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Llullaillaco

Summary

Llullaillaco (Spanish pronunciation: [ʎuʎajˈʎako]) is a dormant stratovolcano on the border between Argentina (Salta Province) and Chile (Antofagasta Region). It lies in the Puna de Atacama, a region of tall volcanic peaks on a high plateau close to the Atacama Desert, one of the driest places in the world. Its maximum elevation is most commonly given as 6723 m, making it the second- or third-highest volcano in the world. Despite its height, it is not clear whether the volcano has any glaciers or merely patches of perennial snow and ice. Between 3700 m and 5000 m elevation there is a sparse plant cover, while at lower altitudes the climate is too dry for plants to grow. A species of mouse on Llullaillaco is the highest-living known vertebrate species.

Llullaillaco
Llullaillaco from the east
Highest point
Elevation6,739 m (22,110 ft) Edit this on Wikidata
Prominence2,344 m (7,690 ft) Edit this on Wikidata
Isolation264.53 km (164.37 mi) Edit this on Wikidata
ListingUltra
Coordinates24°43′00″S 68°32′00″W / 24.71667°S 68.53333°W / -24.71667; -68.53333[1]
Geography
Llullaillaco is located in Chile
Llullaillaco
Llullaillaco
Location in Chile (on border with Argentina)
LocationChile and Argentina
Parent rangeAndes, Puna de Atacama
Geology
Age of rockPleistocene
Mountain typeStratovolcano
Last eruptionMay 1877[2]
Climbing
First ascent1950, but previous climbs by Inca

The volcano formed during the Pleistocene in two stages, named Llullaillaco I and Llullaillaco II. The oldest rocks are about 1.5 million years old. About 150,000 years ago, the volcano's southeastern flank collapsed, generating a debris avalanche that reached as far as 25 km from the summit. During the last stage, three conspicuous lava flows were emplaced on the summit. The youngest dated rocks are 930 ± 140 years old, but there are reports of activity from the 19th century.

The mountain's first recorded climb was in 1950, but traces of earlier climbs and a number of archaeological sites were found on the mountain and at its feet; Llullaillaco marks the highest archaeological site in the world. In 1999, the mummified remains of three children, known as the Children of Llullaillaco, were found at its summit. They are presumed to have been human sacrifices.

Name edit

The name Llullaillaco is derived from the Quechua word llulla meaning "false", "lie" or "deceitful" and yaku or llaco meaning "water".[3] This name probably refers to meltwater from snow, which flows down the slopes but then is absorbed into the soil;[4][5] normally mountains are sources for water.[6][3] Another possibility is that it refers to the danger from floods in the local valleys.[7] Other translations are (Aymara) "hot water"[8] after lloclla "warm" and yacu "water",[9] and (Quechua) "thinking", "memory"+"water"[10] or "thing that hardens after forming tender" llullu, which may refer to volcanic activity.[6]

Geography and geomorphology edit

Llullaillaco is located in the northwestern Argentine Andes,[11] towards the southern end of the Puna.[12] The frontier between Argentina and Chile passes over the mountain.[13] The Argentine portion is in the Los Andes Department of Salta Province[14] and the Chilean in Chile's Antofagasta Region.[15][16] About 30 km northeast of Llullaillaco, a railway crosses the Andes at Socompa.[17] Humans first moved into the area about 8,000 BCE.[6] The region was inhabited by hunters and shepherds in pre-Hispanic times.[9] At some point between 1470 and 1532 CE, the Inca empire occupied the region.[6]

There are numerous abandoned mines in the region,[18] and the active lithium production plant "Proyecto Mariana" at Salar de Llullaillaco.[19][20] Azufrera Esperanto is an abandoned sulfur mine north of Llullaillaco and is associated with an area of hydrothermal alteration. The mine can be reached through a road or path from the northwest.[21][22] Another abandoned mine lies south of the volcano.[22] Mina Amalia is an abandoned borate mine and Mina Luisa and Mina Maria abandoned salt mines at Salar de Llullaillaco.[22] A weather station installed on Llullaillaco in 2004 was for some time the highest in the world.[23] The region is dry and located at high altitudes, making work in the area difficult.[24] The extreme environmental conditions have been compared to conditions on Mars.[25]

Geomorphology edit

 
Llullaillaco seen from Cerro Paranal, 189 km away.

