Socompa

Short description: Mountain in Argentina

Socompa

Socompa as seen from near the Salar de Imilac.

Highest point
Elevation| 6,051 m (19,852 ft) [1]
Prominence| 2,015 m (6,611 ft) [1]
Parent peak| Ojos del Salado
Listing| Ultra,
Coordinates|  [ ⚑ ] : 24°23′45.24″S 068°14′45.59″W﻿ / ﻿24.3959°S 68.2459972°W﻿ / -24.3959; -68.2459972 [1][2]
Geography

Socompa

Location in Argentina, on the border with Chile

Location| Argentina – Chile
Parent range| Andes
Geology
Mountain type| Stratovolcano
Last eruption| 5250 BCE (?)
Climbing
First ascent| 1908 - Friedrich Reichert (Germany)[3][4]
Easiest route| glacier/snow

Socompa is a large stratovolcano at the border of Argentina and Chile with an elevation of 6,051 metres (19,852 ft) metres. Part of the Chilean and Argentine Andean Volcanic Belt (AVB), it is part of the Central Volcanic Zone, one of the various segments of the AVB. This part of the Andean volcanic arc begins in Peru and runs first through Bolivia and Chile, and then through Argentina and Chile, and contains about 44 active volcanoes. Socompa lies close to the pass of the same name, where the Salta-Antofagasta railway crosses the border.

Socompa is known for its large debris avalanche, which was formed 7,200 years ago when most of the northwestern slope collapsed and slid down, forming an extensive deposit. It was at first considered to be either a moraine or a nuee ardende deposit, until the 1980 eruption of Mount St. Helens prompted awareness of the instability of volcanic edifices and the existence of large scale collapses on them. The Socompa collapse is among the largest known with a volume of 19.2 cubic kilometres (4.6 cu mi) and covers a surface area of 490 square kilometres (190 sq mi), and its features are well preserved by the arid climate. Notable are the large toreva blocks which were left behind within the collapse crater. After the landslide, the volcano was rebuilt by the effusion of lava flows and much of the scar is now filled in.

Socompa is also noteworthy for the high-altitude biotic communities that are bound to fumaroles on the mountain and form well above the regular vegetation in the region. The climate on the mountain is cold and dry.

## Contents

* 1 Geography and geomorphology
* 1.1 Sector collapse
* 1.1.1 Landslide deposit
* 2 Geology
* 2.1 Regional
* 2.2 Local
* 2.3 Basement
* 2.4 Composition
* 3 Climate and ecology
* 4 Eruptive history
* 5 See also
* 6 Notes
* 7 References
* 8 References
* 9 External links

## Geography and geomorphology

Socompa is situated on the border between Argentina and Chile ,[5] due east of Monturaqui.[6] The Salta–Antofagasta railway[lower-alpha 1][8] crosses the border between the two countries just below Socompa, rendering the volcano easily accessible despite its remote location.[9] The same pass was an important route between the two countries and reportedly between 1940 and 1970 the Carabineros de Chile had a post there.[10] Rails and roads at Socompa go up to an elevation of 3,860 metres (12,660 ft); from there the volcano can be climbed from its southern, eastern and northern flank.[11][12] The mountain is considered to be an apu by the local population, and Inca constructions have been reported either from its slopes[13][14] or from its summit.[15][14] The name comes from the Kunza language and may be related to socke and sokor, which mean "spring" or "arm of water".[16]

The volcano is part of the Central Volcanic Zone, one of the four volcanic zones of the Andean Volcanic Belt. The Central Volcanic Zone spans Peru, Bolivia, Chile and Argentina and contains about 44 active volcanoes, plus a number of monogenetic volcanoes and silicic caldera volcanoes. A number of older inactive volcanoes are well preserved owing to the dry climate of the region. Many of these systems are in remote regions and thus are poorly studied but pose little threat to humans. The largest historical eruption in the Central Volcanic Zone occurred in 1600 at Huaynaputina in Peru, and the recently most active volcano is Lascar in Chile.[17]

Socompa is a 6,051-metre (19,852 ft) high[lower-alpha 2][lower-alpha 3][26] composite volcano[5] consisting of a central cone and several lava domes;[27] it is the most voluminous conical volcano of the Central Volcanic Zone[28] and one of the highest edifices there, rising more than 2 kilometres (1.2 mi) above the surrounding terrain.[29] Several dacitic lava flows form the summit area of the volcano, the youngest of which originates in a summit dome. This summit dome is capped off by a summit crater at an altitude of 5,850 metres (19,190 ft),[30] and four additional craters occur northeast of the summit at altitudes of 5,600 to 5,800 metres (18,400–19,000 ft).[31] Northwest of the summit, a dacitic lava dome is the source of a 500-metre (1,600 ft) high talus slope. [30] The summit area is surrounded by an inwards-dropping scarp that opens to the northwest and whose southern margin is buried by lava flows. Pyroclastic flows crop out beneath lava flows in the northwestern segment of the volcano, within the scarp. On the southern and eastern side the scarp is 5 kilometres (3.1 mi) long and 200–400 metres (660–1,310 ft) high,[26] while the southern side is about 9 kilometres (5.6 mi) long.[30] A large wedge-shaped scar is recognizable on the northwestern flank,[32] delimited by prominent scarps running through the western and northern flanks of the edifice.[33] The existence of a lake in the summit area within the scarps at elevations of 5,300 metres (17,400 ft) has been reported.[18]

On the northeastern flank a pumice deposit is clearly visible.[26] Lava domes have various shapes[34] and are recognizable in the southern and western slopes, while lava flows appear mainly on the eastern and northern slopes. The whole edifice has a diameter of 16 kilometres (9.9 mi) and, like many Central Andes volcanoes, probably originally consisted of lava domes, lava flows and various pyroclastic formations.[26] Its volume is about 102 cubic kilometres (24 cu mi), making Socompa one of the largest stratovolcanoes with Quaternary activity.[35] The volcano apparently developed within a northwest-striking valley, the southern part of which now contains Laguna Socompa. This lake lies at an elevation of 3,400 metres (11,200 ft); to the north the volcano is bordered by the 3,200-metre (10,500 ft) high Monturaqui basin.[6] A water table exists at depths of 100–200 metres (330–660 ft), but surface runoff is only ephemeral.[36] Magnetotelluric investigation has identified a structure at 2–7 kilometres (1.2–4.3 mi) depth[37] that may be Socompa's magma chamber.[38]

