
The high temperatures of the meteorite impact 12,900 years ago produced mm-sized spherules of melted glass with the mullite and corundum crystal structure shown here.
Scientists have traced the geochemical signature of the BB-sized spherules that rained down back to their source, the 1.5-billion-year-old Quebecia terrane in northeastern Canada near the Gulf of Saint Lawrence.
At the time of the impact, the region was covered by a continental ice sheet, like Antarctica and Greenland are today.
"We have provided evidence for an impact on top of the ice sheet," said study co-author Mukul Sharma, a geochemist at Dartmouth College in Hanover, N.H. The results were published today (Sept. 2) in the journal Proceedings of the National Academy of Sciences.
Comment: Interesting. Two years ago, this happened:
Chile's Atacama Desert hit with record snowfall
Last year this happened:
Record-breaking blizzards and record-breaking flash-flooding in the 'driest, hottest place on Earth' for three years in a row: Man-made global warming in action... or another sign that we're headed into an Ice Age?