Modeling the Variscan Orogeny

Numerical and analogue modeling provides insights into dynamic processes shaping convergent plate boundaries. In the case of the Variscan orogeny, efforts to explain observations using physics-based models started in the late 1990s with 2D numerical simulations and have evolved towards advanced 2D petrological–thermomechanical numerical simulations and limited analogue experiments. Here, we review and discuss advances in six key research directions: (1) pre-orogenic processes, (2) buoyancy-versus tectonics-driven exhumation of high-pressure–high-temperature rocks, (3) relamination and trans-lithospheric diapirism, (4) origin of complex pressure–temperature paths, (5) origin of crust–mantle rock associations, and (6) origin of ultra-potassic and alkaline magmatism. We conclude by outlining future research directions that require the continuation of joint cross-disciplinary efforts of “modelers” and “observers.”

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December 2025 --The Variscan Orogeny in Europe – Understanding Supercontinent Formation

The Variscan orogen formed between 380 and 300 million years ago through several accretionary and collisional cycles, culminating with the construction of the Pangea supercontinent. This process occurred via sequential opening and closure of oceanic basins, synchronous detachment of Gondwana derived continental ribbons, and their outboard amalgamation onto the Laurussia margin. The Variscan orogen is rather unique compared with other orogenic belts on Earth: its overthickened and dominantly magmatic crust in the central belt, surprisingly minor mantle involvement in the magmatic and geodynamic processes, coherent and pulsed magmatism along the collision suture, and its complex accretionary history. Because its final product, Pangea, is the youngest and best-understood supercontinent on Earth, the Variscan orogeny offers clues for understanding the mechanisms of supercontinent formation.