### Sector collapse

Socompa suffered a major sector collapse during the Holocene,[5] forming one of the largest terrestrial collapse deposits.[39] The deposit left by the collapse was first discovered on aerial photography in 1978 but the correct interpretation as a landslide occurred in 1985;[27] at first it was interpreted as a form of moraine,[40] then as a large pyroclastic flow[41] and the collapse scar as a caldera.[42]

The collapse removed about 70° (about 12 kilometres (7.5 mi)[43]) of Socompa's circumference on its northwestern side, descended over a vertical distance of about 3,000 metres (9,800 ft) and redeposited it over distances of over 40 kilometres (25 mi),[27] at a modelled speed of c. 100 metres per second (220 mph).[44] As it descended, the collapse landslide accumulated sufficient energy that it was able to override topographic obstacles and climb an elevation of about 250 metres (820 ft); secondary landslides occurred on the principal deposit[43] and there is evidence that the landslide was reflected back from its margins.[45] The collapse occurred in several steps, with the first parts to fail ending up at the largest distances from the volcano;[46] it is not established whether the collapse happened in a single event or as several separate failures.[47] The total volume of material removed was about 19.2 cubic kilometres (4.6 cu mi), which was dilated as it flowed and eventually ended up as a deposit with a volume of 25.7 cubic kilometres (6.2 cu mi);[48] thorough mixing of the avalanche material occurred as the landslide progressed.[49] The summit of the volcano was cut by the collapse and some lava domes embedded within the volcano were exposed in the rim of the collapse amphitheatre;[26] before the collapse the volcano was about 6,300 metres (20,700 ft) high.[50]

The collapse left a triangle-shaped collapse scar,[29] which was partly filled by blocks left over by the collapse. The walls of the amphitheatre were about 2,000 metres (6,600 ft) high, so high that secondary landslides occurred. The largest of these detached from a dome northwest of the summit and descended a horizontal distance of 6 kilometres (3.7 mi), forming a landslide structure notable in its own right and covering about 12 square kilometres (4.6 sq mi).[51] The central section of the collapse amphitheatre was not a simple collapse structure, but instead contained a secondary scarp.[43] At the mouth of the collapse scar, the walls were lower, about 300 metres (980 ft).[52] After the principal collapse, lava flows and pyroclastic flows – some of which emerge from the western rim of the collapse scar – filled up the scar left by the collapse.[27] A structure named Domo del Núcleo in the scar may either be a remnant of the pre-collapse volcano, or collapse debris.[29]

A similar collapse was observed in the 1980 eruption of Mount St. Helens.[5] In fact, the occurrence of a large landslide at Mount St. Helens probably aided in the subsequent identification of the Socompa deposit as a landslide remnant.[53] Other volcanoes have suffered from large scale collapses as well; this includes Aucanquilcha, Lastarria and Llullaillaco.[54] In the case of Socompa, the occurrence of the collapse was probably influenced by a northwest tilt of the basement the volcano was constructed on; it caused the volcano to slide downward in its northwestern sector and made it prone to a collapse in that direction.[55]

The collapse happened about 6180+280
−640 years ago,[56] it was not witnessed in historical records.[5] This event probably lasted only 12 minutes based on simulations.[41] The growth rate of the volcano increased after the collapse, probably due to the mass removal unloading the magmatic system.[57]

There is evidence in the collapse deposit that a lava flow was being erupted on the volcano when the landslide occurred,[58] which together with the presence of pyroclastic fallout on the southwestern side of Socompa implies the collapse may have been started by volcanic activity. The quantity of water in the edifice rocks on the other hand was probably minor.[59][60] Another theory assumes that the volcanic edifice was destabilized by ductile and mechanically weak layers beneath Socompa; under the weight of the volcano these layers can deform and "flow" outward from the edifice, causing the formation of thrusts at its foot.[61] Evidence of such spreading of the basement under Socompa has been found.[62]

The collapse generated a large amount of energy, about 380 petajoules (1.1×1011 kWh).[48] Some evidence in the form of tephra suggests that the collapse was accompanied by a lateral blast,[63] but other research found no such evidence.[33] Such sector collapse events are catastrophic phenomena, and the debris avalanches associated with them can reach large distances from the original volcano.[64] The fragmentation of rocks during the landslide and the fine material generated during this process might enhance the fluidity of the avalanche, allowing it to extend far away from the source.[54]

#### Landslide deposit

Socompa from space, the sector collapse deposit lies on the upper side

The collapse deposit covers a surface area of 490 square kilometres (190 sq mi),[27] and is thus not as large as the deposit left by the Mount Shasta collapse[5] or by the Nevado de Colima collapse.[65] It forms the Negros de Aras surface northwest of the volcano and the El Cenizal surface due north where it has a hook-like surface distribution;[66] the name "Negros de Aras" was given to the deposit before it was known that it had been formed by a landslide.[67] The thickness of the deposit varies, with thin segments in the extreme southeastern and southwestern parts being less than 10 metres (33 ft) thick and the central parts reaching 90 metres (300 ft).[68]

The deposit spreads to a maximum width of 20 kilometres (12 mi) and is bounded by levees higher than 40 metres (130 ft), which are less prominent on the eastern side.[67] As later parts of the collapse overrode the earlier segments, they formed a northeast-trending scarp in the deposit, across which there is a striking difference in the surface morphology of the collapse.[69] The landslide deposit has been stratigraphically subdivided into two units, the Monturaqui unit and the El Cenizal unit. The first unit forms most of the surface and consists itself of several subunits, one of which includes basement rocks that were integrated into the collapse as it occurred.[58] Likewise, the El Cenizal unit included basement rocks as well, such as playa deposits.[70] The amount of basement material is noticeably large and might form as much as 80% of the landslide volume;[41] the topography of the northwestern side of the volcano may have prevented the mass failure from being localized along the basement-edifice surface area, explaining the large volume of basement involved.[71] Further, the basement-derived material was probably mechanically weak and thus allowed the landslide to move over shallow slopes.[72] This basement material forms part of the white surfaces in the landslide deposit; other bright areas are formed by fumarolically altered material.[73] The basement material was originally considered to be pumice.[52]

