Pica gap

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Pica gap is a segment in the

Central Volcanic Zone of Chile where volcanic activity is absent.[1] It is named after the Altos de Pica region.[2]

This segment is 100 kilometres (62 mi) long and extends between the volcanoes Isluga in the north and Irruputuncu in the south.[1] Volcanoes in the gap are old, Miocene to Pliocene in age and are heavily eroded. Examples include Cerro Napa [sv], Cerro Cariquima and Cerro Tatjachura.[3]

At the latitude of the Pica gap, an underwater rise known as the

Peru-Chile Trench. It is unclear if the subduction of this rise is the cause for the lack of recent volcanism in the Pica gap.[3] The lack of volcanism in the Pica gap appears to be due to unfavourable mantle flow patterns, which prevent the ascent of magma.[4]

Geologically, the Pica gap lies between two

seismic velocity zone in the crust,[8] a symmetry plane of the Andes, the Salar de Uyuni basin behind the arc and the location of the actual bend in the Andes that is usually placed at the Arica Bend. These phenomena may be unrelated to the Pica gap, however.[3]

The

Sillajuhay, where geothermal activity and deformation of the ground were observed.[1]

References

  1. ^
    doi:10.1016/j.jvolgeores.2014.05.004
    .
  2. ^
    ISBN 9783642773532
    .
  3. ^
    Revista Geológica de Chile
    . 27 (2): 205–240.
  4. doi:10.1029/2021TC006879
    .
  5. ISSN 0091-7613
    .
  6. doi:10.1016/0377-0273(93)90043-q
    .
  7. doi:10.1016/s0031-9201(96)03261-x
    .
  8. S2CID 133920227
    .
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