Abstract
Steady decline in the percentage of 235U in terrestrial uranium made natural fission impossible after about 1.8Ga. Fission before 1.8Ga disturbed the lead isotope system at various places worldwide, such as Oklo, Gabon, and may have caused the first lead isotope paradox. Fission in areas of high uranium concentration may also have generated enough heat to localize sparse Archean and Paleoproterozoic UHT belts. The oldest widespread orogenic systems formed at approximately 2.0–1.8Ga after fission stopped contributing to the earth’s heat flow. These early orogenic systems partly created the supercontinent Columbia.
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