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Researchers have discovered evidence that Earth's continents were formed through impact with giant meteorites.Earth's continents were formed by large meteorite impacts, which were particularly common during the planet's first billion years of existence. This is the strongest evidence yet that our planet was formed by these meteorites.
In an article published in Nature on August 10, 2022, Curtin University researchers conducted the study. Despite decades of debate, Dr. Tim Johnson, professor of earth sciences at Curtin University, says that the continents are believed to have formed as a result of giant meteorite impacts. However, until now, there has been little strong evidence to back this hypothesis.
We discovered evidence of these giant meteorite impacts by studying zircon crystals in rocks from Western Australia's Pilbara Craton, Earth's best-preserved ancient crust remnant.
“In these zircon crystals, oxygen isotope analysis revealed a 'top-down' process, that begins with the melting of rocks near the surface, and continues to progress downward. This is consistent with the geological effect of a giant meteorite impact.
“Our research shows that the processes that led to the formation of the continents began billions of years before the extinction of the dinosaurs, which were created by gigantic meteorite impacts.
Since these landmasses harbor most of Earth's biomass, all humans, and almost all of the planet's minerals, it is crucial to understand the formation and ongoing evolution of the continents, according to Dr. Johnson.
Moreover, the continents have critical metals like lithium, tin, and nickel, which are essential to emerging green technologies, which are required to mitigate global warming, Johnson says.
The Pilbara Craton is one of many landmasses that were formed during crustal differentiation, which is responsible for these mineral deposits.We would like to test our findings on ancient rocks found in other continents to determine if our model applies more widely, as we suspect, to all ancient continental crusts on Earth.'
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