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  • 21 Aug, 2019

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Pocho Volcanic Field
31°50′S 65°20′W / 31.833°S 65.333°W / -31.833; -65.333

Pocho volcanic field is a volcanic field in Argentina. It is associated with a crustal lineament known as the Ojo de Agua Lineament.

It is located in the Sierras de Cordoba mountain chain. It formed during the late Miocene, when a progressive shallowing of the subducting Nazca Plate caused volcanic activity to retreat 500 kilometres (310 mi) from the main Andes into the land behind the mountain chain. This did result in a typical shallow slab chemistry of the Pocho rocks. Volcanic activity at Pocho is dated about 4.7 +- 0.3 million years ago and took place over two cycles. Seismic activity in the area may indicate the presence of a residual magma chamber however, which would also explain anomalous crustal seismic velocities in the area.

References

  1. ^ Coira, B.; Kay, S. Mahlburg; Viramonte, J. (1993-08-01). "Upper Cenozoic Magmatic Evolution of the Argentine Puna—a Model for Changing Subduction Geometry". International Geology Review. 35 (8): 697. doi:10.1080/00206819309465552. ISSN 0020-6814.
  2. ^ Stern, Charles R. (2004-12-01). "Active Andean volcanism: its geologic and tectonic setting". Revista Geológica de Chile. 31 (2): 161–206. doi:10.4067/S0716-02082004000200001. ISSN 0716-0208.
  3. ^ Caro Montero, Ana; Martino, Roberto D.; Guereschi, Alina B. (January 2018). "Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina". Geodesy and Geodynamics. 9 (1): 90. doi:10.1016/j.geog.2017.10.001. hdl:11336/88737.
  4. ^ Jones, Rosemary E.; Kirstein, Linda A.; Kasemann, Simone A.; Litvak, Vanesa D.; Poma, Stella; Alonso, Ricardo N.; Hinton, Richard (2016-10-01). "The role of changing geodynamics in the progressive contamination of Late Cretaceous to Late Miocene arc magmas in the southern Central Andes". Lithos. 262: 169–191. doi:10.1016/j.lithos.2016.07.002. hdl:20.500.11820/93c1babf-4765-49fb-aa71-73c9410bb9e6.
  5. ^ Ramos, Victor A.; Folguera, Andrés (2009-01-01). "Andean flat-slab subduction through time". Geological Society, London, Special Publications. 327 (1): 31–54. CiteSeerX 10.1.1.1002.5325. doi:10.1144/SP327.3. ISSN 0305-8719. S2CID 43604314.
  6. ^ Caro Montero, Ana; Martino, Roberto D.; Guereschi, Alina B. (January 2018). "Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina". Geodesy and Geodynamics. 9 (1): 78–82. doi:10.1016/j.geog.2017.10.001. hdl:11336/88737.
  7. ^ Caro Montero, Ana; Martino, Roberto D.; Guereschi, Alina B. (January 2018). "Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina". Geodesy and Geodynamics. 9 (1): 90. doi:10.1016/j.geog.2017.10.001. hdl:11336/88737.
  8. ^ Ammirati, Jean-Baptiste; Venerdini, Agostina; Alcacer, Juan Manuel; Alvarado, Patricia; Miranda, Silvia; Gilbert, Hersh (August 2018). "New insights on regional tectonics and basement composition beneath the eastern Sierras Pampeanas (Argentine back-arc region) from seismological and gravity data". Tectonophysics. 740–741: 42–52. doi:10.1016/j.tecto.2018.05.015. hdl:11336/86785. S2CID 133702507.


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