Fluids in Planetary Systems

At our first inaugural meeting last April, we sifted through several pages of potential topics. Some had been suggested by the councils of the par- ticipating societies; others had been gathered at meetings, while talking to colleagues. We strived to choose topics that would be of interest to a wide part of our membership – in each of these issues, mineralogists, geochemists, and petrologists should find at least one article of great interest to them – but also topics where exciting developments are underway. We also needed to find guest editors and authors willing to work under very tight deadlines. It you are interested in proposing a topic, you can download a propos- al form from our web site. We are already developing themes for 2006 and 2007. Here is what you can look forward to in 2005.

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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.