Skip to content
Catholic Online Logo

By Catholic Online (NEWS CONSORTIUM)

9/3/2013 (1 year ago)

Catholic Online (www.catholic.org)

New data shakes up controversial theory about a big climate shift

A new scientific theory posits that a meteor or comet impact near Quebec tossed hot melted rock along North America's Atlantic Coast about 12,900 years ago. The new research shakes up a controversial theory about a big climate shift called the Younger Dryas, when Earth abruptly swung into a glacial period 12,900 years ago.

The spherules from sites in North America and Europe, thought to be evidence of Younger Dryas comet impacts, the researchers have since discovered, didn't come from outer space.

The spherules from sites in North America and Europe, thought to be evidence of Younger Dryas comet impacts, the researchers have since discovered, didn't come from outer space.

Highlights

By Catholic Online (NEWS CONSORTIUM)

Catholic Online (www.catholic.org)

9/3/2013 (1 year ago)

Published in Green

Keywords: Meteor, Canada, Younger Dryas, spherules, Quebecia terrane


LOS ANGELES, CA (Catholic Online) - Graphing the  traced the geochemical signature of the BB-sized spherules that rained down back to their source, scientists now claim that they originate from the 1.5-billion-year-old Quebecia terrane in northeastern Canada near the Gulf of Saint Lawrence.

Researchers say that at the time of the impact, the region was covered by a continental ice sheet, much like Antarctica and Greenland are today.

"We have provided evidence for an impact on top of the ice sheet," study co-author Mukul Sharma, a geochemist at Dartmouth College in Hanover says.

This shakes up the conventional wisdom about a big climate shift called the Younger Dryas, when Earth abruptly swung into a glacial period 12,900 years ago. The cooling had been previously attributed to a sudden shutdown in Northern Atlantic Ocean currents, which were the result of a big glacial lake flood out the St. Lawrence or Mackenzie Rivers.

Scientists in 2007 suggested that comet or meteor impacts or atmospheric fireballs triggered the Younger Dryas, though no crater of the right age has ever been found.

Sharma and his colleagues, analyzing the tiny particles from New Jersey and Pennsylvania, say they have never been accurately dated. The particles could be several thousands years older than the widespread glacial event.

"We are assuming they are Younger Dryas, but [dating] is one of the things that should be done better," Sharma says.

And geochemical tracers in the molten rock show it can't be traced back to a recently discovered impact crater near Quebec called Corossal crater, thought to be Younger Dryas-age.

The spherules from sites in North America and Europe, thought to be evidence of Younger Dryas comet impacts, the researchers have since discovered, didn't come from outer space. Sharma and his colleagues measured osmium isotopes in the melted rock and their surrounding sediment. Meteorites usually carry much more osmium than Earth rocks. But none of the spherules were extraterrestrial, Sharma said.

"Clearly these things were produced in an impact fireball, but we didn't find any evidence of meteorites," Sharma said.

---


Pope Francis: end world hunger through 'Prayer and Action'


2014 - Distributed by THE NEWS CONSORTIUM

Pope Francis Prayer Intentions for September 2014
Mentally disabled:
That the mentally disabled may receive the love and help they need for a dignified life.
Service to the poor: That Christians, inspired by the Word of God, may serve the poor and suffering.



Comments


More Green

Antarctic sea ice reaches record levels and why that's bad Watch

Image of Antarctic sea ice continues to expand by about 1.5 percent coverage every year. This trend has continued since 1979 and it thought to be driven by global warming.

By Marshall Connolly, Catholic Online (NEWS CONSORTIUM)

Research ships and other vessels traveling through Antarctic waters will have to be very careful this year because Antarctic ice has expanded rapidly, increasing the hazard to ships. LOS ANGELES, CA (Catholic Online) - An incredible quantity of sea ice has formed ... continue reading


Terrifying new discovery: Spinosaurus dinosaur was the largest predator ever to walk the Earth Watch

Image of The monster's most distinctive feature was a row of spines that created an enormous sail down the middle of its back. Scientists think it was used for display purposes rather than to trap heat or store fat.

By Catholic Online (NEWS CONSORTIUM)

Described as a cross between a Tyrannosaurus Rex, a crocodile and a whale, the Spinosaurus was the largest predator ever to walk the Earth . or swim in its rivers. A recent discovery, the fierce beast is the first dinosaur known to have been adapted to an ... continue reading


VIDEO: Amazing video catches volcanic eruption along with sonic boom Watch

Image of Mount Tavurvur is known as a rather active volcano, one that caused many deaths and covered a nearby town in ash in 1994.

