Resolving sedimentary sulphur cycling during the Shunga Event (early Paleoproterozoic) with sulphur isotopes

用硫同位素解决顺加事件（古元古代早期）期间的沉积硫循环

• 批准号: 165992229
• 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: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/165992229?language=en
• 关键词: Resolving; sedimentary; sulphur; cycling; during

One of the key events during early Paleoproterozoic time is the deposition of unprecedented amounts of organic matter during the ca. 2000 Ma old Shunga Event. Autochthonous sedimentary organic matter, migrated pyrobitumen und petrified subaquatic oil spills characterize a thick sedimentary succession in the Onega Basin on the Fennoscandian Shield, NW Russia. Petrographic and geochemical evidence clearly indicates that the organic matter is being remineralized microbially via a diverse suite of aerobic and anaerobic pathways. Sulphur isotopic evidence suggests that microbial sulphur cycling, and most prominently bacterial sulphate reduction appears to be of prime importance but that it occurred under highly variable conditions. Resulting sedimentary sulphides display a wide textural spectrum, underlining temporal and spatial variability in the diagenetic realm. A qualitative and quantitative understanding of the Shunga event requires a firm assessment of its depositional and diagenetic history in order to unravel its importance for the evolution of the ocean-atmosphere system during the Archean-Proterozoic transition.

古元古代早期的关键事件之一是古元古代时期空前数量的有机质沉积。2000 Ma老Shunga事件。原地沉积有机质，迁移焦沥青和石化水下溢油的特点厚沉积序列在奥涅加盆地的芬诺斯堪的地盾，俄罗斯西北部。岩相学和地球化学证据清楚地表明，有机质是微生物通过一套不同的好氧和厌氧途径。硫同位素证据表明，微生物硫循环，最突出的细菌硫酸盐还原似乎是最重要的，但它发生在高度可变的条件下。由此产生的沉积硫化物显示了广泛的结构谱，强调在成岩领域的时间和空间的变化。定性和定量的了解Shunga事件需要一个坚定的评估其沉积和成岩的历史，以揭示其重要性的演变过程中的太古代-元古代过渡的海洋-大气系统。