The landslide deposit contains large blocks, so called toreva blocks, which were torn from the mountain and came to a standstill unmodified, forming ridges up to several 100 metres (330 ft) high;[58] the largest such blocks are 2.5 kilometres (1.6 mi) long and 1 kilometre (0.62 mi) wide[43] and their total volume is about 11 cubic kilometres (2.6 cu mi).[72] These blocks form an almost closed semicircle at the mouth of the collapse amphitheatre and in part retain the previous stratigraphy of the volcano.[74] Such toreva blocks are far more frequent in submarine landslides than subaerial ones and their occurrence at Socompa may reflect the relatively non-explosive nature of the collapse and material properties of the collapsed mass.[71] Aside from the toreva blocks, individual blocks with sizes of up to 25 metres (82 ft) occur in the deposit and form large boulder fields. In addition to the blocks, the surface of the landslide deposit contains hummock-like hills and small topographic depressions.[43] Part of the landslide deposit was later covered by pyroclastic flows, and this covered area is known as the Campo Amarillo. As it descended, the landslide deposit filled a shallow valley that previously existed northwest of the volcano,[27] as well as a larger northeast-striking depression.[72] A lava flow was rafted on the avalanche to the El Cenizal area and ended up there almost unmodified.[75]

The collapse deposit is well preserved by the arid climate, among the best preserved such deposits in the world.[5] However, because of its sheer size[27] its structure and stratigraphy were only appreciated with the help of remote sensing.[5] Pleistocene lava flows and a northwest-striking drainage were buried by the landslide but can still be discerned from aerial imagery; apart from these and some hills most of the area covered by the landslide was relatively flat.[68] At La Flexura, part of the basement beneath the avalanche crops out from the ground.[41]

## Geology

Socompa as seen from nearby railway station Socompa

### Regional

Volcanism in the Central Volcanic Zone of the Andes is caused by the subduction of the Nazca Plate beneath the South America Plate in the Peru-Chile Trench at a rate of 7–9 centimetres per year (2.8–3.5 in/year). It does not cause volcanism among the entire length of the trench; where the slab is subducting beneath the South America Plate at a shallow angle there is no recent volcanic activity.[17]

The style of subduction has changed over time. About 27 million years ago, the Farallon Plate which hitherto had been subducting beneath South America broke up and the pace of subduction increased, causing increased volcanism. Around the same time, after the Eocene, the subduction angle increased beneath the Altiplano and caused the development of this plateau either from magmatic underplating and/or from crustal shortening; eventually the crust there became much thicker.[17]

### Local

El Negrillar volcano just north of Socompa; the white area to the right is part of the Socompa landslide deposit

Socompa forms a northeast-trending alignment with neighbouring volcanoes such as Pular and Pajonales, which reach elevations of about 6,000 metres (20,000 ft);[27] Socompa is their youngest member.[76] The presence of two calderas southeast and east of Socompa has been inferred.[77] Monogenetic volcanoes were active in the area as well during the Pliocene and Quaternary and generated lava flows.[78] One of these centres is El Negrillar just north of the collapse deposit,[79] which was active during the Pleistocene and formed andesite-basaltic andesite lavas unlike the eruption products of Socompa itself.[80]

A 200-kilometre (120 mi) long lineament known as the Socompa Lineament is associated with the volcano. Other volcanoes such as Cordon de Puntas Negras and the rim of the large La Pacana caldera farther north are also influenced by this lineament.[81] A north-south trending lineament called the Llullaillaco Lineament is also linked to Socompa and to the Mellado volcano farther south.[77]

To the west Socompa is bordered by the Sierra de Alameida (or Almeida), which farther north merges into the Cordon de Lila. To the east the 6,000-metre (20,000 ft) high Salín volcano neighbours Socompa;[6] other volcanoes in the area are the 5,340-metre (17,520 ft) high Cerro Bayo and the 5,200-metre (17,100 ft) high Socompa Cairis[lower-alpha 4], all of which show evidence of glacial activity unlike the younger Socompa.[83]

### Basement

A spaceborne image of the region northwest of Socompa, which is recognizable in the lower right tip

The basement at Socompa is formed by Paleozoic and Mesozoic formations and by Quaternary sedimentary and volcanic rocks. The former crop out in the Sierra de Alameida and Alto del Inca west of Socompa and the latter as the 250-metre (820 ft) thick Quebrada Salin Beds east of the volcano. Part of these beds were taken up into the avalanche as it collapsed and form the Flexura inliner,[79] others appear in the Loma del Inca area north and the Monturaqui area due west of Socompa.[66] The basement rocks are subdivided into three named formations, the Purilactus Formation of Paleozoic-Mesozoic age, the San Pedro and Tambores formations of Oligocene-Miocene age and the Miocene-Pliocene Salin formation;[36] part of the latter formation may have been erupted by Socompa itself.[80] The volcano is situated at the point where the Sierra de Alameida meets the Puna block.[6]

During the Pliocene this basement was covered by the Arenosa and Tucucaro ignimbrites (2.5 and 3.2 million years ago by potassium-argon dating, respectively[36]) which also crop out west of Socompa; Socompa is probably constructed on top of these ignimbrites.[78] The Arenosa ignimbrite is about 30 metres (98 ft) thick while the Tucucaro reaches a thickness of 5 metres (16 ft).[36]

Some normal faults appear in the area north of Socompa and appear to run through the edifice. While they are not visible in the edifice itself, Socompa was uplifted on its southeastern side by the fault motion.[26] This might have aided in the onset of edifice instability and the collapse event.[60] In addition, directly north-northwest of Socompa lie three anticlines probably formed under the influence of the mass of both Socompa and Pajonales: The Loma del Inca, Loma Alta and La Flexura.[61]

