Earth:Pocho volcanic field
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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 500 kilometres (310 mi) from the main Andes into the land behind the mountain chain.[1] This did result in a typical shallow slab chemistry of the Pocho rocks.[3] 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]
References
- ↑ 1.0 1.1 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.
- ↑ 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.
- ↑ 3.0 3.1 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.
- ↑ Ramos, Victor A.; Folguera, Andrés (2009-01-01). "Andean flat-slab subduction through time" (in en). Geological Society, London, Special Publications 327 (1): 31–54. doi:10.1144/SP327.3. ISSN 0305-8719. http://sp.lyellcollection.org/content/327/1/31.
- ↑ 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.
- ↑ 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.
- ↑ 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.
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