Earth Was Hit by A 15-Mile Asteroid 3.5 Billion Years Ago

Admin | Published 2016-09-17 10:02
Dr. Andrew Glikson and his fellow co-authors found fragments of glass beads named spherules from a drill core found in a volcanic Duffer Formation along Western Australia’s Pilbara region. The said fragments are discovered to be some of the oldest known sediments of the earth. The sediment layer, originally located on the ocean floor, was luckily preserved right between two volcanic blankets, which enabled it to have a precise date snapshot of its origin. Right away, the scientists suspected that the spherules came from an asteroid strike, subsequent tests revealed element levels such as nickel, platinum, and chromium have matched those also found in asteroids, Sci-News reports. Dr. Glikson says:
“The impact would have triggered earthquakes orders of magnitude greater than terrestrial earthquakes, it would have caused huge tsunamis and would have made cliffs crumble,” “Material from the impact would have spread worldwide. These spherules were found in sea floor sediments that date from 3.46 billion years ago.”
As of this writing, the asteroid is second to the oldest discovered to have hit our Earth and also one of the biggest. Dr. Glikson added that the asteroid must be 15 miles across and should have left a crater that is at least a hundred miles wide. Where exactly did this asteroid strike the earth is still remained to be solved. The crater left by the asteroid in question could have been easily disfigured by volcanoes and tectonic plate movements. The head scientist adds, “Any craters from this time on Earth’s surface have been obliterated by volcanic activity and tectonic movements.” There may have been any of these impacts of the same nature but still evidences haven’t been unveiled. To wrap up, Dr. Glikson expressed:
“This is just the tip of the iceberg. We’ve only found evidence for 17 impacts older than 2.5 billion years, but there could have been hundreds.” “Asteroid strikes this big result in major tectonic shifts and extensive magma flows. They could have significantly affected the way the Earth evolved.”
 
Hey! Where are you going?? Subscribe!

Get weekly science updates in your inbox!