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February 2013 – Volume 9 Number 1 

One Hundred Years of Geochronology

GUEST EDITORS
Daniel J. Condon and Mark D. Schmitz

PRINCIPAL EDITOR
John W. Valley

April 2013 – Volume 9 Number 2 

Serpentinites

GUEST EDITORS
Stéphane Guillot and Keiko Hattori

PRINCIPAL EDITOR
Georges Calas

June 2013 – Volume 9 Number 3

The Mineral-Water Interface

GUEST EDITORS
Christine V. Putnis and Encarnación Ruiz-Agudo

PRINCIPAL EDITOR
Patricia M. Dove

August 2013 – Volume 9 Number 4

Continental Crust at Mantle Depths

GUEST EDITOR
Jane A. Gilotti

PRINCIPAL EDITOR
John W. Valley

October 2013 – Volume 9 Number 5 

Nitrogen and Its (Biogeocosmo) Chemical Cycling

GUEST EDITORS
Gray E. Bebout, Marilyn L. Fogel, and Pierre Cartigny

PRINCIPAL EDITOR
James I. (Tim) Drever

December 2013 – Volume 9 Number 6 

Garnet: Common Mineral, Uncommonly Useful

GUEST EDITORS
Ethan F. Baxter, Mark J. Caddick, and Jay J. Ague

PRINCIPAL EDITOR
Georges Calas

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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.