Tastil volcanic complex

24°45′S 65°53′W / 24.750°S 65.883°W / -24.750; -65.883[1] Tastil volcanic complex is a volcanic group in Argentina.

Subduction off the western coast of South America has been ongoing since the Jurassic[2] and beginning with the Oligocene led to volcanism in the Puna de Atacama region, which became particularly intense 10 million years ago.[3] 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.[4]

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.[5] The complex consists of dykes and lava flows which are of Miocene age.[1] The volcanic complex has erupted potassium-rich[6] calc-alkaline rocks[7] ranging from basaltic andesite to dacite;[1] isotope ratios in the rocks indicate a strong crustal influence in the geochemistry.[8]

References

  1. ^ a b c Matteini et al. 2002, p. 215.
  2. ^ Matteini et al. 2002, p. 211.
  3. ^ Matteini et al. 2002, p. 212.
  4. ^ Matteini et al. 2002, p. 213.
  5. ^ Matteini et al. 2002, p. 214.
  6. ^ Matteini et al. 2002, p. 219.
  7. ^ Matteini et al. 2002, p. 218.
  8. ^ 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. Bibcode:2002Tectp.345..211M. doi:10.1016/S0040-1951(01)00214-1.
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