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Coordinates: 23°44′S 67°47′W / 23.733°S 67.783°W / -23.733; -67.783
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Revision as of 19:15, 25 February 2018

Miscanti Lake
Laguna Miscanti.
LocationAntofagasta Region
Coordinates23°44′S 67°47′W / 23.733°S 67.783°W / -23.733; -67.783[1]
Catchment area303 km2 (117 sq mi)[2]
Basin countriesChile
Surface area13.4 km2 (5.2 sq mi)[2]
Surface elevation4,120 m (13,520 ft)[2]
References[1][2]

Miscanti Lake (Spanish: Laguna Miscanti) is a brackish water lake located in the altiplano of the Antofagasta Region, in northern Chile. Miñiques volcano and Cerro Miscanti tower over this lake. This heart-shaped lake has a deep blue color. The western shoreline of the lake is separated by less than 1 km from the drainage divide between the lake and the Salar de Atacama basins.[2] Laguna Miscanti basin also has a common boundary with Salar de Talar basin.

A lava flow from an eruption of Miñiques separated Miscanti Lake from Miñiques Lake.[3]

The lake is part of one of the seven sectors of Los Flamencos National Reserve.

Panoramic View of Laguna Miscanti

Geography and geology

Laguna Miscanti lies in the Central Andes[4] of Chile.[5] It is a 10 metres (33 ft) deep lake with[6] clear[7] brackish water which covers a surface area of 13.5 square kilometres (5.2 sq mi);[6] the lake has the shape of an arrowhead with a peninsula jutting from the northern shore.[5] The lake has a flat lakefloor that is subdivided into two basins by a lava flow.[8] In the Atacama Altiplano, Laguna Miscanti is among the biggest waterbodies.[9] The mountains Cerro Miscanti (5,622 metres (18,445 ft)) and Cerro Miniques (5,910 metres (19,390 ft)) lie northeast and south of the lake, respectively.[10]

1.5 kilometres (0.93 mi) south of[11] the lake lies another waterbody, Laguna Miniques.[12] In the past, the two lakes were connected, producing a large waterbody which has left beach terraces in the landscape[6] and whose water levels were about 20 metres (66 ft) higher than today.[13] The separation of the lakes probably occurred during the Pleistocene, when a lava flow erupted from Cerro Miniques split the lake basin in two.[14][15] A number of creeks enter into Laguna Miscanti from the north, east and south, and two springs can be found on its northern shores.[5]

Miscanti and Miniques occupy fault-bound basins,[11][6][16] which are controlled by the Quebrada Nacimiento fault and which developed during the Pliocene and Pleistocene;[13] Laguna Lejia also developed along this fault;[16] the fault segment there is also known as Miscanti-Callejon de Varela fault.[17] The fault is also known as the Miscanti Fault and is part of a detachment fault system east of the Salar de Atacama,[18] which separates the Western Cordillera from the Cordillera Domeyko.[16][7] This fault extends from the Purico complex,[19] Llano de Chajnantor to Cerro Miniques and has formed a ridge, which has dammed lava flows from Cerro Miscanti and Cerro Miniques.[15] Volcanoes[16] including Lascar is constructed on this fault,[20] and the Cerros Saltar and Corona north and south of Lascar are lined up along the fault.[21]

Hydrology

The catchment of the lake consists mainly of volcanic and sedimentary rocks ranging from Miocene to Holocene age and covers a surface area of 320 square kilometres (120 sq mi).[6] The Cordon de Puntas Negras is the principal source of water.[13] Water reaches Laguna Miscanti principally as groundwater,[7] which is directed there by the fault; this may explain why Laguna Miscanti is a permanent lake rather than a playa.[14]

The lake has no surface outflow. Presently, water seeps to Miniques through a lava flow[6] along the path of the Quebrada Nacimiento fault;[13] during former lake highstands a combined lake overflowed into the Pampa Varela basin[6] south-southwest of Miniques.[10] The main removal mechanism of water from Laguna Miscanti however is evaporation.[16] Some water is diverted from the catchment and forms a water supply to the town of Peine.[22]

Climate

Presently, the regional climate is arid[12] (average precipitation 200–250 millimetres per year (0.25–0.31 in/Ms)) and cold (average annual temperature 2 °C (36 °F)), leading to the development of ice on the lake surface during winter.[6] The lake area is usually a little warmer than the surrounding region.[23] The region lies between areas dominated by summer precipitation in the northeast and areas dominated by winter precipitation in the southwest.[12]

In the late Pleistocene and early Holocene the climate was much wetter and lakes expanded, while the middle Holocene was dry[12] as was the last glacial maximum.[24] The late Pleistocene-early Holocene wet period was particularly noticeable in the Altiplano, where two separate phases of the Lake Tauca occurred.[25] During the middle Holocene dry period, the lake may have dried up completely forming a bog.[7] Climate variability influenced human settlement in the region during the Holocene, which took place mainly during wetter periods[26] and became concentrated in several environmentally favourable spaces during dry periods.[11] An archeological site called "Miscanti-1" is found on the southeastern lake shore.[27]