The volcano is an imposing mountain, rising by 3800 m and 3750 m above the Salar de Punta Negra 36 km and Sala de Llullaillaco 20 km away, respectively.[26][24] With a summit height of 6723 m,[27][1][28] (or 6739 m[2]) it is one of the highest mountains in the Andes[14] (third highest in Chile[7] and seventh-highest in the Andes, according to John Biggar[29]) and the second-[1] or third-highest volcano in the world[13] (Ojos del Salado is the highest[27]). In the early 20th century, Llullaillaco was thought to be the highest volcano in the world.[30] The elevation is to a large degree consequence of the underlying terrain, which rises about 4 km above sea level.[31] The height of the mountain and the clear air in the region make Llullaillaco visible from Cerro Paranal, 190 km away as measured through Google Maps.[32] The view from the mountain extends from Licancabur north over the Nevados de Cachi mountains east to[6] Ojos del Salado 250 km south;[33] mountains in between are visible as well.[6]

Llullaillaco is a composite volcano formed mostly by lava flows. It rises about 2.2 km[27]-2.5 km above the surrounding terrain[13] and hundreds of metres above surrounding mountains.[14] The summit of Llullaillaco is formed by a small cone with about four associated lava domes,[34] which reach lengths of 1–3 km and have abrupt walls.[35] Three hollows, probably volcanic craters, lie east of a 200 m long crest at the summit.[36] The slopes of the volcano are fairly steep, with an altitude drop of 1800 m over only 3 km horizontal distance.[24][26] The slopes high up are steeper than those at lower altitudes.[37] A plateau at 5600–6100 m elevation is the remnant of an eroded crater[38] from an early stage in Llullaillaco's development.[39]

 
Llullaillaco seen from space, with lava flows clearly visible.

Three young-looking, 4.5–8 km long lava flows emanate from the summit cone[34] to the north and south.[18] Morphologically, these flows are reddish-black aa lava flows and feature black and reddish glassy blocks with sizes of 5 m.[34][40][34] The fronts of the stubby, lobe-shaped flows[40] are up to 15 m thick. Morphologically, these flows are reddish-black aa lava flows and feature blocks with sizes of 5 m.[34] The northern flow has prominent levee-like structures[41] and splits into a northwestern and northeastern branch[18] upon reaching an obstacle.[42] The southwestern[18] lava flow is 6 km long and was fairly viscous when it was erupted.[40] It almost reaches a road southwest of the volcano.[43] The third flow is just east from the southwestern[18] and descends an altitude of 2 km.[40] The flows have levee-like structures and ridges.[2] On the northern flank is Azufrera Esperanto, an 5561 m high eroded volcano with sulfur deposits and traces of hydrothermal alteration.[34] The existence of a cave on Llullaillaco is doubtful.[44] The edifice covers an elliptical area of 23 km × 17 km[27] with about 37 cubic kilometres (8.9 cu mi)[45][46]-50 cubic kilometres (12 cu mi) of volcanic rock.[27][47] The ground at Llullaillaco is formed mostly by lavic rocks and block debris, which are frequently buried by tephra.[48] The rocks are grey, except where weathering has coloured them black, brown, red or yellow,[35] and their appearance is vitrophyric or porphyritic.[40]

Several dry valleys originate on Llullaillaco, including Quebrada de las Zorritas on the north-northeastern slope, Quebrada El Salado and Quebrada Llullaillaco on the northwestern slope, and Quebrada La Barda on the southwestern slope.[49] Most of the dry valleys drain into Salar de Punta Negra.[50] There is little erosion by water,[37] and the valley network is poorly developed.[37] There is water only episodically,[51] during snowmelt.[52] Only Quebrada de las Zorritas carries permanent water.[53] There is a permanent spring there,[54] possibly in Quebrada de Llullaillaco and Quebrada de Tocomar as well,[55] while there are no known springs on the Argentine side of Llullaillaco.[5] Darapsky in 1900 reported the existence of warm springs at Ojo del Llullaillaco and Ojo de Zorritas[56]

Several small lakes are found at 5850 m elevation.[57] At 6170 m elevation on the northwestern flank is Lago Llullaillaco lake,[58] a 1.2–1.4 hectares (3.0–3.5 acres) frozen waterbody.[58] It is one of the highest lakes in the world.[59]

  •  
    Llullaillaco during sunset
  •  
    Llullailaco with a road leading to the mountain.
  •  
    Llullaillaco from the base camp.
  •  
    Lava flow from Llullaillaco
  •  
    Llullaillaco in Salta

Debris avalanche edit

A major landslide occurred in the volcano's history during the late Pleistocene, probably triggered by volcanic activity.[60] This landslide descended the eastern-southeastern flanks of the volcano into Argentina,[40][2] first over a steep slope of 20° on the volcano,[61] split around Cerro Rosado and entered the Salina de Llullaillaco 25 km east of the summit,[40] extending up to 5 km into the salar.[62] The toe of the avalanche reaches a thickness of 10 m above the salar in the avalanche's southern lobe. Part of the avalanche was channelled in a valley between Cerro Rosado and an unnamed volcano farther south.[63] When it reached Cerro Rosado, the avalanche climbed about 400 m and mostly continued to flow southeast into the main avalanche path, with only a small flow continuing northeastwards. Part of the run-up avalanche later collapsed backwards over the main avalanche deposit.[64] Unlike Socompa farther north, a landslide scar is only poorly developed at Llullaillaco despite the large size of the collapse;[65] it was largely filled in later by lava flows and volcaniclastic debris.[66]

