thicker crust, which leads to enhanced heating. Localised viscoplastic deformation above the brittle-ductile transition in the crust also formed conjugate deformation bands, resulting in localised changes in the topography which can be compared to present-day topography. The first-order picture that emerges from our simulations shows an association of elevated topography and tectonic structures that localise deformation, with a geothermal anomaly sufficient to explain the elevated heat flow and cause a potential localised zone for partial melting in hydrated or CO\textsubscript{2}-bearing mantle below the Moho.

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E. Momoh, S. Tait, H S. Bhat. 2026-08-21. 3-D thermomechanical geodynamic modelling of heating and volcanism in the Massif Central (France) and Eifel Volcanic Region (Germany). https://arxiv.org/abs/2609.27907

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