Pocho volcanic field explained

Pocho volcanic field is a volcanic field in Argentina.^[1] It is associated with a crustal lineament known as the Ojo de Agua Lineament.^[2]

It is located in the Sierras de Cordoba mountain chain.^[3] It formed during the late Miocene, when a progressive shallowing of the subducting Nazca Plate caused volcanic activity to retreat 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^[4] and took place over two cycles.^[5] Seismic activity in the area may indicate the presence of a residual magma chamber however,^[6] which would also explain anomalous crustal seismic velocities in the area.^[7]

External links

• https://link.springer.com/article/10.1007%2FBF00307727?LI=true

Notes and References

1. Stern. Charles R.. 2004-12-01. Active Andean volcanism: its geologic and tectonic setting. Revista Geológica de Chile. 31. 2. 161–206. 10.4067/S0716-02082004000200001. 0716-0208. free.
2. Caro Montero . Ana . Martino . Roberto D. . Guereschi . Alina B. . Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina . Geodesy and Geodynamics . January 2018 . 9 . 1 . 90 . 10.1016/j.geog.2017.10.001 . free . 11336/88737 . free .
3. 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. 10.1016/j.lithos.2016.07.002. free. 20.500.11820/93c1babf-4765-49fb-aa71-73c9410bb9e6. free.
4. Ramos. Victor A.. Folguera. Andrés. 2009-01-01. Andean flat-slab subduction through time. Geological Society, London, Special Publications. en. 327. 1. 31–54. 10.1144/SP327.3. 0305-8719. 10.1.1.1002.5325. 43604314 .
5. Caro Montero . Ana . Martino . Roberto D. . Guereschi . Alina B. . Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina . Geodesy and Geodynamics . January 2018 . 9 . 1 . 78–82 . 10.1016/j.geog.2017.10.001 . free . 11336/88737 . free .
6. Caro Montero . Ana . Martino . Roberto D. . Guereschi . Alina B. . Anomalously deep earthquakes related to the Ojo de Agua Lineament and its tectonic significance, Sierras Pampeanas of Córdoba, Central Argentina . Geodesy and Geodynamics . January 2018 . 9 . 1 . 90 . 10.1016/j.geog.2017.10.001 . free . 11336/88737 . free .
7. Ammirati . Jean-Baptiste . Venerdini . Agostina . Alcacer . Juan Manuel . Alvarado . Patricia . Miranda . Silvia . Gilbert . Hersh . New insights on regional tectonics and basement composition beneath the eastern Sierras Pampeanas (Argentine back-arc region) from seismological and gravity data . Tectonophysics . August 2018 . 740-741 . 42–52 . 10.1016/j.tecto.2018.05.015 . 133702507 . 11336/86785 . free .