This landslide has been subdivided into four facies and features landforms like levees up to 50 m high,[67] longitudinal ridges and a run-up mark on Cerro Rosado.[62] Such ridges may be associated with uneven underlying terrain.[68] The surface of the slide is covered by lava bombs less than 1 m long, blocks exceeding 2 m width, cobbles, and gravel-like rocks.[69] The largest blocks with sizes of up to 20 m are found close to the collapse scarp.[64] Overall, the margins of the landslide are very crisp and the surface covered by hummocks.[70]

The landslide deposit covers a surface of about 165 square kilometres (64 sq mi).[40] Its volume has been estimated at 1–2 km3 and the speed at 45–90 metres per second (150–300 ft/s). This speed range is comparable to that of the Colima, Lastarria, and Mount St. Helens debris avalanches.[71] The landslide occurred no later than 156,000 – 148,000 ± 5,000 years ago,[40] it might coincide with the 48,000 year old lava flow.[61] Another possibility is that the collapse took place in multiple failures.[72] Some volcanic rocks were still hot at the time of the collapse, indicating that volcanic activity occurred immediately before the collapse.[65] A smaller undated avalanche occurred on the northeastern flank.[40]

Such landslides are common at volcanoes, where they are favoured by the steep edifices that form from lava flows being stacked on top of each other. It is not usually known what triggers the collapse, although eruption-associated earthquakes are suspected to play a role. Other volcanoes in the region with sector collapses are: Lastarria, Ollague, San Pedro, Socompa, and Tata Sabaya.[73] The Mellado and Cerro Rosado volcanoes close to Llullaillaco also display evidence of sector collapses.[66]

Geology edit

Regional setting edit

Volcanism in the Andes is caused by the subduction of the Nazca Plate and the Antarctic Plate beneath the South America Plate. The Nazca Plate subducts at a speed of 7–9 centimetres per year (2.8–3.5 in/year) and the Antarctic Plate at a speed of 2 cm/year. Volcanism is not continuous along the Andes, rather it occurs in four distinct volcanic zones: Northern Volcanic Zone (NVZ), Central Volcanic Zone (CVZ), Southern Volcanic Zone (SVZ) and Austral Volcanic Zone (AVZ). The formation of magma results from the release of water and other volatile material from the subducting plate, which is then injected into the above-lying mantle wedge. The volcanic zones are separated by gaps, where subduction occurs at a flatter angle due to the presence of ridges on the downgoing plate: The Nazca Ridge in the gap between the NVZ and CVZ, the Juan Fernandez Ridge in the one between the CVZ and SVZ, and the gap between the SVZ and AVZ is associated with the Chile Triple Junction.[74][75] Minor ridges are associated with decreased volcanism rather than its cessation; the Taltal Ridge projects under Llullaillaco, an area where magma output was less than to the north and south.[76]

About 178 volcanoes are found in the Andes, 60 of which have been active in historical times. In addition, there are large calderas and monogenetic volcanoes.[74]

Llullaillaco is one[77] of more than 1,000 volcanoes in the CVZ.[75] At least 44 volcanic centres with historical activity and 18 large caldera-forming volcanoes have been identified in the Central Volcanic Zone;[74] the most active is Lascar,[28] and Guallatiri and San Pedro have had historical eruptions as well.[78] Volcanism in the Central Volcanic Zone mostly occurs on the Altiplano and the Cordillera Occidental,[79] where high stratovolcanoes[80] with heights of over 6000 m occur.[79] One of the largest vertical drops on Eart, almost 15 km, exists between the summit of Llullaillaco and the Peru-Chile Trench 300 km farther west.[81] The Wadati-Benioff zone lies at 180 km depth.[82]

Local setting edit

The region is dominated by large volcanic cones (often more than 6000 m high) in the Altiplano and Western Cordillera,[79] and extensive salt flats in low-altitude areas.[83] Southeast of the mountain is Salar de Llullaillaco in Argentina, and Salar de Punta Negra northwest of Llullaillaco in Chile.[17] Neighbouring mountains are 4923 m high Cerro Mitral southwest and 5473 m high Volcan Chuculay north of Llullaillaco.[21] Cerro Rosado is 17 km east of Llullaillaco;[2] iit is a 5383 m high volcano which erupted dacitic lava flows on its northeastern and southern flanks during the Pliocene-Quaternary.[22] Mitral mountain (5015 m) lies southwest of Llullaillaco and is of Miocene age. It features an eroded crater that opens to the northwest.[43][21] Iris mountain (5461 m) north of Llullaillaco is constructed of Pliocene rocks.[43] Other volcanoes in the neighbourhood are Dos Naciones, Cerro Silla, and Cerro 5074.[84] Llullaillaco is associated with a local crustal upwarp.[85] Salar de Llullaillaco is a salt pan[22] 20 km east of the volcano,[24] behind Cerro Rosado. It lies at 3750 m elevation,[86] and features warm springs at its western and southwestern shores.[22] Due east of Salar de Llullaillaco is Salar de Arizaro.[87]

