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East Warburton Basin : ウィキペディア英語版 | East Warburton Basin The East Warburton Basin in South Australia is the site of a 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.〔(Vast asteroid impact zone found in Australia ) AFP/Google News, 19 February 2013. Accessed 15 May 2013.〕 For comparison, Chicxulub crater is about 180 km in diameter. Scientists identified the impact formation through analysis of shocked quartz grains from the area after a circular anomaly appeared in seismic tomography studies of the region.〔(Geophysical anomalies and quartz microstructures, Eastern Warburton Basin, North-east South Australia: Tectonic or impact shock metamorphic origin? ) ''Tectonophysics'' Vol. 589, 18 March 2013, Pp. 57–76. Accessed 15 May 2013.〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「East Warburton Basin」の詳細全文を読む
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