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New evidence of a two billion years old oxygen disaster found in Karelia

The international team of scientists has found new evidence in Karelia of the oxygen disaster that occurred on Earth two billion years ago, informed Pavel Medvedev, Senior Research Fellow at the Institute of Geology of the Karelian Research Centre of the Russian Academy of Sciences, and one of the participants of the study.
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A well 3.5 km deep was drilled near Karelian Novinka settlement, Medvedev explained. A 800-meter sequence of rocks was extracted, which formed some 2.1 billion years ago. Scientists from Russia, the United States, Great Britain, Norway, and Estonia, under the guidance of Clara Bletler, a geochemist from Princeton University, investigated the minerals found to make out the dynamics of the chemical composition of air in the Paleoproterozoic era.

The scientists found a high content of sulphates, and came to a conclusion that the oxygen level increased sharply in a very short period of time — about 200−300 thousand years. Sulphates formed in water rich in oxygen.

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