Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs

[Carnos Jax]

https://news.slashdot.org/story/19/09/09...-dinosaurs

wrote:
Drilling into the seafloor off Mexico, scientists have extracted a unique geologic record of the single worst day in the history of life on Earth, when a city-sized asteroid smashed into the planet 65 million years ago, wiping out the dinosaurs and three-quarters of all other life. Their analysis of these new rock samples from the Chicxulub crater, made public Monday, reveals a parfait of debris deposited in layers almost minute-by-minute at the heart of the impact during the first day of a global catastrophe (Warning: source paywalled; alternative source). It records traces of the explosive melting, massive earthquakes, tsunamis, landslides and wildfires as the immense asteroid blasted a hole 100 miles wide and 12 miles deep, the scientists said. The sediments also offer chemical evidence that the cataclysm blew hundreds of billions of tons of sulfur from pulverized ocean rock into the atmosphere, triggering a global winter in which temperatures world-wide dropped by as much as 30 degrees Fahrenheit for decades, the scientists said.
"The asteroid blasted a cavity between 25 and 30 miles deep in the first seconds of impact, creating a boiling cauldron of molten rocks and super-heated steam," reports The Wall Street Journal, citing the scientists' interpretation of the rock. "Rebounding from the hammer blow, a plume of molten rock splashed up into a peak higher than Mount Everest. Within minutes, it collapsed into itself, splashing gigantic waves of lava outward that solidified into a ring of high peaks, the scientists said."

"About 20 minutes or so later, sea water surged back over the newly formed peaks, covering them in a blanket of impact rocks, the scientists said. As minutes became hours, waves choked with shards of volcanic glass and splintered rock rippled back and forth, coating the peaks in a layer of impact rock called suevite, the scientists said. As the hours passed, the backwash of waves added more and more finely graded debris. At the very top of the rock core, the scientists detected traces of organic matter and charcoal."

The study was published today in the journal PNAS.

[Carnos Jax]

What a bad day that was.

[mikebw]

And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.

[Mike Sellers]

wrote:
... 65 million years ago..."

Probably a Monday.

[NewtonMP2100]

......'roid.....rage.....??

[ztirffritz]

mikebw wrote:
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.

We need to remember that humans will not be able to live on any other planet unsupported by Earth for a LONG time. Elon's plan is ambitious, but achievable, but it still requires an umbilical cord for supplies from earth and will for decades, if not centuries.

[tuqqer]

I spilled my coffee this morning, and I thought I had problems.

[sekker]

And yet, without this massive reshuffling of life on Earth, there would be no large mammals like us.

Thanks, Mr Asteroid!

EDIT- yes, a guy. Move reasons why to the other side!

[rgG]

If it happens again, I want to be at ground zero. Get it over with. Can’t imagine how awful it would be.

[mikebw]

sick burn