Ojos del Salado
Nevado Ojos del Salado is a stratovolcano in the Andes on the Argentina–Chile border and the highest active volcano in the world at 6,893 m (22,615 ft). It is also the second highest mountain in both the Western Hemisphere and the Southern Hemisphere and the highest in Chile. It is located about 600 km (370 mi) north of Aconcagua, the highest mountain in both the Western and Southern Hemisphere, at 6,961 m (22,838 ft).
|Ojos del Salado|
The volcano looming on the horizon.
|Elevation||6,893 m (22,615 ft) |
|Prominence||3,688 m (12,100 ft) |
|Isolation||631 kilometres (392 mi)|
|Listing||Volcanic Seven Summits|
Seven Second Summits
Country high point
|Topo map||Highest mountain: Highest Mountain in Chile|
|Last eruption||700 AD ± 300 years|
|First ascent||February 26, 1937 by Jan Alfred Szczepański and Justyn Wojsznis|
Due to its location near the Atacama Desert, the mountain has very dry conditions, with snow usually only remaining on the peak during winter, though heavy storms can cover the surrounding area with a few feet of snow even in summer. Despite the generally dry conditions, there is a permanent crater lake about 100 m (330 ft) in diameter at an elevation of 6,390 m (20,960 ft) on the eastern side of the mountain. This is most likely the highest lake of any kind in the world.
The ascent of Ojos del Salado is mostly a hike except for the final section to the summit which is a difficult scramble that may require ropes. The first ascent was made in 1937 by Jan Alfred Szczepański and Justyn Wojsznis, members of a Polish expedition in the Andes.
Its name, meaning roughly "Eyes of the Salty One" in Spanish, comes from the enormous deposits of salt that, in the form of lagoons or “eyes”, appear in its glaciers. An international highway between Chile and Argentina runs north of the mountain.
Geology and geomorphologyEdit
Volcanic activity in the region commenced 26 million years ago in the Cordillera Claudio Gay, at the same time as the neighbouring Maricunga Belt volcanoes were active. Starting 18 million years ago, local subduction of the Nazca Plate beneath the South America Plate became increasingly shallower and this caused volcanism to shift from the Maricunga Belt to the Ojos del Salado region.
The Paleozoic basement crops out only northwest of Nevado Tres Cruces. Other geologic units in the region are Oligocene sedimentary units and volcanic rocks ranging from Oligocene age to less than 1.5 million years old. The area is part of a tectonic boundary between a volcanically active region north of the boundary and a less volcanically active region south of the boundary, which is also characterized by geographical differences, e.g. the presence of transverse valleys.
Ojos del Salado like other major neighbouring mountains is a complex of lava domes and lava flows, with the main summit surrounded by peripheral domes such as El Solo and El Fraile and many other lateral centres. Fumaroles are encountered at the summit of Ojos del Salado within a depression. Potassium-argon dating has yielded ages of 1.2 ± 0.3 million years ago and less than 1 million years ago from rocks north of Ojos del Salado.
There are glaciers on the mountain, in the crater and in the form of penitentes which reach heights of 8–5 metres (26–16 ft). Other reports indicate the absence of glaciers on Ojos del Salado. Permafrost exists on the mountain and its melting nourishes several lakes; one lake fed by a creek lies at 6,500 metres (21,300 ft) altitude.
Ojos del Salado is an active volcano, but the question of whether it should be considered currently (or "historically") active is arguable. According to the Smithsonian Institution's Global Volcanism Program, the most recent known eruption was about 1,300 years ago, with a large margin of uncertainty. However, there is also some evidence for a minor ash emission in 1993, which would definitely qualify the volcano as historically active. The presence of fumaroles high on the mountain and recent-looking lava flows, albeit of uncertain age, also argues in favor of a categorization as "active." By these definitions, Ojos del Salado is the highest historically active volcano on Earth. If the older date is accepted, the title of "highest historically active volcano" might reside instead with the somewhat lower Llullaillaco volcano, which certainly has erupted in historic times (most recently in 1877) and is considered active.
The elevation of Ojos del Salado has been the subject of debate. The mountain is hidden behind other peaks and thus its height was not appreciated in early research until 1937, when the mountain was climbed by Polish climbers.
A 2006 article in Andes Magazine offered that Ojos del Salado may be higher than Aconcagua, although the argument was premised on older, less accurate altitude surveys. The results of these older surveys assigned Ojos del Salado an elevation of 7,057 m (23,153 ft), which would have made it nearly 100 m (330 ft) higher than Aconcagua. As early as 1955, an estimate was made that the elevation of Ojos del Salado was 7,100 m (23,300 ft), but that was "simply [...] based on the altitude of the final camp, and the hours of ascent to the summit." In 1956, the first Chilean expedition led by the retired lieutenant René Gajardo measured the height of Ojos del Salado as 7,084 m (23,241 ft) with a pocket pressure altimeter. Apart from being an inexact method, the height shown by the altimeter was far too high as air pressure is generally lower in the afternoon, the time at which the team reached the summit.
An expedition to the area in the 1990s claimed that nearby Monte Pissis was even higher than Ojos del Salado. Later measurements using more precise equipment showed that Ojos del Salado is about 100 m (330 ft) higher than Pissis. Furthermore, in 2007 a Chilean–Argentine–European expedition organized by Andes Magazine and Azimut 360 performed a survey on both Ojos del Salado and Monte Pissis using more accurate instruments. It found the former to be 6,891 m (22,608 ft) and the latter 6,793 m (22,287 ft) Although this fits within recent handheld GPS surveys, which have estimated the mountain to be between 6,880 m (22,570 ft) and 6,910 m (22,670 ft), the vertical error margin of the expedition's equipment, 10 m (33 ft), leaves uncertainty as to the mountain's more precise altitude.
Ojos del Salado has two summits, one in Argentina and the other in Chile (the border between the two countries runs between the two summits). The difference in elevation of the two summits is less than 1 m (3 ft 3 in)
Motorized partial ascentEdit
Ojos del Salado has been a popular mountain for attempts to attain the highest altitude aboard a land vehicle.
The current record altitude for a four-wheeled vehicle was set on April 21, 2007 by the Chilean duo of Gonzalo Bravo G. and Eduardo Canales Moya. Reaching an altitude of 6,688 meters (21,942 ft.) with a modified Suzuki Samurai, the duo beat the previous record of 6,646 m which had been set on March 13, 2007 by German Matthias Jeschke in a Jeep Wrangler Unlimited Rubicon.
Jeschke currently holds the high altitude record for trucks reaching a height of 6,675 meters (21,899 ft) with a Mercedes-Benz Zetros truck on March 6, 2015. This is also a world record for a diesel-powered engine.
On April 19, 2015 Chilean Gianfranco Bianchi reached an altitude of 6,472 m (21,233 ft) with a Suzuki RMZ 450, setting the altitude record for a motorcycle.
The latest publicized record attempt commenced on November 6, 2017 and again involved Matthias Jeschke. With two RMMV HX trucks Jeschke attempted to gain two world records, one for construction at altitude and the other by beating the current 6,688 m record. A refuge hut was built at 6,100 m (a record), but on December 19 it was announced the altitude record attempt had been called off at a height of 6,150 m for a combination of factors including an insurmountable rock barrier and adverse weather conditions. A further attempt may be made in early 2018.
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