By Catholic Online (NEWS CONSORTIUM)

Mount Tavurvur, a volcano in Papua New Guinea, erupted late last month on August 29, throwing ash high into the air and causing a shock wave and resultant sonic boom. Phil McNamara caught the rare sight while boating near the New Guinea coast. LOS ANGELES, CA ... continue reading


Sun spits STORM OF FIRE at Earth, will the northern lights be visible? Watch

Image of The Sun has an 11-year cycle of activity and is presently at its maximum for the current cycle.

By Marshall Connolly, Catholic Online (NEWS CONSORTIUM)

A powerful solar storm approaching Earth should not be a direct hit, removing much cause for alarm. On Wednesday, the Sun spewed an X1.6 class solar flare aimed right at Earth, but the bulk of the resulting coronal mass ejection appears on track to miss Earth, passing ... continue reading


Deforestation of the Amazon continues at an alarming rate despite Brazil's best policies Watch

Image of Illegal logging has become an incredibly large part of the deforestation problem.

By Catholic Online (NEWS CONSORTIUM)

The Brazilian government has released figures which reveal that destruction of the world's largest rainforest accelerated last year by 29%, totally reversing gains made since 2009. LOS ANGELES, CA (Catholic Online) - The figures were compiled from satellite data ... continue reading


Is it getting hot in here? Greenhouse gas levels hit historic highs Watch

Image of A new study has revealed that the level of greenhouse gases in the Earth's atmosphere have hit record highs, and suggest that the Earth is losing its ability to disperse the heat retaining gases.

By Catholic Online (NEWS CONSORTIUM)

Atmospheric temperatures have climbed much faster than scientists have expected and the amount of greenhouse gases in the atmosphere reached a record high last years according to new research published by the U.N.'s agency on meteorology. LOS ANGELES, CA ... continue reading


Where are the wildfires? Global warming theory says California should be in flames... Watch

Image of California ought to be in flames, but without late-summer thunderstorms to spark fires, the state simply remains dry.

By Marshall Connolly, Catholic Online (NEWS CONSORTIUM)

The Washington Times recently reported that a mild fire season in the Western US is disrupting the global warming narrative --a sort of inconvenient truth for climate change proponents. The article is certainly correct, the fire season is well below average, so far, ... continue reading


After decades of conservation, California's blue whale population may be back for good Watch

Image of A new study has shown that California's population of blue whales has recovered near pre-whaling levels.

By Catholic Online (NEWS CONSORTIUM)

A new study released by the University of Washington has revealed that California blue whales have made a remarkable comeback thanks to conservation efforts, and now are nearing 19th-century levels. LOS ANGELES, CA (Catholic Online) - This remarkable recovery makes ... continue reading


Humans damaging wild forests at 'alarming rate' Watch

Image of Intact forest landscapes are defined as areas that retain native biodiversity and contain no signs of fragmentation by logging and infrastructure such as roads, mining and oil or gas development.

By Megan Rowling, Thomson Reuters Foundation

The world's undisturbed forests are being degraded at an "alarming speed", researchers said on Thursday, as they released new analysis showing an area three times the size of Germany was affected by logging and infrastructure development in the last 13 years. ... continue reading


LARGEST DINO, EVER! 'Dreadnought' dinosaur declared largest mammal ever Watch

Image of One of the so-called titanosaurs, the immense, long-necked, plant-eating thunder lizards were the most massive beasts ever to plod the Earth's land surface.

By Catholic Online - (NEWS CONSORTIUM)

New fossils uncovered in Argentina represent the most complete giant sauropod dinosaur ever discovered. Scientists say they have 70 percent of the key bones needed to fully describe the fearsome prehistoric beast. Given the scientific name of Dreadnoughtus ... continue reading


All Green News

Newsletters

Newsletter Sign Up icon

Stay up to date with the latest news, information, and special offers

Daily Readings

Reading 1, Hebrews 5:7-9
7 During his life on earth, he offered up prayer and ... Read More

Psalm, Psalms 31:2-3, 3-4, 5-6, 15-16, 20
2 turn your ear to me, make haste. Be for me a ... Read More

Gospel, John 19:25-27
25 Near the cross of Jesus stood his mother and his ... Read More

Saint of the Day

Saint of the Day for September 15th, 2014 Image

St. Valerian
September 15: The massacre of the martyrs of Lyons with their bishop, St. ... Read More

Inform, Inspire & Ignite Logo

Find Catholic Online on Facebook and get updates right in your live feed.

Become a fan of Catholic Online on Facebook


Follow Catholic Online on Twitter and get News and Product updates.

Follow us on Twitter