### Composition

Socompa has erupted andesite and dacite,[27] with dacite dominating.[9] Phenocrysts found in the rocks of the avalanche include the minerals augite, hornblende, hypersthene, magnetite and plagioclase;[84] dacites also contain biotite while andesites also contain olivine.[9] In the summit area, hydrothermal alteration took place[85] and clay, silt and sulfur bearing rocks are also found.[18]

## Climate and ecology

There are few data on climate at Socompa. The area is windy and dry given that the volcano lies in the Desert Puna, with frequent snow cover [18] and penitentes[86] but no glaciers. The relatively low cloud cover means that insolation is high.[18] Weather data collected in 1991 found an average temperature of −5.5 °C (22.1 °F), a large diurnal air temperature cycle (and a larger soil temperature cycle of c.60 – −10 °C (140–14 °F) [87]) and low evaporation.[88] The present-day precipitation has been estimated to be 400 millimetres per year (16 in/year),[89] with other estimates assuming less than 200 millimetres per year (7.9 in/year).[90] Periglacial landforms indicate that in the past the area was wetter, possibly thanks to the Little Ice Age.[12] There is, however, no evidence for Pleistocene glaciation including no cirques, which may be due to the volcano's young age.[91]

Socompa features autotrophic communities associated with fumaroles and thermal anomalies at high altitude, between 5,750–6,050 metres (18,860–19,850 ft) of elevation.[92] The autotrophic communities on Socompa are the highest known in the world,[93] and they occur both on the actual fumaroles and on "cold fumaroles".[94] The various species are often extremophiles since the environment on Socompa is harsh,[95] and the communities also include heterotrophic species.[96] Such heterotrophs include ascomycota and basidiomycota, the latter of which have noticeable similarity to Antarctic basidiomycota.[97]

The fumaroles on Socompa also feature stands of bryophytes such as liverworts and mosses[lower-alpha 5] as well as lichens and algae, and animals have been found in the stands.[99][100] These stands are among the highest in the world and cover noticeably large surface areas despite their elevation,[18] and are fairly remote from other plant life in the region.[93] There is a noticeable diversity between separate stands, and the vegetation is quite dissimilar to the vegetation in the surroundings but resembles that found in the paramo and cloud forests in South America and the subantarctic islands.[101] A sparse vegetation cover is also found on the lower slopes of Socompa.[102] The black-headed lizard and its relative Liolaemus porosus live on its slopes,[103] and mice have been observed in the summit area.[104]

## Eruptive history

Activity at Socompa commenced with the extrusion of andesites, which were followed later by dacites.[105] Several Plinian eruptions have occurred on Socompa.[27] Several dates have been obtained on Socompa rocks, including 2,000,000 ± 1,000,000, 1,300,000 ± 500,000, 800,000 ± 300,000 and less than 500,000 years ago.[106] An age of 3,340,000 ± 600,000 years may be of an older volcano, now buried beneath the Socompa edifice.[107] Lava domes and lava flows on the southern side of the volcano have yielded ages of 69,200 ± 6,000, 31,400 ± 3,200, 29,800 ± 3,300 and 22,100 ± 1,900 years ago.[108] After the sector collapse 7,200 years ago, activity continued filling the collapse scar. The explosion craters on the summit are the youngest volcanic landforms on Socompa,[9] one dome in the scar has been dated to 5,910 ± 430 years ago.[108] An eruption 7,220 ± 100 years before present produced the El Túnel pyroclastic deposit on the western side of Socompa.[109] The youngest eruption was dated to have occurred 5,250 years before present.[80][lower-alpha 6]

The absence of moraines on Socompa suggests that volcanic activity occurred during the post-glacial time.[27] The volcano also has a young appearance, similar to historically active Andean volcanoes such as San Pedro, implying recent volcanic activity.[53]

There is no evidence for historical activity at Socompa[53] and the volcano is not considered an active volcano,[90] but both fumarolic activity and the emission of CO2 have been observed.[111] The fumarolic activity occurs at at least six sites[112] and is relatively weak;[90] anecdotal reports indicate a smell of sulfur on the summit.[9] Ongoing uplift of the edifice began in[35] November 2019 and is ongoing (As of October 2021),[113] and could be caused by the arrival of new magma.[114] (As of 2023) there is no ground-based monitoring of the volcano.[113] Socompa is considered to be Argentina's 13th most dangerous volcano out of 38.[115] Apart from the Socompa railway station and mining camps west of the volcano, there is little infrastructure that could be impacted by future eruptions. Large explosive eruptions during summer may result in pyroclastic fallout west of the volcano, while during the other seasons fallout would be concentrated east of it.[76]

Groundwater is warmer and richer in CO2 the closer to Socompa it is pumped, also suggesting that volcanic gas fluxes still occur at the volcano[116] and that the volcano influences groundwater systems.[117] Hot springs are found at Laguna Socompa as well.[118] In 2011, the Chilean mining company Escondida Mining was considering building a geothermal power plant on Socompa to supply energy;[119] the Argentine Servicio Geológico Minero agency started exploration work in January 2018 for geothermal power production.[120]

## See also

* List of volcanoes in Argentina
* List of volcanoes in Chile
* List of Ultras of South America

## Notes

1. ↑ On the Argentine side known as the General Manuel Belgrano Railway.[7]
2. ↑ Different topographic maps report different heights;[18] in 1902 it was considered to be 5,980 metres (19,620 ft) high.[19] Other data from digital elevation models: SRTM yields 6,017 metres (19,741 ft),[20] ASTER 5,998 metres (19,678 ft),[21] SRTM filled with ASTER6,018 metres (19,744 ft),[21] ALOS 5,998 metres (19,678 ft)[22] and TanDEM-X 6,066 metres (19,902 ft).[23]
3. ↑ The height of the nearest key col is 5,320 metres (17,450 ft),[24] leading to a topographic prominence of 731 metres (2,398 ft) with a topographical dominance of 12.08%. Its parent peak is Ojos del Salado and the Topographic isolation is 302.2 kilometres (187.8 mi).[25]
4. ↑ Also spelled Socompa Caipe[82] or Caipis. Caipi in Quechua means "here".[16]
5. ↑ The moss Globulinella halloyi was discovered on Socompa.[98]
6. ↑ However, the source refers to the Global Volcanism Program entry which mentions 5250 BCE rather than 5250 BP[110]

