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Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 11:05AM
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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.
Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 11:06AM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: mikebw
Date: September 10, 2019 11:16AM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Mike Sellers
Date: September 10, 2019 11:32AM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: NewtonMP2100
Date: September 10, 2019 11:33AM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: ztirffritz
Date: September 10, 2019 11:35AM
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mikebw
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.
Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: tuqqer
Date: September 10, 2019 11:39AM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: sekker
Date: September 10, 2019 12:14PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: rgG
Date: September 10, 2019 12:26PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: mikebw
Date: September 10, 2019 02:07PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Buck
Date: September 10, 2019 03:09PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:49PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: tuqqer
Date: September 10, 2019 03:49PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:53PM
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Quote
ztirffritz
Quote
mikebw
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.
Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:55PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Paul F.
Date: September 10, 2019 05:22PM
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Quote
ztirffritz
Quote
mikebw
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.
Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Lux Interior
Date: September 10, 2019 07:00PM
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: N-OS X-tasy!
Date: September 10, 2019 09:37PM
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