The world’s oldest impact crater may not actually be a crater

Meteorites and comets have captured the public imagination for centuries. They inspire awe when we see them shoot across the night sky ‘ and terror at the thought that maybe, just maybe, one of them will collide with our planet.

After all, scientists believe that a meteor or comet hitting Earth wiped out the dinosaurs 66 million years ago.

Yet that was far from the first large rock to collide with our world. Since 2012, some scholars have embraced the hypothesis published by scientists in the journal’Earth and Planetary Science Letters’that Earth’s oldest impact crater ‘ the geological feature that forms when a smaller’object from space collides with a larger one ‘ was’the 62-mile’wide Maniitsoq structure in Greenland. If this supposition was accurate, that would mean that Earth suffered from an impact roughly 3 billion years ago.

Publisher: Salon
Date: 2021-03-14 12:00:02
Twitter: @Salon
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The world’s oldest impact crater may not actually be a crater

As the authors of the paper explain, many of the features of the’Maniitsoq structure that early scientists thought meant it was an impact crater can be explained through other natural processes. For instance, the’magnetic anomaly associated with the crater was originally believed to be evidence for’a collision. They also argued that some of the rocks seemed to have been smashed by a major impact and that there were abnormal crystal structures.

The new paper notes, however, that the magnetic anomaly may be an illusion, and disappears when viewed’at a larger scale. As for some of the other supposedly odd rock formations? One of the co-authors behind the paper believes they aren’t unusual at all.

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The world’s oldest crater from a meteorite isn’t an impact crater after all

Several years after scientists discovered what was considered the oldest crater a meteorite made on the planet, another team found it’s actually the result of normal geological processes. During fieldwork at the Archean Maniitsoq structure in Greenland, an international team of scientists led by the University of Waterloo’s Chris Yakymchuk found the features of this region are inconsistent with an impact crater. In 2012, a different team identified it as the remnant of a three-billion-year-old meteorite crater.

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‘World’s oldest impact crater’ isn’t an impact crater at all! 62-mile

The ‘world’s oldest impact crater’ ‘ the vast Maniitsoq structure that lies on the coast of west Greenland ‘ is actually nothing of the sort, geologists have claimed.

In 2012, an international team of researchers proposed that the 62 mile (100 kilometre) -wide structure was formed by a giant impact some 3 billion years ago.

There is no crater-shaped bowl in Maniitsoq. This, the researchers argued, eroded away, as the present surface was buried 14 miles down at the time of the impact.

Publisher: Mail Online
Date: 2021-03-11T17:46:39+0000
Author: Ian Randall
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Suspicions on True Origin of World’s Oldest ‘Impact Crater’ Have Now Been Confirmed

Earth and giant meteorites go way back, but new research confirms that what had been proposed as the oldest impact crater on the planet ‘ the 100-kilometer (62-mile) wide Maniitsoq structure ‘ isn’t actually an impact crater at all.

Through a combination of field mapping, rock dating, and geological chemical analysis techniques, researchers have been able to show that features previously argued to be the faint signature of a long-eroded crater were anything but. The alleged structure is as much the product of the same geological processes as those that created the surrounding region.

Publisher: ScienceAlert
Author: David Nield
Twitter: @ScienceAlert
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Canadian-led team disproves ‘world’s oldest crater’ discovery in Greenland

‘TORONTO, Ontario (CTV News) ‘ A Canadian-led international team of scientists have disproven what was thought to be the discovery of the ‘world’s older crater’ from a meteorite in Greenland in 2012.

The findings, published in the March issue of ‘Earth and Planetary Science Letters,’ detail that during fieldwork at the Archean Maniitsoq structure in Greenland, the scientists ‘ led by the University of Waterloo’s Chris Yakymchuk ‘ found that the features of the region were ‘inconsistent with an impact crater,’ according to a press release.

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World’s oldest impact crater discovered in Greenland

This archived news story is available only for your personal, non-commercial use. Information in the story may be outdated or superseded by additional information. Reading or replaying the story in its archived form does not constitute a republication of the story.

Why did it take us so long to find something so massive? Because 3 billion years ago is a really, really long time and it’s mostly gone now due to age and erosion. Being in one of the world’s coldest regions, the Maniitsoq region of Greenland, doesn’t make studying it any easier either. But scientists from Denmark, Wales, Russia and Sweden braved the cold for three years and are finally convinced that the crater in Greenland is the world’s oldest and one of the largest. Only the Vredefort crater in South Africa is larger, at 300 km, but is some 1 billion years younger than the Maniitsoq crater.

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Twitter: @kslcom
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