Sairecabur (Spanish pronunciation: [sai̯.ɾe.kaˈβuɾ] ) is a volcano located on the frontier between Bolivia and Chile. It is part of the Andean Central Volcanic Zone. Sairecabur proper is 5,971 metres (19,590 ft) high; other mountains in the range are 5,722 metres (18,773 ft) high Curiquinca, 5,819 metres (19,091 ft) high Escalante and 5,748 metres (18,858 ft) high Cerro Colorado, all of which have erupted a number of lava flows. Also in close proximity to Sairecabur lie the volcanic centres Licancabur, Putana and Juriques.
Sairecabur proper is accompanied by a 4.5-kilometre (2.8 mi) wide caldera. Before the formation of this caldera the volcano may have been 7,000 metres (23,000 ft) high and thus one of the highest volcanoes on Earth. After the formation of this caldera lava effusion occurred during the Pleistocene and Holocene; there is no reported historical activity, however. Eruption products on Escalante and Sairecabur include andesite and dacite. The climate is dry, cold and very sunny.
An Inca sanctuary has been found on Sairecabur, and sulfur mines exist in the mountain chain. More recently, the Receiver Lab Telescope was installed on the volcano. It is the highest submillimeter telescope in the world at an altitude of 5,525 metres (18,127 ft).
West of South America, the Nazca Plate subducts beneath the South America Plate. This process has formed the Andean Volcanic Belt, which is subdivided into the Northern Volcanic Zone, the Central Volcanic Zone and the Southern Volcanic Zone. These belts have different underlying crusts and thus have different typical magma compositions. These volcanic zones are separated from each other by zones where there is no volcanism, associated with a shallow dip of the seismic zone of the subducting plate.
Sairecabur is part of the Andean Central Volcanic Zone (CVZ). 70 kilometres (43 mi), thus the erupted magmas are heavily influenced by the crust. A number of the highest stratovolcanoes in the world are in the CVZ. Historical activity has been low in comparison to the volcanic zones of southern Chile and Colombia/Ecuador. In Chile, much of the area of the CVZ is desertic and thus difficult to research.A number of stratovolcanoes can be found in the area, many of which were affected by explosive eruptions that have destroyed parts of their edifices. Effusion of large amounts of lava took place from several cones. Many volcanoes are extinct and only a few have documented activity. The geologist Juan Brüggen in 1950 estimated that there were about 800 volcanoes in northern Chile, about 37 of them east of the Salar de Atacama. Also part of the volcanism are large ignimbrites, which are usually thought to be of Miocene age. Those in the area of Sairecabur often originated in the neighbourhood to the conical volcanoes. The volcanoes formed over crust with thicknesses reaching
Sairecabur is constructed on the two Pliocene-Pleistocene Puripicar and Chaxas formations. Some lavas from Sairecabur have also overrun the Purico formation,which is of Pleistocene age and includes ignimbrites from the Purico Complex. The basement beneath Sairecabur and Licancabur contains a large number of faults.
Sairecabur is located at a distance of 25 kilometres (16 mi) from San Pedro de Atacama. The volcano saddles the frontier between Bolivia and Chile, where it lies in the Antofagasta Region. Laguna Verde lake, Licancabur volcano and Portezuelo de Chaxas pass lie south of Sairecabur. East of the Sairecabur range lie Mount Nelly and Cerro Laguna Verde.
The Treaty of Peace and Friendship (1904) traced the frontier between Bolivia and Chile along the Sairecabur chain.Disagreements between the topographic maps in the two countries mean that the naming of the mountains is often confusing. Escalante is also known as Apagado.