## References

1. ↑ 1.0 1.1 1.2 "Argentina and Chile North Ultra-Prominences" Peaklist.org. Retrieved 25 February 2013.
2. ↑ "Socompa" (in en). http://www.andes-specialists.com/socompa-6051.
3. ↑ Jorge González (2011). Historia del Montañismo Argentino.
4. ↑ Federico Reichert (1967). En la cima de las montañas y de la vida.
5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Wadge, Francis & Ramirez 1995, p. 309.
6. ↑ 6.0 6.1 6.2 6.3 van Wyk de Vries et al. 2001, p. 227.
7. ↑ Zappettini et al. 2001, p. 1.
8. ↑ Quiroz, Gabriel (13 November 2014). "El Ferrocarril Trasandino de Antofagasta a Salta." (in es). Anales del Instituto de Ingenieros de Chile (6): ág. 245–Maps. ISSN 0716-324X. http://www.revistas.uchile.cl/index.php/AICH/article/view/34384.
9. ↑ 9.0 9.1 9.2 9.3 9.4 "Socompa". http://volcano.oregonstate.edu/oldroot/CVZ/socompa/.
10. ↑ Molina Otárola, Raúl (December 2011). "Los Otros Arrieros de los Valles, la Puna y el Desierto de Atacama" (in es). Chungará (Arica) 43 (2): 177–187. doi:10.4067/S0717-73562011000200002. ISSN 0717-7356.
11. ↑ Fundación Miguel Lillo 2018, p. 436.
12. ↑ 12.0 12.1 Halloy 1991, p. 249.
13. ↑ Leibowicz, Iván; Moyano, Ricardo; Ferrari, Alejandro; Acuto, Félix; Jacob, Cristian (3 July 2018). "Culto y Peregrinaje Inka en el Nevado de Cachi, Salta, Argentina. Nuevos datos en Arqueología de Alta Montaña". Ñawpa Pacha 38 (2): 194. doi:10.1080/00776297.2018.1513659. ISSN 0077-6297.
14. ↑ 14.0 14.1 Vitry, Christian (September 2020). "Los Caminos Ceremoniales en los Apus del Tawantinsuyu". Chungará (Arica) 52 (3): 512, 519. doi:10.4067/S0717-73562020005001802. ISSN 0717-7356. https://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-73562020000300509&lng=en&nrm=iso&tlng=en.
15. ↑ Paige, Gustavo Le (1975). "¿Se puede hablar de transhumancia en la zona atacameña?" (in es). Estudios Atacameños. Arqueología y Antropología Surandinas (3): 16. doi:10.22199/S07181043.1975.0003.00004. ISSN 0718-1043. http://revistas.ucn.cl/index.php/estudios-atacamenos/article/view/95.
16. ↑ 16.0 16.1 Ceruti, María Constanza (2012). "A la Sombra del Socompa: Ascensos a las Cimas de los volcanes Rosado, Mellado y Socompa Caipis" (in es). Cuadernos Universitarios (V): 264. ISSN 2250-7132. http://revistas.ucasal.edu.ar/index.php/CU/article/view/113/89.
17. ↑ 17.0 17.1 17.2 Stern, Charles R. (December 2004). "Active Andean volcanism: its geologic and tectonic setting". Revista Geológica de Chile 31 (2): 161–206. doi:10.4067/S0716-02082004000200001. ISSN 0716-0208.
18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 Halloy 1991, p. 248.
19. ↑ Latzina, Francisco (1902) (in es). La Argentina: considerada en sus aspectos físico, social y económico. Compañía Sud-Americana de Billetes de Banco. pp. 459. OCLC 4875122. https://books.google.com/books?id=nbMsAAAAYAAJ.
20. ↑ USGS, EROS Archive. "USGS EROS Archive - Digital Elevation - SRTM Coverage Maps". https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-srtm-coverage-maps?qt-science_center_objects=4#qt-science_center_objects.
21. ↑ 21.0 21.1 "ASTER GDEM Project". https://ssl.jspacesystems.or.jp/ersdac/GDEM/E/.
22. ↑ "ALOS GDEM Project". https://www.eorc.jaxa.jp/ALOS/en/aw3d30/index.htm.
23. ↑ TanDEM-X, TerraSAR-X. "Copernicus Space Component Data Access". https://spacedata.copernicus.eu/web/cscda/missions/tandem-x.
24. ↑ "Andean Mountains - All above 5000m" (in en). http://www.andes-specialists.com/andean-mountains-5000/.
25. ↑ "Socompa" (in en). http://www.andes-specialists.com/socompa-6051.
26. ↑ 26.0 26.1 26.2 26.3 26.4 26.5 Wadge, Francis & Ramirez 1995, p. 313.
27. ↑ 27.00 27.01 27.02 27.03 27.04 27.05 27.06 27.07 27.08 27.09 27.10 Wadge, Francis & Ramirez 1995, p. 310.
28. ↑ Favetto et al. 2018, p. 2.
29. ↑ 29.0 29.1 29.2 Grosse et al. 2022, p. 2.
