Acraman
Coordinates: 32 ° 1 ′ S , 135 ° 27 ′ E
The Acraman Crater is a heavily eroded impact crater in South Australia .
Age and impact
The impact around 580 million years ago produced an impact structure with a diameter of around 90 kilometers, more than two thirds of which have already been eroded. The crater is located in the 1.5 billion year old volcanic rocks of the Gawler Ranges in South Australia. On islands in the central area of the impact structure found in heavily shattered Yardea- dacite traces of shock metamorphism ( shatter cones and shocked quartz ) and one occurrence of Impaktschmelzgestein . Ejecta from the Acraman Crater is known from the Bunyeroo Formation in the Flinders Ranges and in drill cores in the Officer Basin . Acraman Crater is the largest impact crater in Australia and the seventh largest in the world. The Acraman event could have had a decisive influence on the living world in the Ediacarium .
geography
Visually recognizable is the crater only through the Acraman salt lake of the same name and a circular depression in the volcanic rocks of the Gawler Ranges .
See also
Web links
- Acraman in the Earth Impact Database