A team of researchers affiliated with institutions in Australia, the United States, and France found that relatively new evidence of water movement in meteorites has not collided with the Earth until recently.In their papers published in the journal scienceThe team described their research and findings on carbonaceous chondrite (CC) meteorites that have landed on the surface of the earth in the past century.
Many scientists believe that the water that exists on Earth comes from meteorites. It is difficult to prove this theory because the meteorites recovered so far do not contain water, and the chemical reaction that may involve comet water occurred millions of years ago. In this new work, the researchers looked at this idea from another angle-they studied the isotopes in meteorites that have landed on Earth in the past century.
Previous research has shown that most (if not all) CC meteorites formed about 4.5 billion years ago and are part of larger asteroids. To determine whether there is evidence of water history in the recent arrival, the researchers studied the distribution of uranium and or in the samples-the former is water-soluble, while the latter is not. Logic suggests that if water has ever existed in a meteorite, it must move when it melts, and this movement will be reflected in the distribution of th and uranium isotopes. Moreover, the half-lives of these two isotopes are very short, which means that if their distribution in meteorites can be found, they will occur in relatively new locations (approximately several million years).
While studying 9 meteorites, the researchers found the distribution they were looking for-which suggests that water may have flowed due to melting, most likely in the past 1
Study finds meteor evidence for previously unknown asteroids
Simon Turner, etc. In the past one million years, carbonaceous chondrites have experienced fluid flow, science (2021). DOI: 10.1126/science.abc8116
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Citation: Evidence of water movement was found in a meteorite that has only recently fallen to the earth (January 8, 2021) from https://phys.org/news/2021-01-evidence-movement-meteorites-fell-earth. html retrieved January 8, 2021.
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