30. ↑ 30.0 30.1 30.2 Wadge, Francis & Ramirez 1995, p. 314.
31. ↑ Wadge, Francis & Ramirez 1995, pp. 314,315.
32. ↑ van Wyk de Vries et al. 2001, p. 229.
33. ↑ 33.0 33.1 van Wyk de Vries et al. 2001, p. 230.
34. ↑ Grosse et al. 2022, p. 7.
35. ↑ 35.0 35.1 Guevara, Apaza & Favetto 2023, p. 1.
36. ↑ 36.0 36.1 36.2 36.3 van Wyk de Vries et al. 2001, p. 228.
37. ↑ Guevara, Apaza & Favetto 2023, p. 5.
38. ↑ Guevara, Apaza & Favetto 2023, p. 6.
39. ↑ van Wyk de Vries et al. 2001, p. 225.
40. ↑ Francis, P. W.; Wells, G. L. (1 July 1988). "Landsat Thematic Mapper observations of debris avalanche deposits in the Central Andes". Bulletin of Volcanology 50 (4): 270. doi:10.1007/BF01047488. ISSN 0258-8900. Bibcode: 1988BVol...50..258F.
41. ↑ 41.0 41.1 41.2 41.3 Doucelance et al. 2014, p. 2284.
42. ↑ Deruelle 1978, p. 176.
43. ↑ 43.0 43.1 43.2 43.3 43.4 Francis et al. 1985, p. 601.
44. ↑ Kelfoun & Druitt 2005, p. 12.
45. ↑ Davies, McSaveney & Kelfoun 2010, p. 941.
46. ↑ Wadge, Francis & Ramirez 1995, p. 334.
47. ↑ Wadge, Francis & Ramirez 1995, p. 335.
48. ↑ 48.0 48.1 Wadge, Francis & Ramirez 1995, p. 329.
49. ↑ Doucelance et al. 2014, p. 2293.
50. ↑ Wadge, Francis & Ramirez 1995, p. 326.
51. ↑ Wadge, Francis & Ramirez 1995, p. 315.
52. ↑ 52.0 52.1 van Wyk de Vries et al. 2001, p. 226.
53. ↑ 53.0 53.1 53.2 Francis et al. 1985, p. 600.
54. ↑ 54.0 54.1 Doucelance et al. 2014, p. 2283.
55. ↑ Wooller, Luke; Vries, Benjamin van Wyk de; Murray, John B.; Rymer, Hazel; Meyer, Stephanie (1 July 2004). "Volcano spreading controlled by dipping substrata". Geology 32 (7): 575. doi:10.1130/G20472.1. ISSN 0091-7613. Bibcode: 2004Geo....32..573W.
56. ↑ Grosse et al. 2022, p. 11.
57. ↑ Grosse et al. 2022, p. 14.
58. ↑ 58.0 58.1 58.2 Wadge, Francis & Ramirez 1995, p. 319.
59. ↑ Grosse et al. 2022, p. 13.
60. ↑ 60.0 60.1 Wadge, Francis & Ramirez 1995, p. 331.
61. ↑ 61.0 61.1 van Wyk de Vries et al. 2001, p. 239.
62. ↑ van Wyk de Vries et al. 2001, p. 242.
63. ↑ Francis et al. 1985, p. 603.
64. ↑ Doucelance et al. 2014, p. 2282.
65. ↑ Davies, McSaveney & Kelfoun 2010, p. 933.
66. ↑ 66.0 66.1 Wadge, Francis & Ramirez 1995, p. 312.
67. ↑ 67.0 67.1 Wadge, Francis & Ramirez 1995, p. 318.
68. ↑ 68.0 68.1 Wadge, Francis & Ramirez 1995, p. 327.
69. ↑ Wadge, Francis & Ramirez 1995, pp. 318,319.
70. ↑ Wadge, Francis & Ramirez 1995, p. 320.
71. ↑ 71.0 71.1 Wadge, Francis & Ramirez 1995, p. 332.
72. ↑ 72.0 72.1 72.2 Kelfoun & Druitt 2005, p. 2.
73. ↑ Francis et al. 1985, p. 602.
74. ↑ Wadge, Francis & Ramirez 1995, p. 316.
75. ↑ van Wyk de Vries et al. 2001, p. 234.
76. ↑ 76.0 76.1 Amigo, Álvaro R.; Bertin, Daniel U.; Orozco, Gabriel L. (2012) (in es). ﻿Peligros volcánicos de la Zona Norte de Chile﻿ (Report). Carta geológica de Chile: Serie Geología Ambiental. 17. SERVICIO NACIONAL DE GEOLOGÍA Y MINERÍA. pp. 20–21. ISSN 0717-7305. https://biblioteca.sernageomin.cl/opac/datafiles/CGCH_GAMB_17_TextoyMapa.pdf. Retrieved 20 August 2021.
77. ↑ 77.0 77.1 Conde Serra et al. 2020, p. 10.
78. ↑ 78.0 78.1 Wadge, Francis & Ramirez 1995, p. 311.
79. ↑ 79.0 79.1 Wadge, Francis & Ramirez 1995, pp. 310–312.
80. ↑ 80.0 80.1 80.2 Rissmann et al. 2015, p. 166.
81. ↑ Gardeweg, Moyra; Ramírez, Carlos F. (1 June 1987). "La Pacana caldera and the Atana Ignimbrite — a major ash-flow and resurgent caldera complex in the Andes of northern Chile". Bulletin of Volcanology 49 (3): 550. doi:10.1007/BF01080449. ISSN 0258-8900. Bibcode: 1987BVol...49..547G.
82. ↑ Zappettini et al. 2001, p. 21.
83. ↑ van Wyk de Vries et al. 2001, pp. 227,228.
84. ↑ Deruelle 1978, p. 178.
85. ↑ Conde Serra et al. 2020, p. 14.