The volcano is associated with a mountain range of the same name. 3,950 metres (12,960 ft), it later converges with the Rio Puritama to form the San Pedro de Atacama River.The Sairecabur range forms a drainage divide between the Salar de Atacama on the western side and a number of small endorheic basins in Bolivia on the eastern side. Licancabur and Juriques farther south and Tocorpuri farther north are part of the same divide. Dry valleys on the eastern side of the Sairecabur range ultimately drain into Laguna Verde. The Rio Purifica originates on Sairecabur's slope at an altitude of
The Sairecabur range is a 22-kilometre (14 mi) long chain of volcanoes going from Escalante volcano (south of Putana Volcano) to Sairecabur proper in the south, including at least ten centres which have been active in postglacial time. Two additional centres exist northeast of Escalante.
5,971-metre (19,590 ft) high Sairecabur is the highest volcano in the range. A 4.5-kilometre (2.8 mi) wide caldera exists south of Sairecabur and formed on an older volcano. Lava flows extend from Sairecabur as far as 2.5 kilometres (1.6 mi) to the northwest, and further young lava flows formed south of this caldera. The 5,819-metre (19,091 ft) high Escalante ( ) has a crater lake. Puritama volcano west of Sairecabur has generated 16 kilometres (9.9 mi) lava flows that extend along tectonic canyons. 5,722-metre (18,773 ft) high Curiquinca ( ) and 5,748-metre (18,858 ft) high Cerro Colorado ( ) are found northwest and northeast, respectively, of the range.
The caldera is bounded by cliffs reaching a height of 400 metres (1,300 ft), which are buried by lava flows from Sairecabur on the northern rim; one of these lava flows reaches the caldera bottom. The pre-collapse volcano was about 7,000 metres (23,000 ft) high and would have been one of the highest volcanoes in the world; Ojos del Salado reaches an altitude of 6,885 metres (22,589 ft). Sairecabur proper has three cones. Thick (10 metres (33 ft)) and short lava flows emanated from the northern cone. Glacial erosion has affected Sairecabur and moraines cover some lava flows south of Sairecabur. The total volume of the Sairecabur proper is about 35 cubic kilometres (8.4 cu mi).
Lava flows with a young appearance extend from each of these ten centres. An older centre has generated a 30 kilometres (19 mi) long lava flow that flowed southwestwards. Some older lava flows from Sairecabur were later buried by lava flows from Licancabur.
Cerro Colorado and Curiquinca are aligned in a west-east pattern. Other volcanoes in the area such as Lascar-Aguas Calientes, Licancabur-Juriques and La Torta-Tocorpuri also form such alignments which seem to be controlled by north-south tension in the crust.Sairecabur is located on faults which are also apparent at Laguna Verde.
Escalante and Sairecabur have erupted dark andesites, and later also dacites.Mafic enclaves are found in the post-caldera lavas. The colour of the rocks is black, brown or gray. Minerals include amphibole, biotite, bronzite, Ca-containing augite, clinopyroxene, hornblende, magnetite, orthopyroxene, plagioclase, pyroxene and quartz. In addition, apatite, ilmenite, iron oxides and zirconia are found. At least one lava erupted after the caldera-forming eruption contains olivine. Lavas erupted before the caldera-forming eruption of Sairecabur contain glass and have a microlithic texture. The magmas are calc-alkaline with medium-high K content.
Fumarolically altered rocks are found on the eastern flanks of the chain.Desert patine covers post-caldera lavas.
Based on crystal composition, the magmas of Sairecabur formed at temperatures of 850–950 °C (1,560–1,740 °F). The process started by partial melting of the mantle involving peridotite and subsequent interaction with the crust and fractional crystallization. Andesites erupted before the caldera formation were produced at temperatures 90 °C (160 °F) higher than dacites erupted after the formation of the caldera. O, Pb and Sr isotope ratios are typical for magmas in CVZ. The Pb isotope ratios are consistent with these found in the crust, specifically of the so-called "Antofalla" domain of Andean crust, the remnant of a terrane of Gondwana.
