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A scarily large meteorite crater has just been discovered in Greenland. It hit the world with the force of , nuclear bombs. An artist's depiction of a large, iron-heavy meteor falling through Earth's atmosphere toward northwest Greenland. The discovery may reveal the cause of the mysterious disappearance of megafauna and early humans from North America. Picture: Science Source:Supplied. A massive iron meteorite smashed into Greenland as recently as 12, years ago, leaving a crater bigger than Paris that was recently discovered beneath the ice with sophisticated radar.
The impact which created the 31 kilometres wide crater under the Hiawatha Glacier would have had significant ripple effects in the region, possible even globally, researchers said.
If confirmed, it could have major implications for the tale of humanity itself. If confirmed, its dating could establish the Younger Dryas impact hypothesis as fact. This in turn lead to the extinction of many megafauna mammals, such as the mammoth and mastodons - and possibly the early humans then occupying the Americas.
The hidden crater stretches nearly 20 miles 31km wide. A prominent rim surrounds the depression.
It would have been a spectacle seen across much of the Northern Hemisphere - a huge fireball many times brighter than the Sun, streaking across the sky. The resulting impact would have flashed across North America - sending molten projectiles spearing into forests over thousands of square kilometres and setting off enormous fires. And then the tsunamis and clouds of vaporised ice and bedrock circled the globe.
The location of the Hiawatha crater, hidden under Greenland's icecap. Image: Google Earth Source:Supplied.
The impact would have been huge. But nowhere near as devastating as the dinosaur-killer strike that created the Chicxulub impact crater - some km wide - in Mexico some 66 million years ago.
The geomorphological and glaciological setting of Hiawatha Glacier, northwest Greenland. At the estimated rate of impacts on the Earth, it would not be extremely unusual [ citation needed ] for a Boltysh-sized crater to be formed within half a million years of Chicxulub.
The dating of these impact craters is not yet accurate enough to establish whether the impactors arrived thousands of years apart, perhaps as part of a generally elevated rate of impacts at that time, or were almost simultaneous, like the impacts of the fragments of Comet Shoemaker-Levy 9 on Jupiter in The discovery of the unconfirmed Silverpit crater and the early report of its age as million years  initially gave greater weight to the hypothesis that the Earth was struck by multiple impactors at this time, however, the age estimate has now been broadened to million years.
A probable impact crater  called Shiva crater is claimed to have formed around the same time, but its status as an impact crater is disputed. From Wikipedia, the free encyclopedia. Boltysh crater.
16 THE MOST VISUALLY IMPRESSIVE IMPACT CRATERS ON EARTH
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Feb 11, If the second crater, which has a width of over 22 miles, is ultimately confirmed as the result of a meteorite impact, it will be the 22nd largest impact crater found on marionfoaleyarn.com: Maria-Jose Vinas. The Chicxulub crater / ? t? i? k ? ? l u? b / (Mayan: [t??ik?ulu?]) is an impact crater buried underneath the Yucatan Peninsula in Mexico. Its center is located near the town of Chicxulub, after which the crater is named. It was formed when a large asteroid or comet about 11 to 81 kilometers ( to miles) in diameter, known as the Chicxulub impactor, struck the marionfoaleyarn.com: ± Ma, Cretaceous-Paleogene boundary. Nicholas Spiegler Category Crater Counting Lab Lab Write Up Crater counting is a method for estimating the age of a planet's surface. A new surface forms with no impact craters, and those craters that do appear, do so at a measurable rate. The method for counting craters has been based off of the surface of the moon. The process differentiates between significant impact craters and those.
Geological Society of America Bulletin. Bibcode : GSAB.
Cretaceous-Paleogene extinction event. To calculate the statistical likelihood that the two craters were created by unrelated impact events, MacGregor's team used recently published estimates that leverage lunar impact rates to better understand Earth's harder-to-detect impact record.
By employing computer models that can track the production of large craters on Earth, they found that the abundance of said craters that should naturally form close to one another, without the need for a twin impact, was consistent with Earth's cratering record.
Indeed, two pairs of unrelated but geographically close craters have already been found in Ukraine and Canada, but the ages of the craters in the pairs are different from one another.
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Greenland crater renewed the debate over an ancient climate mystery Scientists disagree on what the find means for a controversial comet-impact hypothesis. Dec 29, from impact craters in south. Interleaved impact rates to use for the age dating introduction impact glass by crater record of / Dec 29, over impact craters were formed when. Key words: impact crater counting, since the moon, low-sun. Jan 22, Now, however, researchers in Western Australia believe they've found the single oldest impact crater ever detected, dating to roughly billion years marionfoaleyarn.com: Brandon Specktor.
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Greenland impact crater could help explain disappearance of woolly mammoths, early humans A scarily large meteorite crater has just been discovered in Greenland. It hit the world with the force of.
3. IMPACT MELTS AND GLASSES. Impact melts and glasses (or minerals that have recrystallized from the melt; e.g., Krogh et al., ; Izett et al., ) have another important use, as they often are the most suitable material for the dating of an impact structure. The methods most commonly used for dating of impact melt rocks or glasses include the K-Ar, 40 Ar Ar, fission track, Rb-Sr, Sm. Impact Cratering Dating Nathan Marsh Relative Dating Simple but not as informative Measures the crater densities (craters per square kilometer) Generally a less cratered area is younger than a more cratered area Reference points in dating The Apollo and Luna missions analyzed specific dates on certain areas of the moon Late Heavy Bombardment craters Gy Light-toned Terrae (highlands. These ages are similar to that of Chicxulub Crater which argon dating yielded an age of ± million years. Radiometric dating places the Boltysh crater thousands of years after the Chicxulub crater, but an August study of ancient fern spikes suggests the Boltysh impact may have occurred several thousand years before marionfoaleyarn.comy: Ukraine.
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Dating impact crater
More information: Joseph A. MacGregor et al.
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