Cordillera de Doña Ana

Cordillera de Doña Ana. It is a mountain range located within the Andes of northern Chile, specifically in the Atacama Region. The range forms part of the high-altitude Puna de Atacama plateau and is characterized by its rugged, arid terrain and significant mineral deposits. Its presence has influenced regional hydrology, ecology, and human activity for centuries.

Geography

The range is situated east of the Salar de Maricunga and the Copiapó River basin, forming a significant segment of the continental divide in this part of the Andes. Major peaks within the system include Cerro Doña Ana, Volcán Copiapó, and Nevado Tres Cruces, the latter being part of the adjacent Nevado Tres Cruces National Park. The topography is marked by deep valleys, such as those draining into the Salar de Pedernales, and high-altitude plains known as *pampas*. This geography creates a rain shadow effect, intensifying the hyper-arid conditions of the surrounding Atacama Desert, one of the driest places on Earth. The range's meltwater feeds intermittent streams that are critical for the sparse settlements and mining operations in provinces like Copiapó and Chañaral.

Geology

Geologically, the range is part of the Central Volcanic Zone of the Andes, a belt known for its stratovolcanoes and extensive ignimbrite deposits from massive caldera-forming eruptions during the Miocene and Pliocene epochs. The bedrock is primarily composed of andesite, dacite, and rhyolite, with significant intrusions of porphyry copper systems that are economically vital to Chile. These formations are associated with major mineralized districts, including parts of the famed Manto Verde copper deposit. The region exhibits active tectonics, with the Nazca Plate subducting beneath the South American Plate, driving both volcanism and the creation of high-angle thrust faults that uplift the range. Evidence of past glacial activity is present in the form of moraines and U-shaped valleys.

Ecology

The extreme altitude and aridity create a specialized ecosystem within the Central Andean dry puna ecoregion. Sparse vegetation is dominated by hardy species like the *llareta* (*Azorella compacta*) and various cushion plants, alongside grasses of the genus *Festuca*. Fauna is adapted to the harsh conditions and includes the threatened Andean flamingo (*Phoenicoparrus andinus*), which breeds in high-altitude lakes like those near Nevado Tres Cruces, the vicuña (*Vicugna vicugna*), and the Andean fox (*Lycalopex culpaeus*). Avian diversity also features the Andean condor (*Vultur gryphus*) and the Diademed Sandpiper-Plover (*Phegornis mitchellii*). The fragile biotic communities are highly sensitive to changes in the limited water supply from snowmelt and to human disturbance from mining and tourism.

History

The area has been part of indigenous territories for millennia, used by the Diaguita and later the Inca Empire as a corridor and a source of mineral resources. Following the Spanish conquest of the Inca Empire, the region became part of the Captaincy General of Chile. In the 19th century, it was mapped during various boundary surveys and expeditions, such as those following the War of the Pacific, which solidified Chile's control over the Atacama Desert. The late 19th and 20th centuries saw a mining boom, with prospectors and companies like those operating at Manto Verde exploring the range's mineral potential. The construction of roads, such as the Ruta CH-31 which passes nearby, improved access but also increased environmental pressure.

Conservation

Parts of the range fall within or near protected areas designed to conserve its unique landscapes and biodiversity. The adjacent Nevado Tres Cruces National Park and the Llanos de Challe National Park offer some protection to connected ecosystems. Conservation challenges are significant, primarily stemming from water extraction and pollution associated with large-scale copper mining operations, such as those run by Codelco and other companies. Climate change poses a long-term threat by altering precipitation patterns and accelerating glacial retreat on peaks like Volcán Copiapó. Efforts by organizations like CONAF (Corporación Nacional Forestal) focus on monitoring wildlife, particularly the vicuña and flamingo populations, and managing the impacts of growing adventure tourism and off-road vehicle use in this vulnerable alpine desert environment.

Category:Mountain ranges of Chile Category:Andes Category:Atacama Region