The 7 million year-old Chaxas ignimbrite massif has been related to the caldera-forming eruption at Sairecabur. These dacitic ignimbrites spread southwest towards the Salar de Atacama.This high age estimate for the Chaxas ignimbrite however has been questioned, considering that it is inconsistent with stratigraphic relationships of this ignimbrite to older ignimbrite. The lava formations are named Post-Caldera Lavas I and Post-Caldera Lavas II; the first is of Pleistocene and the second of Holocene age. A fresh flow that extends northwest from Sairecabur appears to be the most recent flow.
The formation of the caldera preceded the formation of the other cones in the range. 8-kilometre (5.0 mi) long glacier that extended down to an elevation of 4,600 metres (15,100 ft); the main Sairecabur summit grew inside of the valley occupied by the glacier, which also left lateral and terminal moraines.The edifice this caldera formed during the Pliocene-Quaternary considering the morphology of its deposits. During the ice ages, a valley due west of the main Sairecabur summit was occupied by a
Sairecabur volcano is the youngest volcano in the chain; Escalante is also young but not as young as Sairecabur. There are no reports of contemporaneous activity nor has fumarolic activity been reported,although fumaroles and hot springs were found at the shores of Laguna Verde which border on Sairecabur. Future activity at Sairecabur may disturb activity at Atacama Large Millimeter Array.
The climate at Sairecabur is dry and cloudless, 200 millimetres per year (7.9 in/year), but during the late Pleistocene and early Holocene the climate was wetter. T isotope ratios of present-day snowfall are consistent with the isotope ratios determined for precipitation that arises in the continent, rather than from the Pacific Ocean. The rainshadow effect exercised by the Andes and the stability of the South Pacific High are responsible for this dryness.leading to the absence of glaciers and permanent snowcover at Sairecabur. Overall the Atacama Altiplano has a desert climate with precipitation below
The dry and cloudless climate together with the low latitude and high altitude gives the region some of the highest insolations on Earth; at Sairecabur it amounts to 98% of the solar constant. 15.6–36.4 watts per square metre (0.00194–0.00453 hp/sq ft) reported for ultraviolet radiation B and ultraviolet radiation A respectively.The coincidence between the southern hemisphere summer solstice on 21 December and the perihelion, the point of lowest Earth-Sun distance, on 3 January contribute to the high insolation. Ultraviolet radiation is also high in the area, with values
Temperatures at 5,820 metres (19,090 ft) ranged −8.7 – −16.3 °C (16.3–2.7 °F) in 1991–1994. A series of measurements in 1995 indicated that surface temperatures at an altitude of 5,820 metres (19,090 ft) range from −20–20 °C (−4–68 °F) in winter, and soil temperatures at depths of 5 centimetres (2.0 in) also in winter between almost 10 °C (50 °F) and less than −10 °C (14 °F). There are large differences between daytime and night temperatures. Between 1991–1994 the average speed of wind amounted to 5–11 metres per second (16–36 ft/s).
Research on plant diversity in the region west of Sairecabur and Licancabur has shown that about 250 plant species occur there,and on the volcano itself extremophilic yeast species have been found. In 1955, penitentes, a form of ice, was reported to be widespread at Saciel.
Sairecabur and Curiquinca both have mountain sanctuaries made by the Inca. Licancabur and Juriques farther south were also sites of such sanctuaries.Sairecabur was considered to be a sacred mountain, and andesite found at some archeological sites in the Atacama may come from Sairecabur.
A sulfur mine is active at Saciel, north of Sairecabur. 600,000 tonnes (590,000 long tons; 660,000 short tons) ore containing 55–60% sulfur. A 21-kilometre (13 mi) long mining dirt road with a single lane leads from the El Tatio highway to Sairecabur.Sulfur mining there, at Cerro Colorado and Putana in the 1950s contributed to the growth of San Pedro de Atacama, where the mined sulfur was transported to. A report in 1955 indicated the presence of about
Sairecabur is since 2003 the site of the 0.8-metre (2 ft 7 in) diameter Receiver Lab Telescope, a telescope which operates in the terahertz range of the electromagnetic spectrum; ground-based astronomy in this range was long considered to be impossible since the atmosphere absorbs radiation in that frequency range heavily. With an altitude of 5,525 metres (18,127 ft) the telescope is the highest submillimeter telescope in the world.