The terrain around Llullaillaco consists of andesite and dacite lavas and pyroclastics of Miocene to Pliocene age.[22] The basement in the 70 km thick crust[82] is formed by Paleozoic sedimentary and volcanic rocks, including marine and volcanic sediments and intrusive rocks.[79] It is mostly buried by Cenozoic volcanic rocks, except in isolated outcrops both west and east of Llullaillaco:[88] The 282 ± 7 million years old Llullaillaco plutonic complex,[89] the Devonian-Carboniferous Zorritas Formation[90] and Oligocene-Miocene layers in the Quebrada de las Zorritas.[91] The rocks of Llullaillaco overlie both this basement and Tertiary ignimbrites.[34] The terrain around the mountain is partially covered by alluvial sediments, debris and pumice.[21]

Volcanism in the Central Andes began during the Jurassic.[92] A pause in volcanism occurred between 38 and 27 million years ago;[75] about 26 million years ago, the Farallon Plate broke up into the Cocos and Nazca Plates,[92] volcanism resumed in the Central Andes[75] and increased subduction of the Nazca Plate during the late Oligocene caused the volcanic arc to broaden to about 250 km. 25 million years ago, the "Quechua event" triggered the uplift of the Puna-Altiplano, a highland covering a surface area of 500000 km2 and reaching an altitude of 3700 m. In the late Miocene-Pliocene a phase of strong ignimbrite volcanism occurred. About 2 million years ago, the "Diaguita deformation" was characterized by a change in the deformation regimen from crustal shortening to strike-slip faulting and of volcanism from voluminous felsic eruptions to isolated stratovolcanoes and back-arc mafic volcanism. A slowdown in the subduction may have caused this change. Nowadays most volcanism occurs at the western edge of the Puna, where volcanoes such as Lascar and Llullaillaco formed.[77][93]

Volcanism in the Central Volcanic Zone may be affected by deep-seated lineaments, such as the Olacapato-El Toro and Archibarca lineaments,[94] which control where volcanoes and geothermal systems form.[95][79] They extend diagonally across the volcanic arc and are accompanied by volcanic manifestations at substantial distances from the arc.[93] The Archibarca lineament runs[96] from the Escondida copper deposit,[97] over Llullaillaco (where it crosses the volcanic arc),[98] Corrida de Cori, Archibarca, Antofalla to the Galán caldera;[99] it influenced the development of Llullaillaco.[77] Other faults are the northeast-southwest trending Guanaqueros[100] and the northwest-southeast trending Imilac-Salina del Fraile; Llullaillaco formed on the trace of the latter fault.[101]

Composition edit

Llullaillaco has produced dacites,[35] which define a potassium- and aluminum-rich[102] calc-alkaline suite. Some rocks display shoshonitic characteristics[103] typical for lavas erupted at large distance from the trenches.[104] Others have medium contents of potassium.[105] Phenocrysts are mostly hornblende or pyroxene with lesser quantities of biotite and quartz; apatite, iron-titanium oxides, opaque minerals, sphene, sulfides and zircon are rare.[40][106] Some phenocrysts show evidence of a complex history.[103] Older rocks contain hematite.[40] Elemental sulfur is found at Llullaillaco,[107] specifically at Azufrera Esperanto;[35] sulfur reserves are estimated to amount to 210,000 tonnes (210,000 long tons; 230,000 short tons).[108]

Trace element data are typical for Central Volcanic Zone rocks.[105] Rocks become more felsic the younger they are:[105] Older rocks contain more quartz and biotite than recent ones,[109] and display higher iron and lower alkali metal contents.[102]

The composition may reflect magma differentiation in a solitary magma chamber, but with occasional replenishment with more primitive/[105] differentiated melts.[105] Processes in the chamber such as magma mixing and plagioclase crystallization[110] yielded melts with homogeneous composition and low volatile concentrations that upon eruption formed viscous lava flows.[103] A lithospheric structure probably directed magma flows over long time periods along the same pathway,[71] and magma interacted with the crust as it ascended.[103] The depth of the magma source probably varied over the history of the volcano.[111] The total magma output at Llullaillaco is about 0.05 cubic kilometres per millennium (0.012 cu mi/ka)[47]-0.02–0.04 km3/ka.[45]

Climate edit

The climate in the region is cold, dry[83] and sunny.[26] Limited climate data are available on Llullaillaco.[112] Temperatures at the summit are about −15 °C (5 °F)[11]-−13 °C (9 °F),[11] with temperature maximums ranging from −8 °C (18 °F) in summer to −13 °C (9 °F) in winter.[113] The temperature of the ground fluctuates strongly between day and night,[114] and can reach 12.5 °C (54.5 °F) in summer.[115] The climate is extremely sunny, perhaps one of the sunniest places on Earth,[53] and UV radiation is intense.[116] The high insolation is due to the lack of cloud cover, the high altitude, and the close coincidence between summer solstice with the day where Earth is closest to the Sun.[117][26]

