The Ora Caldera is a Permian supervolcano in the Southern Alps of northern Italy.[1] This 42-kilometre-wide (26 mi) and 40-kilometre-long (25 mi) caldera was formed by a supereruption 277–274 million years ago that produced more than 1,000 km3 (240 cu mi) of rhyodacitic-rhyolitic ignimbrite.[1][2][3] The ignimbrite from this eruption forms the 10-to-1,350-metre-thick (33 to 4,429 ft) Ora Formation, which represents the youngest eruptive unit of the Athesian Volcanic Group.[1][3]

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References

  1. 1 2 3 Willcock, M.A.W.; Cas, R.A.F.; Giordano, G.; Morelli, C. (2013). "The eruption, pyroclastic flow behaviour, and caldera in-filling processes of the extremely large volume (> 1290 km3), intra- to extra-caldera, Permian Ora (Ignimbrite) Formation, Southern Alps, Italy". Journal of Volcanology and Geothermal Research. 265: 102–126. Bibcode:2013JVGR..265..102W. doi:10.1016/j.jvolgeores.2013.08.012. Retrieved 2022-06-29.
  2. ↑ "The eruption, pyroclastic flow behaviour, and caldera infilling processes of the large volume (>1000 km3), Permian Ora (Ignimbrite) Formation (Italy)". Retrieved 2022-06-29.
  3. 1 2 "Ora Caldera". Retrieved 2022-06-29.

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