Earth:Tastil volcanic complex
Template:Coord/display/intitle Tastil volcanic complex is a volcanic group in Argentina .
Subduction off the western coast of South America has been ongoing since the Jurassic[1] and beginning with the Oligocene led to volcanism in the Puna de Atacama region, which became particularly intense 10 million years ago.[2] Some of this volcanism was focused along faults that run perpendicular/diagonal to the subduction zone such as the Calama-Olacapato-El Toro fault; the volcanoes Cerro Tuzgle and Tastil volcanic complex are among them.[3]
The Tastil volcanic complex is constructed in the Eastern Cordillera, at the margin between a basement made by Precambrian-Cambrian sediments and plutons and Tertiary sediments.[4] The complex consists of dykes and lava flows which are of Miocene age.[5] The volcanic complex has erupted potassium-rich[6] calc-alkaline rocks[7] ranging from basaltic andesite to dacite;[5] isotope ratios in the rocks indicate a strong crustal influence in the geochemistry.[8]
References
- ↑ Matteini et al. 2002, p. 211.
- ↑ Matteini et al. 2002, p. 212.
- ↑ Matteini et al. 2002, p. 213.
- ↑ Matteini et al. 2002, p. 214.
- ↑ 5.0 5.1 Matteini et al. 2002, p. 215.
- ↑ Matteini et al. 2002, p. 219.
- ↑ Matteini et al. 2002, p. 218.
- ↑ Matteini et al. 2002, p. 224.
Sources
- Matteini, M.; Mazzuoli, R.; Omarini, R.; Cas, R.; Maas, R. (15 February 2002). "The geochemical variations of the upper cenozoic volcanism along the Calama–Olacapato–El Toro transversal fault system in central Andes (~24°S): petrogenetic and geodynamic implications". Tectonophysics 345 (1): 211–227. doi:10.1016/S0040-1951(01)00214-1. Bibcode: 2002Tectp.345..211M.
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