Mean annual precipitation reaches 20–50 millimetres (0.79–1.97 in)[53] and is episodic to the point that it is difficult to give average values.[118] It is most often associated with either convective activity during summer or cyclones during winter.[119] Snowfall can occur down to altitudes of 4000 m.[120] The Andean Dry Diagonal, where half of the precipitation falls in summer and the other half in winter,[24][121] crosses the Andes at Llullaillaco.[122] It and the Atacama Desert owe its existence to the rainshadow effect of the Andes, air subsidence within South Pacific High, and the cold Humboldt Current off the Pacific coast.[118][123] Owing to the high evaporation rates and low precipitation, the soils at Llullaillaco are among the driest on Earth.[116]

The climate has not always been uniformly dry. Between 14,000 and 9,500 years ago[75] during the late glacial,[124] a wet period gave rise to lakes in the Altiplano[125] (Lake Tauca pluvial).[124] Water discharge from Llullaillaco and neighbouring mountains[126] into Salar de Punta Negra increased,[127] leading to the formation of standing water bodies.[128] As glaciers retreated between 15,000 and 10,000 years ago, lakes shrank.[83] Climate was extremely dry between 9,000 and 4,000 years ago[75] and temperatures warmer than today during the early Holocene (Holocene Climatic Optimum).[129] Deposits in Quebrada de las Zorritas valley indicate that between 2,500 and 1,600 radiocarbon years ago runoff was more intense.[130]

Snow and glaciers edit

 
Snow patches on Llullaillaco

It is not clear whether there are glaciers on Llullaillaco - some sources contend that there are no glaciers on Llullaillaco, which would make it the highest mountain in the world without one,[131] while others state that there are small glaciers above 6000 m altitude,[60] four permanent snowpatches[132] of glaciers on the northeastern and southern flanks,[133] or a single 0.55 km2 (as of 2002) glacier above 6500 m elevation.[134] In 2006 the General Water Directorate of Chile stated that there were seven separate ice bodies on the mountain, all on the northwestern side.[135] An ice slab was reported in 1958 on the western slope[136] between 5600–6500 m elevation,[137] but it is not a glacier.[138][139] The lack of glaciers is a consequence of the dry climate,[140] as the high insolation and dry air cause all snow to evaporate before it can form glaciers.[141]

However, Llullaillaco has permanent[14] snow fields[26] in protected niches,[6] which are not large enough to give rise to glaciers.[142] 1–1.5 m high penitentes occur above 5000 m altitude,[143] especially in more sheltered areas[144] and around the old crater.[145] The snowline lies at 5400–5800 m elevation.[83] Temporary snow cover also occurs.[32] The snowfields on Llullaillaco supply water to the Salar de Punta Negra.[146]

The occurrence of past glaciation at Llullaillaco[147][126] and its neighbours during the Pleistocene is also uncertain.[39] Some traces of past glacier activity are found in the summit area,[39] cirques may have existed on the northwestern slope,[148] where glaciers may have descended to 5100 m elevation,[149] and a moraine girdle may have formed at 4900 m elevation.[150] There is evidence of glacial landforms destroyed by lava[149][48] and volcanic mudflows.[130] It was once believed that Llullaillaco had experienced three large glaciations,[151] but the "moraines" are actually mudflow[149]/volcanic deposits.[152] Even when temperatures decreased during the last glacial maximum, the climate at Llullaillaco may have been too dry to permit glacier development.[153] If any glacier expansion took place, it was during the late glacial when the climate was moister.[124]

Periglacial phenomena are observed on Llullaillaco, commencing at 4300 m altitude and reaching their maximum around 5100–5400 m on the Chilean and 5350–5700 m on the Argentine side. There, solifluction and cryoplanation surfaces are developed,[120] including lobe-shaped ground and block ramparts.[154] These landforms have been mapped on the northwestern side of the volcano.[155] Patterned ground is also common.[156] Permafrost is found at higher altitudes[120] and is connected to the snowfields.[142] Cryoplanation and solifluction landforms are also observed on Iris and Mitral.[91] The landforms probably developed during past periods where the climate was more humid.[120]

Flora and fauna edit

 
Llullaillaco from Salar Rio Grande
 
Llullaillaco from Salar de Aguas Calientes IV

Vegetation is scarce in the arid climate,[60] especially below 3700–3800 m altitude where precipitation is too low to permit vegetation development.[54][157] It takes the form of a steppe, with sparse cushion plants and shrubs.[57] Acantholippia punensis, Atriplex imbricata, and Cristaria andicola are the first plants that grow above this elevation. They are joined at 3900 m altitude by Stipa frigida which can be found up to 4910 m of altitude. The maximum vegetation density is found around 4250 m with 12% of the surface. At this altitude, Adesmia spinosissima, Fabiana bryoides, Mulinum crassifolium, and Parastrephia quadrangularis are found in addition to the previously mentioned plants. Above this altitude, plant cover decreases again, probably due to low temperatures,[54][157] and disappears above 5000 m elevation;[143] most of the volcano lies above this line.[158] Deyeuxia curvula, Distichia muscoides and Oxychloe andina form wetlands (bofedales) in valleys.[159]

