Ancient mass extinction was preceded by a drop in a crucial trace element. According to a recent study from Florida State University, a major extinction event around 183 million years ago was preceded by a fall in the element molybdenum across Earth's oceans. The decline shows that significantl
Ancient mass extinction was preceded by a drop in a crucial trace element., a major extinction event around 183 million years ago was preceded by a fall in the element molybdenum across Earth’s oceans.
In order to answer those questions, the scientists examined rocks from three locations in Alberta, Canada, which had formerly been a part of a large ocean that encircled the ancient continent of Pangea. Because the site was linked to the global ocean, the researchers could infer conditions across the entire globe instead of only a particular basin.
Just like 183 million years ago, more and more carbon dioxide is being added to the Earth system today, which could reduce marine trace metals such as molybdenum that many organisms rely on for survival as the oceans lose oxygen and bury more organic carbon. After the ancient extinction event, global conditions gradually became more hospitable to life, but that process took hundreds of thousands of years.
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