The rock was formed about 36 million years ago by a meteorite impact.
scientists of Western University claim that a fist-sized rock discovered in Canada in 2011 was sculpted 36 millions of years ago at temperatures they reached 4,298 °F i.e. 2,370 °C, hotter than much of our planet’s mantle. Analysis of the rock revealed the presence of zircons, extremely resistant minerals that crystallize at high temperatures. The structure of the cubic zirconia can show how hot it was when they were formed. However, to confirm the initial results, researchers had to date more than one zircon. In the new study, the researchers analyzed four other zircons in samples from the crater. One was from a glassy rock formed on impact, two others from rock that had melted and resolidified, and one from a sedimentary rock containing fragments of glass formed on impact.
The results showed that the zircons of the impact glass formed at a minimum of 4,298°F, 2,370ºC. In addition, the glassy sedimentary rock was at 3,043 °F (1,673°C). The researchers also found a mineral called to repeat in the zircon grains from the crater. Reidites are formed when zircons are exposed to high temperatures and pressures, and their presence allows experts to calculate the pressures the rocks will experience on impact. The team of Western University determined that the pressures introduced by the impact in the range of 30 and 40 gigapascals, equivalent to 300,000-400,000 bar. This would have been the pressure at the impact edges, meaning that where the meteorite hits the crust directly, the rock would not only melt but vaporize. The study was published in the journal Earth and Planetary Science Letters.
Scientists Confirm Discovery of ‘Hottest Rock on Earth’ Sci-News.com