Drilling Into the Chicxulub Crater, Ground Zero of the Dinosaur Extinction

[Judi Lynn]

Drilling Into the Chicxulub Crater, Ground Zero of the Dinosaur Extinction

Trilobites

By NICHOLAS ST. FLEUR NOV. 17, 2016





An artist’s impression of what the Chicxulub crater might have looked like soon after an asteroid struck the Yucatán Peninsula in Mexico. Researchers studied the peak rings, or circular hills, inside the crater.[font size=1] Credit Detlev van Ravenswaay/Science Source [/font]


Some 66 million years ago an asteroid crashed into the Yucatán Peninsula in Mexico, triggering the extinction event that obliterated the dinosaurs and nearly extinguished all life on Earth. It struck with the same energy as 100 million atomic bombs, and left behind a 100-mile-wide scar known today as the Chicxulub crater.

Now, a team of geophysicists has drilled into the gigantic cavity under the Gulf of Mexico, targeting a circular series of hills called a peak ring located at its center. What they discovered illustrates that powerful impacts can catapult materials buried deep in a planet’s crust much closer to its surface.

“Chicxulub is the only crater on Earth with an intact peak ring that we can go sample, the next intact peak ring would be on the moon,” said Sean P. S. Gulick, a marine geophysicist from the University of Texas at Austin. “It’s ground zero of the Cretaceous extinction event.”

Dr. Gulick and his colleague Joanna Morgan, a geophysicist from Imperial College London, led a team of more than 30 researchers representing 12 countries to drill into the Chicxulub crater. By drilling into stone beneath the ocean’s surface, they discovered that the peak rings were made of granite, which is usually found much deeper in Earth’s crust. They concluded that the asteroid impact was so strong it lifted sediment from the basement of Earth’s crust several miles up to its surface.

More:
http://www.nytimes.com/2016/11/18/science/chicxulub-crater-dinosaur-extinction.html?_r=0

Science:
http://www.democraticunderground.com/122849716

[MFM008]

1. Interesting

Thanks.