The strange kind of dichromatic glass found in some desert regions of the world has finally confirmed its mysterious origin – about 30 million years after it was formed on Earth.
Libyan desert is a naturally occurring glass found in eastern Libya and eastern Saharan desert in western Egypt. The rare yellow was used as a decoration dating back to the Tutankhamun period, but the desert glass was much older.
This strange glass formation dates back to about 29 million years ago, but it is not at all clear what power has brought material to Earth, even though two key hypotheses have dominated the dialogue.
"It was the subject of constant controversy about whether asteroids in the Earth's atmosphere would explode in the Earth's atmosphere and accumulate energy or collide with the meteorites that occur when the glass is formed in the windshield," said geologist and planetary scientist Aaron Cavosie He says. Curtin University of Australia.
According to Cavosie, previous modeling suggests that the glass of the Libyan desert can form in an air blast as well as a dramatic Chelyabinsk explosion in Russia in 2013.
But new research gives us a "definite proof" from the outset that this may not be obvious.
In a new study, Cavosie investigated small particle mineral zircons buried in Libyan desert glass samples. This analysis showed traces of another mineral called reidite at high pressure, but only at meteor collisions not found in air storms but only in impact meteorites.
"Both meteorite impacts and air explosions can cause melting, but only meteorite impacts generate shock waves that form high pressure minerals," Cavosie says.
"So finding the evidence of former talents confirms that it was created as a result of meteorite clashes."
According to the researchers, isotope identification does not help close the book on how the glass of ancient deserts came about.
In addition, since no evidence of air explosion-related glass deposits in the last five million years has been identified with regard to geological records, it is possible to clarify how often the destructive shock wave generation with NEO occurs on Earth.
We know now that a much more rare and important meteor impact event can produce the Libyan desert glass, so it will be another wondrous era when yellow matter can be fused again on earth.
"The meteor impact is a catastrophe, but it is not common," says Cavosie.
"Air busts occur more often, but we now know that the glass-forming event of the Libyan desert is not expected in the near future, which is a source of comfort."
The results geology.