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Mechanisms and climatic-ecological effects of the Great Oxidation Event in the early Proterozoic

Science China Earth Sciences 2022年第9期65卷 1646-1672页

作者： Genming LUO Xiangkun ZHU Shuijiong WANG Shihong ZHANG Chaoqun JIAO State Key Laboratory of Biogeology and Environmental Geology and School of Earth SciencesChina University of GeosciencesWuhan 430074China MNR Key Laboratory of Isotope Geology MNR Key Laboratory of Deep-Earth DynamicsInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China

This paper briefly introduces the conception and research history of the Great Oxidation Event(GOE) in the early Paleoproterozoic and summarizes the primary geological and geochemical records of this event. On the basis of these, we overview the significant progress in three fields of the GOE: the timing and process of its startup, its mechanisms, and its climatic-ecological effects. The records of mass-independent fractionation of sulfur isotopes suggest that the startup of the GOE might be multi-episodic, which is obviously inconsistent with the single-episodic opinion obtained from atmospheric model simulations. The fundamental mechanism of the GOE was the source of the atmospheric Oexceeding the sink, but it remains uncertain whether it was due to the increase in the source or the decrease in the sink. The GOE substantially affected the climate,biological evolution, and biogeochemical cycles, but the specific processes remain elusive. In consideration of the current progress, we propose four aspects for future explorations, including the construction of geological and geochemical proxies for extremely low atmospheric oxygen content(pO), how the GOE changed the evolutions of Earth’s habitability and the processes in deep Earth, and constraining the mechanism of the GOE by coupling geological events with different time scales.

关键词： Great Oxidation Event Proterozoic Paleoceanography mantle oxygen fugacity Biogeochemistry

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