The fauna is represented by deer, guanacos, vicuñas[160] and vizcachas.[161] Especially around waterbodies[160] are birds like ducks, flamingos and rheas.[161] Most animals do not reach altitudes above 4600 m.[6] A scorpion species is named after the volcano.[162] There seems to be a population of the mouse Phyllotis xanthopygus on Llullaillaco; it likely is the highest-elevation permanent population of any known vertebrate species.[163]

Lichens grow on rocks.[58] Algae[164] including snow algae[165] and cyanobacteria live on the penitentes,[166] sometimes forming coloured patches,[167] and algae and microbial mats grow in Lago Llullaillaco.[168] A species of bacterium was discovered in the lake.[169] The microorganisms in the lake resemble these of other Central Andean lakes, such as Aguas Calientes and Lake Licancabur, in some ways and differ in others.[170] Species-poor fungal and bacterial communities have been found in the soils (more precisely: tephra[171]) of Llullaillaco,[172] with the fungus Naganishia friedmanii being the most common species.[173] The soils are extremely poor in organic matter[116] and have simple ecological communities.[174] They have to survive environmental conditions[175] among the most extreme on the planet,[176] with aridity, strong UV radiation, daily freeze-thaw cycles and a lack of nutrients.[163] Life may depend on unusual food sources like gaseous carbon monoxide[175] or organic material (e.g remains of plants[163]) transported to the mountain by winds,[177] while photosynthetic organisms are limited to sites with higher water availability.[178]

The area of Llullaillaco is part of the Llullaillaco National Park,[179] a protected area[180] created in 1995[9] and is named after the mountain.[181] Air pollution from the Escondida copper mine may reach Llullaillaco and threaten ecosystems there.[182]

Archaeology edit

In the 1950s a number of archaeological sites were discovered on Llullaillaco.[183] After the initial discovery in 1952, further expeditions by various researchers and organizations took place in 1953, 1954, 1958, 1961, 1974, 1983, 1984, 1985 and 1993.[184] Some sites were looted after their discovery.[185]

 
Archeological site at the top of Llullaillaco

Three Inca roads come to Llullaillaco from Salar de Llullaillaco,[186] Salar de Punta Negra and Socompa,[187] and meet[186] at a tambo (inn) at an altitude of 5200 m[83] on the northeastern flank.[14] The tambo consists of numerous buildings;[83] it was probably a base camp for ascents.[188] On the road from Salar de Llullaillaco[186] is a cemetery, where 16 bodies were found in 1972.[185] The cemetery may host the bodies of people killed in the construction of the Llullaillaco archaeological sites.[189] Half-destroyed walls[185] form a building complex, which was built on terraces[190] and partly buried by loose debris from the mountain above.[191] Two water sites lie between the cemetery and the tambo.[83]

An Inca ceremonial path begins at the tambo and leads up the volcano. It is 1.5–2 m wide (narrower in steeper reaches)[189] and marked by wooden posts[192] and cairns, probably for the case that the path is covered in snow.[83] It continues past two waystations[83] at 5600 m and 6300 m elevation, which consist of small buildings and protecting walls.[188] At 6500 m altitude, the path splits at the so-called "Portezuelo del Inca". One continues to the summit, the other to a plateau at 6715 m elevation.[83] Another set of protecting walls and small buildings form another waystation at 6550 m elevation.[188] Two enclosures and a 11 m × 6 m platform are on the plateau,[83] forming the highest archaeological site on Earth.[193]

The Inca roads connect with the major north–south[194][195] Inca road[196] that runs between San Pedro de Atacama and Copiapo.[195] Infrastructure such as road markers,[197] shelters[198] and tambos are found along the road close to Llullaillaco.[199] The paths on Llullaillaco are not simple footpaths but equipped with retaining walls, delimited edges[200] and above "Portezuelo del Inca" with staircases.[83] They were built by the Inca,[83] their construction methods perhaps reflecting Inca mythology.[201] They were discovered by Mathias Rebitsch in 1958.[202]

Llullaillaco appears to have been the most important Inca sacred mountain in the region[203] and possibly all of the Central Andes,[55] and the complex of archaeological sites is one of the most significant in the Andes.[36] In the case of Llullaillaco, they may have been sites of pilgrimage[190] used by the local Atacama people during Inca rule,[204] no evidence of pre-Inca activity has been found.[205] About forty-five structures have been identified at Llullaillaco, distributed across several sites and with clear architectonic differences, implying not all of them were built by the state.[83] Among the structures are stone circles and roofed buildings.[206] Archeological sites are also found in the valleys that drain Llullaillaco towards the Salar de Punta Negra,[207] including the Quebrada Llullaillaco and the Quebrada de las Zorritas[208] where the Inca paths ascend the mountain.[209] The complex of archaeological sites has become subject of scientific research.[210]

