The emergence of an aerobic world: isotopic evidence for biogeochemical changes at the Archean-Proterozoic transition

有氧世界的出现：太古代-元古代过渡时期生物地球化学变化的同位素证据

• 批准号: 37334373
• 负责人: Professor Dr. Harald Strauß
• 金额: --
• 依托单位: Institut für Geologie und Paläontologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/37334373?language=en
• 关键词: emergence; aerobic; world; isotopic; evidence

Undoubtedly, the late Neoarchean and early Paleoproterozoic is a time window in Earth history, where our planet experienced a most extraordinary environmental change: the first major rise in atmospheric oxygen, likely changing existing biochemistries from anaerobic to aerobic. This point in time, termed the Great Oxidation Event, marks the onset of aerobic conditions in environments located at the Earth’s surface. Anaerobic processes vanished from the surface waters into still anoxic deep waters and/or into the sediment. Consequently, oceanic biochemistry progressively resembled that of the modern aerobic world, particular with respect to the recycling of organic matter. The rise in atmospheric oxygen was paralleled by an increase in oceanic sulphate abundance as a consequence of oxidative weathering on the continents. An increasing level of oceanic sulphate, in turn, must have stimulated its microbial turnover via sulphate reduction, with other forms of microbial sulphur cycling that likely followed. A detailed sulphur isotope record for this time interval will document this increasing importance of sulphur metabolism under changing environmental conditions.

毫无疑问，新太古代晚期和古元古代早期是地球历史上的一个时间窗口，在那里我们的星球经历了最不寻常的环境变化：大气中氧气的第一次重大上升，很可能将现有的生物化学从厌氧改变为有氧。这个时间点被称为大氧化事件，标志着地球表面环境中有氧条件的开始。厌氧过程从地表水消失，进入静止缺氧的深水和/或进入沉积物。因此，海洋生物化学逐渐类似于现代有氧世界的生物化学，特别是在有机物的循环方面。大气氧气的增加与海洋硫酸盐丰度的增加是大陆氧化风化的结果。反过来，海洋硫酸盐水平的增加必然通过硫酸盐还原刺激其微生物周转，随后可能会发生其他形式的微生物硫磺循环。这一时间间隔的详细硫同位素记录将证明在不断变化的环境条件下硫代谢的重要性日益增加。

项目成果

Isotopic evidence for a sizeable seawater sulfate reservoir at 2.1 Ga

• DOI: 10.1016/j.precamres.2011.10.013
• 发表时间: 2012
• 期刊: Precambrian Research
• 影响因子: 3.8
• 作者: M. Reuschel;V. Melezhik;M. Whitehouse;A. Lepland;A. Fallick;H. Strauss