New Opportunities at Emerging Facilities

Synchrotron X-ray sources and pulsed neutron sources are getting brighter. This permits new opportunities for scattering, spectroscopy, and imaging studies of Earth materials and processes that were not possible a decade ago. The impact of these latest-generation facilities on Earth sciences research requiring nanometer- to micrometer-scale resolution is growing and will continue to grow as next-generation X-ray and neutron sources become available over the next six years. These facilities will include the world’s first X-ray free-electron lasers in the US (2009) and Europe (2012) and the Spallation Neutron Source at Oak Ridge National Laboratory, USA (2006). In addition, five nanoscale science research centers are under con- struction in the US and will impact the emerging field of nanogeoscience.

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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.