Maniitsoq impact crater
The team of researchers, led by Danish geologist Adam Garde, drew its conclusions from a study of Greenland's rocks which turned up a number of unexpected features. These include crushed rocks over a large circular area, deposits of a mineral called K-feldspar which must once have been liquid at a very high temperature, and signs of weathering by hot water, indicative of a massive in-rush of seawater after the impact.
If the claim by Garde's team is upheld by future work, this will be easily the biggest and most ancient of the 180 or so impact craters known on Earth, taking the records previously held by the Vredefort crater in South Africa, which is about 300 kilometers (186 miles) across and estimated to be 2 billion years old.
The results are published in the July 2012 issue of Earth and Planetary Science Letters.
Related categories• CRATERS
GEOLOGY AND PLANETARY SCIENCE
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