86. ↑ Vimercati, Lara; Solon, Adam J.; Krinsky, Alexandra; Arán, Pablo; Porazinska, Dorota L.; Darcy, John L.; Dorador, Cristina; Schmidt, Steven K. (1 January 2019). "Nieves penitentes are a new habitat for snow algae in one of the most extreme high-elevation environments on Earth". Arctic, Antarctic, and Alpine Research 51 (1): 191. doi:10.1080/15230430.2019.1618115. ISSN 1523-0430.
87. ↑ Schmidt, Naff & Lynch 2012, p. 444.
88. ↑ Halloy 1991, p. 251.
89. ↑ Halloy 1991, p. 252.
90. ↑ 90.0 90.1 90.2 Costello et al. 2009, p. 735.
91. ↑ Hastenrath, Stefan L. (January 1971). "On the Pleistocene Snow-Line Depression in the Arid Regions of the South American Andes". Journal of Glaciology 10 (59): 262. doi:10.1017/S0022143000013228. ISSN 0022-1430. Bibcode: 1971JGlac..10..255H.
92. ↑ Halloy 1991, p. 247.
93. ↑ 93.0 93.1 Costello et al. 2009, p. 736.
94. ↑ Costello et al. 2009, p. 741.
95. ↑ Costello et al. 2009, p. 744.
96. ↑ Costello et al. 2009, p. 745.
97. ↑ Schmidt, Naff & Lynch 2012, p. 447.
98. ↑ Schiavone, MarÍa M.; Suárez, Guillermo M. (2009). "Globulinella halloyi (Pottiaceae), a new species from Argentina". The Bryologist 112 (3): 584. doi:10.1639/0007-2745-112.3.584. ISSN 0007-2745.
99. ↑ Fundación Miguel Lillo 2018, p. 160.
100. ↑ Halloy 1991, p. 255.
101. ↑ Halloy 1991, p. 260.
102. ↑ Schmidt, Naff & Lynch 2012, p. 445.
103. ↑ Fundación Miguel Lillo 2018, p. 220.
104. ↑ Steppan, Scott J; Bowen, Thomas; Bangs, Max R; Farson, Matthew; Storz, Jay F; Quiroga-Carmona, Marcial; D’Elía, Guillermo; Vimercati, Lara et al. (13 September 2022). "Evidence of a population of leaf-eared mice Phyllotis vaccarum above 6,000 m in the Andes and a survey of high-elevation mammals". Journal of Mammalogy 103 (4): 776–785. doi:10.1093/jmammal/gyac028. PMID 36118797. PMC 9469927. https://academic.oup.com/jmammal/article-abstract/103/4/776/6563873?redirectedFrom=fulltext&login=false.
105. ↑ Deruelle 1978, p. 182.
106. ↑ GROSSE, Pablo; GUZMÁN, Silvina; PETRINOVIC, Ivan (2017). "VOLCANES COMPUESTOS CENOZOICOS DEL NOROESTE ARGENTINO" (in es) (PDF). Tucuman: 20th Chilean Geological Congress. p. 503. https://www.researchgate.net/publication/322101316.
107. ↑ Grosse et al. 2022, p. 10.
108. ↑ 108.0 108.1 Grosse et al. 2022, p. 4.
109. ↑ Grosse et al. 2022, p. 3.
110. ↑ "Socompa". Smithsonian Institution. https://volcano.si.edu/volcano.cfm?vn=355109.
111. ↑ Halloy 1991, p. 254.
112. ↑ Schmidt, S. K.; Gendron, E. M. S.; Vincent, K.; Solon, A. J.; Sommers, P.; Schubert, Z. R.; Vimercati, L.; Porazinska, D. L. et al. (20 March 2018). "Life at extreme elevations on Atacama volcanoes: the closest thing to Mars on Earth?". Antonie van Leeuwenhoek 111 (8): 1390. doi:10.1007/s10482-018-1066-0. PMID 29557533.
113. ↑ 113.0 113.1 Liu et al. 2023, p. 2.
114. ↑ Liu et al. 2023, p. 8.
115. ↑ Garcia, Sebastian; Badi, Gabriela (1 November 2021). "Towards the development of the first permanent volcano observatory in Argentina" (in en). Volcanica 4 (S1): 26. doi:10.30909/vol.04.S1.2148. ISSN 2610-3540. http://www.jvolcanica.org/ojs/index.php/volcanica/article/view/74.
116. ↑ Rissmann et al. 2015, p. 172.
117. ↑ Godfrey, L. V.; Herrera, C.; Gamboa, C.; Mathur, R. (20 July 2019). "Chemical and isotopic evolution of groundwater through the active Andean arc of Northern Chile". Chemical Geology 518: 42. doi:10.1016/j.chemgeo.2019.04.011. ISSN 0009-2541. Bibcode: 2019ChGeo.518...32G.
118. ↑ Favetto et al. 2018, p. 3.
119. ↑ Fuentes, Francisca Noemi Valenzuela (15 February 2012). "Energía geotérmica y su implementación en Chile" (in es). Revista Interamericana de Ambiente y Turismo – RIAT 7 (1): 7–8. ISSN 0718-235X. http://riat.utalca.cl/index.php/test/article/view/115.
120. ↑ Townley, Richard (9 January 2018). "Geothermal volcano exploration moves ahead in Argentina – BNamericas" (in en). BNamericas. http://www.bnamericas.com/news/electricpower/geothermal-volcano-exploration-moves-ahead-in-argentina.

