Fullerenes, carbon nanotubes, and graphene are nanometer-sized forms of carbon with the properties of almost ideal low-dimensional systems. These systems have been at the center of exceptionally intense scientific interest. They have been considered not only as objects of fundamental research but also as components in a wide range of possible applications. In popular science, their names are synonymous with nanotechnology.
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.