Archaeological sites on mountains are widespread in the Andes, with forty mountains featuring sites in Salta Province alone.[184] Because of the findings, the summit area of the volcano in 2001 was classified as a Lugar Histórico Nacional by the government of Argentina,[211] and in 24 June 2014 the entire Llullaillaco complex was declared a World Heritage Site by UNESCO.[212] A number of myths are associated with Llullaillaco,[30] and the mountain is still important to the inhabitants of Socaire[213] east of the Salar de Atacama,[214] from where it is visible.[215] Some ascents are done for ritual reasons.[216]

Children of Llullaillaco edit

In March 1999, excavations of the platform[188] by a team of archaeologists[217] led by Johan Reinhard,[218] found three mummies of children buried at 1.7 m depth in partially natural, partially excavated pits.[11] They were a 7-year-old boy, a 6-year-old girl and a 15-year-old girl (later research has suggested lower ages for all three[219]),[217] which are known as "El Niño", "La Niña del Rayo" and "La Doncella" respectively.[184] They were found clothed and in a seated position.[220] It is not clear how they were killed; most likely, they were suffocated or buried alive but unconscious,[221] and the boy may have been dead before reaching the summit.[222] The younger children bore traces of cranial deformation.[223] The Llullaillaco bodies are among the best preserved known pre-Columbian mummies[210] owing to the cold, dry and oxygen-poor conditions of the summit[224] which prevent microbial decay of the bodies[225] - except for the youngest mummy, which had been damaged by lightning.[217]

They were ostensibly human sacrifices offered to the gods of the Incan pantheon on mountaintops.[226] Inca human sacrifices were initiated for various reasons, either to mark particular events such as the death of an Inca emperor, to appease nature during natural disasters or to secure resources from the mountain gods. The chosen sacrifices were children, as the gods were thought to prefer pure offerings, preferably children with unblemished bodies and virgin girls. According to historical sources and analyses of the mummies, the children came from families with high social standing and were well nourished. They were brought to mountains thousands of kilometres away and killed at the top.[221][227]

Other archaeological objects found along with the mummies included: Bags made out of leather, headdresses with feathers, pottery (cooking instruments like jars, plates, pots and vases), statues representing both people (male and female) and animals made out of gold, silver or Spondylus (oyster) shells, shoes and textiles,[11][183] wooden and woolen vessels. The vessels and bags contained coca leaves, hairs and human nails.[183] A total of 145 objects were found together with the mummies.[228]

Their discovery drew interest among specialists and the public,[11] and has been cited as a cause for increased tourism to the mountain[229] and increased attention dedicated to native people issues in the region.[230] In 2003 the mummies were at the Catholic University of Salta,[217] before being transferred to the Museum of High Altitude Archaeology of Argentina in 2007,[231] which had been built explicitly to host these mummies.[232] They are kept under special storage conditions to prevent damage.[233] The bodies found at Llullaillaco - both the mummies on the summit and these in the cemetery - have been subject to various scientific analyses.[234] The placement of the mummies in museums led to lengthy disputes with organizations advocating the rights of indigenous people.[235]

Eruption history edit

At least two stages of construction are recognized, Llullaillaco I and Llullaillaco II. The first stage originated from two centres[88] (Llullaillaco and Azufrera Esperanto) developed in a north–south line, producing up to 20 km long lava flows and lava domes in their summit regions. The cones and associated lava flows are heavily eroded by[34] glaciation and hydrothermal alteration[88] and buried by more recent volcanic rocks, but still make up about 70% of the surface of the volcano especially in its western sector. The former crater of Llullaillaco forms a plateau at 5600–6100 m elevation.[34] At the 5561 m high Azufrera Esperanto mountain 5 km north of Llullaillaco little original volcanic substance is preserved and where erosion has exposed deeply altered white rock.[34] Llullaillaco II on the southern and northeastern flank is better preserved; the toes of the lava flows reach thicknesses of 500 m.[40] Its lava flows are less extensive than the ones of Llullaillaco I.[82] Pyroclastic flow deposits with a composition similar to Llullaillaco II are found on the southern slope of the volcano and may have formed before the lava eruptions began.[35]

An older unit is formed by ignimbrites and pyroclastic flows.[82] Older lava flows extend west from the volcano and are partly buried by sediments closer to the edifice.[34] The landslide probably took place during an eruption.[60] An explosive eruption of Llullaillaco II produced a 3 km long deposit of lava blocks and pyroclastic pumice,[236][35] with fallout reaching Cerro Rosado.[42] It is possible that some lava flows interacted with glaciers, causing them to melt.[149]

