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- Q2997213 subject Q7289166.
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- Q2997213 abstract "Cordón Puntas Negras is a 500 km2 (193 sq mi) volcanic chain located east of the Salar de Atacama in Chile's II Region.Cordón de Puntas Negras is constructed along the major Calama–Olacapato–El Toro fault and is 70 kilometres (43 mi) long. The volcanic chain intersects with the Cordón Chalviri volcanic chain. Both chains cover a surface area of 500 square kilometres (190 sq mi) and contain cones, vents, lava domes, lava flows and maars, including a lava dome and silicic flow with a surface area of 13 square kilometres (5.0 sq mi). Puntas Negras specifically covers an area of 400 square kilometres (150 sq mi), which runs from the Chiliques volcano on the north to volcán Puntas Negras (5,852 m (19,199 ft)) almost to the SE. The Puntas Negras Volcano forms the common endpoint of two chains of volcanoes in a V-shaped configuration. The southern leg of the V is called "Cordón Chalviri" whose other extreme is the Cerro Tuyajto, SW of Puntas Negras and at the same distance SE of the Miñiques volcano. Several small volcanic centres and lava flows are found here, including Aguas Calientes, Cerros Cenizas, Chinchilla and Laguna Escondida which have well preserved craters.Rocks in the chain are andesite, basaltic andesite and dacite. Magmas from this volcanic chain have a calc-alkaline composition formed by partial melting of a mantle wedge, with research indicating a decrease in SiO2 concentration over time.The basement beneath the chain is composed from Ordovician marine sediments that were later deformed by the Acadian orogeny. The 35 by 70 kilometres (22 mi × 43 mi) La Pacana caldera is buried beneath Puntas Negras. The 2.4 ± 0.4 mya Pampa Chamaca or Tuyajto ignimbrite from La Pacana may have been erupted from beneath Puntas Negras.Biotites in andesitic lavas have been dated 0.7 ± 0.3 to 0.3 ± 0.2 million years ago. Volcan Puntas Negras has generated postglacial lava flows. An olivine basalt flow from the northern part of the chain extends over 10 kilometres (6.2 mi) towards Salar el Laco and may be of late Holocene age. The youngest volcanic centre appears to be located southeast of Laguna Escondida. A zone of anomalous electrical conductivity down to depths of 6 kilometres (3.7 mi) extends north to Lascar volcano. Cerro Overo at the southeastern end of Puntas Negras has been undergoing active deformation, with a previously observed pattern of subsidence before 2003-2005 switching to a pattern of inflation. Filling and emptying of a magma reservoir linked to Puntas Negras may be the cause for these deformation patterns.The volcanic chain forms a water divide in the Andes, separating the Puna de Atacama from the basins Laguna Miscanti and Laguna Miniques. A catchment area of 320 square kilometres (120 sq mi) for the Laguna Miscanti lies in the Cordón de Puntas Negras. Puntas Negras has been affected by glaciation during the Pleistocene, with moraines reaching up to 4,400 metres (14,400 ft) altitude. Possibly, the entire chain was covered with glaciers.".
- Q2997213 elevation "5852.0".
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- Q2997213 elevationM "5852".
- Q2997213 location Q298.
- Q2997213 name "Cordón Puntas Negras".
- Q2997213 range Q5456.
- Q2997213 type "Stratovolcanoes".
- Q2997213 point "-23.74277777777778 -67.53416666666666".
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- Q2997213 comment "Cordón Puntas Negras is a 500 km2 (193 sq mi) volcanic chain located east of the Salar de Atacama in Chile's II Region.Cordón de Puntas Negras is constructed along the major Calama–Olacapato–El Toro fault and is 70 kilometres (43 mi) long. The volcanic chain intersects with the Cordón Chalviri volcanic chain.".
- Q2997213 label "Cordón de Puntas Negras".
- Q2997213 lat "-23.74277777777778".
- Q2997213 long "-67.53416666666666".
- Q2997213 depiction Puntas_negras_volcanic_complex_chile_ii_region.jpg.
- Q2997213 name "Cordón Puntas Negras".