Sierra Nevada, also known as Sierra Nevada de Lagunas Bravas, is a major ignimbrite-lava dome complex which lies in both Chile and Argentina in one of the most remote parts of the Central Andes. Activity in the complex started in Argentina and formed two stratovolcanoes. Later, 12 or more vents formed, some with craters up to 400 metres (1,300 ft) wide. Lava flows up to 7 kilometres (4.3 mi) long with flow ridges are also found. It covers a total area of 225 km². Radiometric dating has yielded ages of 1.7 ± 0.4 to 0.431 ± 0.012 million years ago. Together with Cerro el Condor and Peinado it forms the Culampaja line, a line of volcanoes that reaches Cerro Blanco. Strong seismic attenuation is observed beneath Sierra Nevada. Hydrothermally altered rocks in Sierra Nevada may be the source of sulfate and As in the Juncalito and Negro rivers.
Licancabur is a stratovolcano on the border between Bolivia and Chile, south of the Sairecabur volcano and west of Juriques. Part of the Andean Central Volcanic Zone, it has a prominent, 5,916-metre (19,409 ft)-high cone. A 400-metre (1,300 ft) summit crater containing Licancabur Lake, a crater lake which is among the highest lakes in the world, caps the volcano. Three stages of lava flow emanate from the volcano, which formed on Pleistocene ignimbrites.
Incahuasi is a volcanic mountain in the Andes of South America. It lies on the border of the Argentine province of Catamarca, and the Atacama Region of Chile. Incahuasi has a summit elevation of 6,621 metres (21,722 ft) above sea level.
Cerro Galán is a caldera in the Catamarca Province of Argentina. It is one of the largest exposed calderas in the world. It is part of the Central Volcanic Zone of the Andes, one out of several volcanic belts found in South America. It is one of several major caldera systems in the Central Volcanic Zone, some of which are grouped into the Altiplano–Puna volcanic complex.
Ollagüe or Ullawi is a massive andesite stratovolcano in the Andes on the border between Bolivia and Chile, within the Antofagasta Region of Chile and the Potosi Department of Bolivia. Part of the Central Volcanic Zone of the Andes, its highest summit is 5,868 metres (19,252 ft) above sea level and features a summit crater that opens to the south. The western rim of the summit crater is formed by a compound of lava domes, the youngest of which features a vigorous fumarole that is visible from afar.
The Purico complex is a Pleistocene volcanic complex in Chile close to Bolivia, formed by an ignimbrite, several lava domes and stratovolcanoes and one maar. It is one of the Chilean volcanoes of the Andes, and more specifically the Chilean segment of the Central Volcanic Zone, one of the four volcanic belts which make up the Andean Volcanic Belt. The Central Volcanic Zone spans Peru, Bolivia, Chile and Argentina and includes 44 active volcanoes as well as the Altiplano-Puna volcanic complex, a system of large calderas and ignimbrites of which Purico is a member of. Licancabur to the north, La Pacana southeast and Guayaques to the east are separate volcanic systems.
Putana, sometimes referred to as Jorqencal or Machuca, is a volcano on the border between Bolivia and Chile and close to the Sairecabur volcanic complex. Part of the Central Volcanic Zone of the Andes, its summit is 5,890 metres (19,320 ft) above sea level and contains a summit crater with two smaller craters nested within it. Beneath the summit, the volcano features a number of lava domes and lava flows, some of which originated in flank vents.
La Pacana is a Miocene age caldera in northern Chile's Antofagasta Region. Part of the Central Volcanic Zone of the Andes, it is part of the Altiplano-Puna volcanic complex, a major caldera and silicic ignimbrite volcanic field. This volcanic field is located in remote regions at the Zapaleri tripoint between Chile, Bolivia and Argentina.