Biology

Widgeonweed grows at the lakeshores.[28] Charophytes,[29] Chara and Myriophyllum are two further aquatic plants that have been identified in the lake. During its highstands, algal bioherms[28] and stromatolithes developed in the water.[13] Diatoms and ostracodes have been identified in the lake sediments,[30] and amphipods have been found in the lake waters.[31]

Meadows consisting of Fabiana, Festuca and Stipa chrysophylla grow around the lake, with sparser vegetation found on the upland. Fauna that inhabits the area includes birds like flamingos, horned coot, rhea and speckled teal, and mammals like the vicuña.[7] Laguna Miscanti and Laguna Miniques are part of the Los Flamencos National Reserve.[32]

References

  1. ^ a b Earth Info, earth-info.nga.mil webpage Archived 2012-05-04 at the Wayback Machine
  2. ^ a b c d e Template:Es icon Geoquímica de aguas en cuencas cerradas: I, II y III Regiones - Chile Archived 2011-07-21 at the Wayback Machine Laguna Miscanti
  3. ^ "Miñiques". Global Volcanism Program. Smithsonian Institution.
  4. ^ Grosjean 2001, p. 35.
  5. ^ a b c Valero-Garcés et al. 1996, p. 3.
  6. ^ a b c d e f g h Grosjean 2001, p. 37.
  7. ^ a b c d e Núñez et al. 2018, p. 112.
  8. ^ Valero-Garcés et al. 1996, p. 6.
  9. ^ Valero-Garcés et al. 1996, p. 2.
  10. ^ a b Grosjean 2001, p. 38.
  11. ^ a b c Núñez et al. 2018, p. 111.
  12. ^ a b c d Grosjean 2001, p. 36.
  13. ^ a b c d e Valero-Garcés et al. 1996, p. 4.
  14. ^ a b Valero-Garcés et al. 1999, p. 123.
  15. ^ a b González et al. 2009, p. 9.
  16. ^ a b c d e Valero-Garcés et al. 1999, p. 105.
  17. ^ Gardeweg, Sparks & Matthews 1998, p. 100.
  18. ^ Aron, Felipe; González, Gabriel; Veloso, Eugenio; Cembrano, José (2008). "Architecture and style of compressive Neogene deformation in the eastern-southeastern border of the Salar de Atacama Basin (22°30'-24°15'S): A structural setting for the active volcanic arc of the Central Andes" (PDF). 7th International Symposium on Andean Geodynamics: 52. Retrieved 25 February 2018.
  19. ^ Davidson, Jon P.; de Silva, Shanaka L.; Holden, Peter; Halliday, Alex N. (10 October 1990). "Small-scale disequilibrium in a magmatic inclusion and its more silicic host". Journal of Geophysical Research: Solid Earth. 95 (B11): 17662. doi:10.1029/JB095iB11p17661. ISSN 2156-2202.
  20. ^ Zellmer, Georg F.; Freymuth, Heye; Cembrano, José M.; Clavero, Jorge E.; Veloso, Eugenio A. E.; Sielfeld, Gerd G. (1 January 2014). "Altered mineral uptake into fresh arc magmas: insights from U–Th isotopes of samples from Andean volcanoes under differential crustal stress regimes". Geological Society, London, Special Publications. 385 (1): 189. doi:10.1144/SP385.9. ISSN 0305-8719.
  21. ^ Gardeweg, Sparks & Matthews 1998, p. 92.
  22. ^ Calderón, Matías; Benavides, Catalina; Carmona, Javier; Gálvez, Damián; Malebrán, Natalia; Rodríguez, Manuela; Sinclaire, Denise; Urzúa, José (2016). "GRAN MINERÍA Y LOCALIDADES AGRÍCOLAS EN EL NORTE DE CHILE: COMPARACIÓN EXPLORATORIA DE TRES CASOS". Chungará (Arica). 48 (2): 295–305. doi:10.4067/S0717-73562016005000001. ISSN 0717-7356.
  23. ^ Romero, Hugo; Kampf, Stephanie (2003). "Impacts of Climate Fluctuations and Climate Changes on the Sustainable Development of the Arid Norte Grande in Chile". Climate and Water. Springer, Dordrecht: 94. doi:10.1007/978-94-015-1250-3_5.
  24. ^ Grosjean 2001, p. 49.
  25. ^ Núñez et al. 2018, p. 109.
  26. ^ Valero-Garcés et al. 1996, p. 19.
  27. ^ Núñez et al. 2018, p. 110.
  28. ^ a b Grosjean 2001, p. 39.
  29. ^ Valero-Garcés et al. 1999, p. 117.
  30. ^ Valero-Garcés et al. 1996, p. 10.
  31. ^ Ríos-Escalante, Patricio De los; Morrone, Juan J.; Rivera, Reinaldo (1 January 2013). "A checklist of Hyalella (Amphipoda) from Chile". Crustaceana. 86 (12): 1429. doi:10.1163/15685403-00003256. ISSN 1568-5403 – via ResearchGate.
  32. ^ Aravena, Fernando; Amado, Nelson (May 2014). "Abundancia y reproducción de la tagua cornuda (Fulica cornuta) en la Reserva Nacional Los Flamencos, Región de Antofagasta" (PDF). Sistema de Información de Biodiversidad (in Spanish). Corporación Nacional Forestal. p. 29. Retrieved 25 February 2018.

Sources

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