## References

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* Costello, Elizabeth K.; Halloy, Stephan R. P.; Reed, Sasha C.; Sowell, Preston; Schmidt, Steven K. (1 February 2009). "Fumarole-Supported Islands of Biodiversity within a Hyperarid, High-Elevation Landscape on Socompa Volcano, Puna de Atacama, Andes". Applied and Environmental Microbiology 75 (3): 735–747. doi:10.1128/AEM.01469-08. ISSN 0099-2240. PMID 19074608. Bibcode: 2009ApEnM..75..735C.
* Davies, Tim; McSaveney, Mauri; Kelfoun, Karim (1 October 2010). "Runout of the Socompa volcanic debris avalanche, Chile: a mechanical explanation for low basal shear resistance". Bulletin of Volcanology 72 (8): 933–944. doi:10.1007/s00445-010-0372-9. ISSN 0258-8900. Bibcode: 2010BVol...72..933D.
* Deruelle, B. (1 September 1978). "The Negros de Aras Nuée Ardente deposits: a cataclysmic eruption of Socompa volcano (Andes of Atacama, Chile)". Bulletin Volcanologique 41 (3): 175–186. doi:10.1007/BF02597221. ISSN 0366-483X. Bibcode: 1978BVol...41..175D.
* Doucelance, Régis; Kelfoun, Karim; Labazuy, Philippe; Bosq, Chantal (1 June 2014). "Geochemical insights into the internal dynamics of debris avalanches. A case study: The Socompa avalanche, Chile". Geochemistry, Geophysics, Geosystems 15 (6): 2282–2300. doi:10.1002/2014gc005235. ISSN 1525-2027. Bibcode: 2014GGG....15.2282D. https://hal.archives-ouvertes.fr/hal-01133672/file/Doucelance&al;_Gcubed15_2014.pdf.
* Favetto, Alicia; Pomposiello, Cristina; Guevara, Liliana; Giordanengo, Gabriel (2018) (in es). Relevamiento Magnetotellurico Geofísico del Sector Comprendido entre la Quebrada del Agua y la Laguna Socompá, Puna Argentina. Instituto de Geocronología y Geología Isotópica. http://repositorio.segemar.gov.ar/handle/308849217/2138. Retrieved 2018-11-13.
* Francis, P. W.; Gardeweg, M.; Ramirez, C. F.; Rothery, D. A. (1 September 1985). "Catastrophic debris avalanche deposit of Socompa volcano, northern Chile". Geology 13 (9): 600–603. doi:10.1130/0091-7613(1985)13<600:CDADOS>2.0.CO;2. ISSN 0091-7613. Bibcode: 1985Geo....13..600F.
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* Grosse, Pablo; Danišík, Martin; Apaza, Facundo D.; Guzmán, Silvina R.; Lahitte, Pierre; Quidelleur, Xavier; Self, Stephen; Siebe, Claus et al. (17 August 2022). "Holocene collapse of Socompa volcano and pre- and post-collapse growth rates constrained by multi-system geochronology" (in en). Bulletin of Volcanology 84 (9): 85. doi:10.1007/s00445-022-01594-0. ISSN 1432-0819. Bibcode: 2022BVol...84...85G. https://link.springer.com/article/10.1007/s00445-022-01594-0.
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* Rissmann, Clinton; Leybourne, Matthew; Benn, Chris; Christenson, Bruce (9 March 2015). "The origin of solutes within the groundwaters of a high Andean aquifer". Chemical Geology 396: 164–181. doi:10.1016/j.chemgeo.2014.11.029. Bibcode: 2015ChGeo.396..164R.
* Schmidt, S. K.; Naff, C. S.; Lynch, R. C. (1 August 2012). "Fungal communities at the edge: Ecological lessons from high alpine fungi". Fungal Ecology. Fungi in Extreme Environments 5 (4): 443–452. doi:10.1016/j.funeco.2011.10.005.
* Wadge, G.; Francis, P. W.; Ramirez, C. F. (1 July 1995). "The Socompa collapse and avalanche event". Journal of Volcanology and Geothermal Research. Models of Magnetic Processes and Volcanic Eruptions 66 (1): 309–336. doi:10.1016/0377-0273(94)00083-S. Bibcode: 1995JVGR...66..309W.
* van Wyk de Vries, B; Self, S; Francis, P. W; Keszthelyi, L (1 February 2001). "A gravitational spreading origin for the Socompa debris avalanche". Journal of Volcanology and Geothermal Research 105 (3): 225–247. doi:10.1016/S0377-0273(00)00252-3. Bibcode: 2001JVGR..105..225V.
* Zappettini, Eduardo O.; Blasco, Graciela; Ramallo, Eulogio Ernesto; González, Osvaldo Edgar (2001) (in es) (PDF). ﻿Hoja Geológica 2569-II Socompa﻿ (Report). Boletín 260. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales. ISSN 0328-2333. http://repositorio.segemar.gob.ar/handle/308849217/184.

## External links

* Conde Sierra, Alejandro (2017). "Volcán Socompa" (in es). http://repositorio.segemar.gov.ar/handle/308849217/966.
* "Volcán Socompa, Argentina/Chile" on Peakbagger

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Andean volcanoes

Northern Volcanic Zone
(6° N – 3° S)|

* Paipa-Iza
* Romeral
* Cerro Bravo
* Nevado del Ruiz
* Nevado del Tolima
* Nevado del Huila
* Puracé
* Doña Juana
* Galeras
* Azufral
* Chiles
* Cayambe
* Reventador
* Pichincha
* Antisana
* Aliso
* Soche
* Illiniza
* Cotopaxi
* Quilotoa
* Chimborazo
* Tungurahua
* Licto volcanic field
* Sangay

Central Volcanic Zone
(14°–27° S)|

* Quimsachata
* Auquihuato
* Firura
* Sara Sara
* Solimana
* Coropuna
* Hualca Hualca
* Sabancaya
* Huambo volcanic field
* Ampato
* Andagua volcanic field
* Chachani
* Misti
* Ubinas
* Pichu Pichu
* Huaynaputina
* Ticsani
* Tutupaca
* Yucamane
* Purupuruni
* Casiri
* Tacora
* Taapaca
* Parinacota
* Lauca
* Tata Sabaya
* Isluga
* Irruputuncu
* Olca-Paruma
* Aucanquilcha‎
* Azufre
* Sairecabur
* Licancabur
* Pacana
* Lascar
* Chiliques
* Aracar
* Socompa
* Llullaillaco
* Lastarria
* Galán
* San Francisco
* Cueros de Purulla
* Incahuasi
* Ojos del Salado

Southern Volcanic Zone
(33°–46° S)|

* Tupungato
* Tupungatito
* Maipo
* Calabozos
* Descabezado Grande
* Cerro Azul
* Nevado de Longaví
* Nevados de Chillán
* Antuco
* Copahue
* Callaqui
* Lonquimay
* Llaima
* Sollipulli
* Villarrica
* Quetrupillán
* Lanín
* Mocho-Choshuenco
* Carrán-Los Venados
* Puyehue-Cordón Caulle
* Casablanca
* Osorno
* Calbuco
* Hornopirén
* Huequi
* Michinmahuida
* Chaitén
* Corcovado
* Mentolat
* Cay
* Macá
* Hudson

Austral Volcanic Zone
(49°–55° S)|

* Lautaro
* Viedma
* Aguilera
* Reclus
* Burney
* Fueguino

Note: volcanoes are ordered by latitude from north to south

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