Nathaniel Scharping is a contributing writer for Eos.org.
The Andean Plateau in South America rises, on average, more than 4,000 meters above sea level, formed by orogenic uplift that began more than 20 million years ago. Orogeny occurs at convergent plate margins as compressed plates crumple upward, resulting in mountain ranges and associated geological features.
In a new study, Quiroga et al. combined multiple data sources to track the evolution of stress and crustal deformation across the Puna region in the south central Andean Plateau over the past 24 million years. The researchers used satellite imagery to map the current structural features of the plateau. With a technique called forward modeling, they used the results of this mapping to reconstruct the geometric shifts of past deformations. They also used uranium-lead dating to determine the ages of zircons—hardy minerals whose makeup can provide clues about the conditions in which they formed—from the region.
Understanding the Andean Plateau's uplift in a changing stress regime, rather than in a uniform state over time, has implications for broader research into how mountain ranges form. The progression identified in the new study is similar to orogenic evolutions proposed for the Tibetan Plateau and the Peruvian Andes, according to the authors.
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