Did natural fission of^(235)U in the earth lead to formation of the supercontinent Columbia?

作     者：John J.W.Rogers 

作者机构：Department of Geological SciencesUniversity of North Carolina at Chapel HillChapel HillNC 27599-3315USA 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2012年第3卷第4期

页      面：369-374页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

主　　题：Natural fission Archean Paleoproterozoic Columbia supercontinent Tectonics 

摘      要：Steady decline in the percentage of 235U in terrestrial uranium made natural fission impos- sible after about 1.8 Ga. Fission before 1.8 Ga disturbed the lead isotope system at various places world- wide, 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 Paleoproter- ozoic UHT belts. The oldest widespread orogenic systems formed at approximately 2.0-1.8 Ga after fission stopped contributing to the earth＇s heat flow. These early orogenic systems partly created the supercontinent Columbia.