Aguas Calientes is a major Quaternary caldera in Salta Province, Argentina. It is in the Central Volcanic Zone of the Andes, a zone of volcanism covering southern Peru, Bolivia, northwest Argentina and northern Chile. This zone contains stratovolcanoes and calderas.
Cerro Blanco is a caldera in the Andes of the Catamarca Province in Argentina. Part of the Central Volcanic Zone of the Andes, it is a volcano collapse structure located at an altitude of 4,670 metres (15,320 ft) in a depression. The caldera is associated with a less well defined caldera to the south and several lava domes.
Cerro Guacha is a Miocene caldera in southwestern Bolivia's Sur Lípez Province. Part of the volcanic system of the Andes, it is considered to be part of the Central Volcanic Zone (CVZ), one of the three volcanic arcs of the Andes, and its associated Altiplano-Puna volcanic complex (APVC). A number of volcanic calderas occur within the latter.
Panizos is a Late Miocene era caldera in the Potosí Department of Bolivia and the Jujuy Province of Argentina. It is part of the Altiplano-Puna volcanic complex of the Central Volcanic Zone in the Andes. 50 volcanoes active in recent times are found in the Central Volcanic Zone, and several major caldera complexes are situated in the area. The caldera is located in a logistically difficult area of the Andes.
Incapillo is a Pleistocene caldera, a depression formed by the collapse of a volcano, in the La Rioja province of Argentina. Part of the Argentine Andes, it is considered the southernmost volcanic centre in the Central Volcanic Zone of the Andes with Pleistocene activity. Incapillo is one of several ignimbritic or calderic systems that, along with 44 active stratovolcanoes, are part of the Central Volcanic Zone.
Irruputuncu is a volcano in the commune of Pica, Tamarugal Province, Tarapacá Region, Chile, as well as San Pedro de Quemes Municipality, Nor Lípez Province, Potosí Department, Bolivia. The mountain's summit is 5,163 m (16,939 ft) high and has two summit craters—the southernmost 200 m (660 ft)-wide one has active fumaroles. The volcano also features lava flows, block and ash flows and several lava domes. The volcano is part of the Andean Central Volcanic Zone (CVZ).
Jotabeche is a Miocene-Pliocene caldera in the Atacama Region of Chile. It is part of the volcanic Andes, more specifically of the extreme southern end of the Central Volcanic Zone (CVZ). This sector of the Andean Volcanic Belt contains about 44 volcanic centres and numerous more minor volcanic systems, as well as some caldera and ignimbrite systems. Jotabeche is located in a now inactive segment of the CVZ, the Maricunga Belt.
Laguna Amarga is a caldera and associated ignimbrite in the Andes of northwestern Argentina.
Acamarachi is a 6,046-metre (19,836 ft) high volcano in northern Chile. In this part of Chile, it is the highest volcano. Its name means "black moon". It is a volcano in the Central Volcanic Zone of the Andes, a zone of strong volcanic activity during the last million years. Old volcanoes in the area are well-preserved, due to the dry climate.
Negra Muerta is a caldera in Argentina. It is part of the volcanic centres of the Andean Volcanic Belt, which has formed a number of calderas in large ignimbrite producing eruptions. These calderas include Aguas Calientes, Cerro Panizos, Galan, Negra Muerta and La Pacana. Some of these volcanic centres appear to be associated with large fault zones that cross the Puna.
Toconce is a volcano in Chile.
Wheelwright caldera is a caldera in Chile. It is variously described as being between 11 kilometres (6.8 mi) and 22 kilometres (14 mi) wide and lies in the Central Volcanic Zone of the Andes. A lake lies within the caldera, which is among the largest of the Central Andes. The caldera lies in the region of Ojos del Salado, the world's tallest volcano.