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- Q313635 subject Q20930392.
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- Q313635 abstract "Cordón del Azufre is a small, inactive complex volcano located on the Central Andes, at the border of Argentina and Chile. The centre contains series of craters and lava flows covering a surface area of 60 square kilometres (23 sq mi). A western component with four craters aligned in north-south direction on a 5 kilometres (3.1 mi) long ridge forms the oldest part. The eastern component is formed by lava flows and craters in Argentina, and the youngest part la Moyra volcano in the western component generated a lava flow that advanced 6 kilometres (3.7 mi) westwards. Weakly porphyritic Andesite and dacite form the rocks of the volcano. No activity, including fumarolic activity, has been recorded at Cordón del Azufre, but the appearance (dark and pristine) and radiometric age (0.3 ± 0.3 mya K-Ar on the most recent flow) of the lava flows suggest a recent age.It is located 300 kilometres (190 mi) east of the Chile Trench within the Puna where the volcanic arc intersects a probably deep seated structural area named the Archibarca corridor. Since the Eocene, underlying convergence and subduction of the Nazca plate at a speed of 6–7 centimetres per year (2.4–2.8 in/year) result in the volcanic activity of the Central Volcanic Zone (CVZ), the activity of fault zones and active deformation south of 23° S. Several large calderas lie in the CVZ, some of which (Galan, La Pacana) have erupted volumes of over 1,000 cubic kilometres (240 cu mi). The area is uninhabited and remote.Observations of this volcano and neighbouring Lastarria indicate that they are part of an actively deforming system, named by Pritchard and Simons (2002) the Lazufre system with an axis length of 70 kilometres (43 mi). The modelled centre of deformation is closer to Azufre than Lastarria. Sometimes Cerro Bayo Gorbea is also associated to this complex. This inflation started in the late 1990s and is probably due to the accumulation of volcanic fluids (hydrothermal or magmatic) beneath the volcanic system. The precise date when the uplift started is unclear, because satellite observation of the area is scarce. The start of the uplift may be related to an earthquake in Chile in 1998, but this is questionable. Aftershocks of the 1995 Antofagasta earthquake may be responsible instead. Between 1998 and 2000 the long axis of deformation amounted to 35 kilometres (22 mi), with a later increase to 50 kilometres (31 mi). In 2008 the area had already reached a diametre of c. 45 kilometres (28 mi) and surface area of 1,100 square kilometres (420 sq mi). In 2015 deformation was observed over a surface of 2,000 square kilometres (770 sq mi), at depths 2–18 kilometres (1.2–11.2 mi) and with speeds of 3 centimetres per year (1.2 in/year) until 2010. This uncertainty is largely because estimates trade off between depth, pressure and shape of the deformation. Since 2005 uplift speeds of 3.5 centimetres per year (1.4 in/year) have been observed with InSAR and a magma flux rate of 14,000,000–17,000,000 cubic metres per year (16,000,000–19,000,000 cu ft/Ms) has been inferred. Other research has indicated an inflation rate of 12,500,000–148,000,000 cubic metres per year (14,000,000–165,600,000 cu ft/Ms), comparable with other plutons in the area. One estimate in 2009 indicated a depth 12–15 kilometres (7.5–9.3 mi). Research in 2009 indicated that the deforming area has increased by about 8 kilometres per year (0.16 mi/Ms) laterally and covered almost 800 square kilometres (310 sq mi) (area uplifted by 1 centimetre (0.39 in) or more). The researchers concluded that sill fluid dynamics may explain the pattern of uplift and growth in the uplifting area but without major changes in the magma flux rate. Other data indicate that no lateral expansion may be taking place. A study in 2014 indicated that the source of the deformation is most likely elliptical and has a volume of 400 cubic kilometres (96 cu mi). The deformation pattern may be controlled by local tectonic stress patterns.This deformation system is among the largest on Earth. It has been compared to deformation occurring at Uturuncu volcano, but the deformation source beneath Lazufre has not been imaged due to resolution limitations. The size of the deformation area is comparable with the size of calderas such as Long Valley and Yellowstone. Likewise, such deformation patterns are mainly found in active caldera systems and in the case of Lazufre may be caused by the refilling of a magma chamber. The hydrothermal system of Lastarria may be influenced by the uplift, but it's not likely that hydrothermal effects are responsible for the Lazufre deformation. It is not clear whether this deformation is a signal of a future volcanic eruption, but monitoring has been recommended as it may be at risk of a major silicic eruption.".
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- Q313635 thumbnail Cordón_del_Azufre.jpg?width=300.
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- Q313635 elevationM "5481".
- Q313635 location Q298.
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- Q313635 name "Cordón del Azufre".
- Q313635 range Q5456.
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- Q313635 point "-25.333333333333332 -68.5".
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- Q313635 comment "Cordón del Azufre is a small, inactive complex volcano located on the Central Andes, at the border of Argentina and Chile. The centre contains series of craters and lava flows covering a surface area of 60 square kilometres (23 sq mi). A western component with four craters aligned in north-south direction on a 5 kilometres (3.1 mi) long ridge forms the oldest part.".
- Q313635 label "Cordón del Azufre".
- Q313635 lat "-25.333333333333332".
- Q313635 long "-68.5".
- Q313635 depiction Cordón_del_Azufre.jpg.
- Q313635 name "Cordón del Azufre".