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East Warburton Basin

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(Redirected from Warburton Basin) Hypothesised impact crater in South Australia

East Warburton Basin
East Warburton Basin is located in South AustraliaEast Warburton BasinLocation of impact structure in South Australia
Impact crater/structure
ConfidencePotential
DiameterApproximately 200 kilometres (120 mi)
Age360-300 Ma
ExposedNo
DrilledYes
Location
LocationSouth Australia
Coordinates27°12′45.79″S 139°40′04.39″E / 27.2127194°S 139.6678861°E / -27.2127194; 139.6678861
Country Australia
StateSouth Australia

The East Warburton Basin in South Australia is the site of a hypothesised large impact crater of the Carboniferous period (around 360-300 million years ago). The subterranean structure lies buried at a depth of ~4 km, and measures a minimum of 200 km in diameter. For comparison, the Chicxulub crater, which caused the Cretaceous–Paleogene extinction event, is about 180 km in diameter. The East Warburton crater is adjacent to the West Warburton crater, which is also around 200 km in diameter. Combined, they make up the largest known impact zone on Earth, but individually, are smaller than the largest in the world, the 300 km wide Vredefort impact structure in South Africa. The Warburton craters formed when an asteroid or comet, on a collision course with Earth, split into two main pieces and impacted the Australian continent, then part of the Gondwanan supercontinent.

Scientists proposed the impact formation through analysis of shocked quartz grains from the area after a circular anomaly appeared in seismic tomography studies of the region.

See also

28°00′S 140°30′E / 28°S 140.5°E / -28; 140.5

References

  1. Vast asteroid impact zone found in Australia AFP/Google News, 19 February 2013. Retrieved 15 May 2013.
  2. Glikson, Andrew. "World's largest asteroid impact site could be right here in Australia". The Conversation. Retrieved 1 November 2019.
  3. "Giant Asteroid Impact Scars Discovered in the Warburton Basin". Encyclopedia Britannica. Retrieved 1 November 2019.
  4. Glikson, Andrew Y.; Uysal, I. Tonguç; Fitz Gerald, John D.; Saygin, Erdinc (2013). "Geophysical anomalies and quartz microstructures, Eastern Warburton Basin, North-east South Australia: Tectonic or impact shock metamorphic origin?". Tectonophysics. 589: 57. Bibcode:2013Tectp.589...57G. doi:10.1016/j.tecto.2012.12.036.
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