Wednesday, March 20, 2013
The Andes mountain range originated by the collision of the Nazca tectonic plate against the South American plate 45 million years ago, during the Tertiary. It was the result of a collision of plates, with the Nazca plate sliding underneath the South American one, lifting geological materials up to great heights amid intense volcanic activities. This slow geological process that formed the Andes range is still going on, causing strong earthquakes and sunamis in the Chilean and Peruvian coastal regions. Igneous rocks, which are part of the western edge of the South American crystalline basement rock, were raised above 6,000 m of altitude.