The oldest dated rocks at Llullaillaco were erupted 1.5 ± 0.4 million years ago, forming a lava flow northwest of Llullaillaco's main edifice.[21] Llullaillaco I is of early Pleistocene age,[88] but the time of the transition between Llullaillaco I and Llullaillaco II is unclear: Either it took place 450,000 years ago,[30] or less than 41,000 ± 1,000 years ago. Ages of 5,600 ± 250 years have been obtained for Llullaillaco II rocks recovered at an altitude of over 6000 m.[149] The young-looking lava flows were at first thought to be of Holocene age, but[2] dating methods yielded ages of less than one million years (potassium-argon dating) for the northern flow, 48,000 ± 12,000 years (argon-argon dating)[40] on the southwestern flow[18] and 930 ± 140 years (surface exposure dating) on an unidentified young flow.[237]

Historical activity and hazards edit

Llullaillaco has been active in historical time, making it the highest historically active volcano on Earth.[2] Three eruptions were recorded during the 19th century,[238] which were however not directly observed:[239]

Activity was probably limited to the emission of steam and ash, given the presence of the archaeological sites.[243] Other reports mention eruptions in 1920, 1931, 1936 and 1960.[236]

According to anecdotes recorded in the 19th century, the mountain occasionally smoked,[244][245] including during the mapping of the Chile-Argentina border on 5 May 1879.[246] Allegedly palaeontologist and zoologist Rodolfo Amando Philippi saw the mountain smoke in 1854,[244] but Philippi's own report makes no mention of smoke.[247]

The volcano is currently considered dormant[27] and there are no known fumaroles,[248] but Lago Llullaillaco[163] and some ice on the volcano bear traces of geothermal heating.[145] There are warm springs around Salar de Llullaillaco.[249] Llullaillaco is classified as Argentina's 16th most dangerous volcano in a list of 38.[250] Future eruptive activity may result in the emission of pyroclastic flows and lava flows[236] and may cause sector collapses, although they would be a small danger to life or property, given that the area is sparsely inhabited and largely devoid of economic activity.[61][251]

Climbing and access edit

The easiest ascent is along the former Inca route on the northeastern flank of the mountain,[252] which can be reached from Chile.[218] Lack of oxygen,[57] blizzards, hypothermia and lightning are common hazards at Llullaillaco.[6] There are reports of landmines in the area,[218] which were removed in 2006 thanks to a multinational effort.[253] A new base camp was inaugurated in 2020.[254]

The volcano can be reached from Argentina via Tolar Grande.[229] Access from Chile is through roads which from Chile Route 5, Socompa Pass, Taltal or Toconao lead to Salar de Punta Negra.[255] From there, a road leads to Llullaillaco. It splits at Aguada de las Zorritas in three: One road ends close to a mountain pass north of Llullaillaco, a second ends at Azufrera Esperanto and the third rounds the volcano from southwest, crossing into Argentina south of Llullaillaco.[21] According to John Biggar, some roads are dead ends. Two ascents with camps lead from Chile and Argentina to the summit.[256]

The first known ascent by Westerners was by the Chileans Bion González and Juan Harsheim in 1952[218] but the indigenous people had ascended it long before. The volcano is the highest mountain with proven prehistoric ascents[257][258] and demonstrates that high altitudes were no obstacle to indigenous people in the Americas,[259] who also built on mountains with primitive technology.[260]

See also edit

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Bibliography edit

  • Darack, Ed (2001). Wild Winds: Adventures in the Highest Andes. Cordee / DPP. ISBN 978-1884980817.
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  • Previgliano, Carlos; Ceruti, Constanza; Reinhard, Johan; Arias, Facundo; Gonzalez, Josefina (2003). "Radiologic Evaluation of the Llullaillaco Mummies". American Journal of Roentgenology. 181 (6): 1473–1479. doi:10.2214/ajr.181.6.1811473. PMID 14627558.
  • Wilson, Andrew; Taylor, Timothy; Ceruti, Constanza; Reinhard, Johan; Chávez, José Antonio; Grimes, Vaughan; Wolfram-Meier-Augenstein; Cartmell, Larry; Stern, Ben; Richards, Michael; Worobey, Michael; Barnes, Ian; Gilbert, Thomas (2007). "Stable isotope and DNA evidence for ritual sequences in Inca child sacrifice". Proceedings of the National Academy of Sciences. 104 (42): 16456–16461. Bibcode:2007PNAS..10416456W. doi:10.1073/pnas.0704276104. PMC 2034262. PMID 17923675.
  • Complete description, history, place name and routes of Llullaillaco in Andeshandbook
  • Museum of High Mountain Archaeology Archived 4 October 2013 at the Wayback Machine (in Spanish)
  • "Llullaillaco". SummitPost.org.

External links edit

 
Wikimedia Commons has media related to Llullaillaco.

Reise durch die Wüste Atacama, auf Befehl der Chilenischen Regierung im Sommer 1853–54 unternommen. Anton. 1860.

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