Changes in weathering, elemental cycling, bioproductivity and redox-conditions of shallow to deep marine environments during the Great Oxidation Episode

大氧化期间浅层到深层海洋环境的风化、元素循环、生物生产力和氧化还原条件的变化

• 批准号: 543675433
• 负责人: Professor Dr. Ronny Schönberg, Ph.D.
• 金额: --
• 依托单位: School of Earth and Environmental Sciences
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/543675433?language=en
• 关键词: Changes; weathering; elemental; cycling; bioproductivity

This project seeks to investigate feedback loops between modes and changes in continental weathering, elemental cycling from source to sink, bioproductivity and redox conditions of shallow to deep marine environments in response to the atmospheric oxygen build-up during the Great Oxidation Episode (GOE). The Pretoria Group of the Transvaal Basin in South Africa is an ideal archive for this study with an almost continuous sedimentary record of the GOE from the 2.32 Ga Timeball Hill Formation – which recently revealed repeated short-term cycling between slightly oxidized and reducing atmospheric conditions via changes between mass-dependent and mass independent fractionation of S isotopes (MDF-S and MIF-S, respectively) – up to the c. 2.08 Ga Magaliesberg Formation – which was deposited during the positive δ13Ccarb excursion of the Lomagundi Event, which has previously been interpreted as a time of oxygen overshoot to near-present O2 levels. Geochemical tools that will be used to retrieve this information are major- and trace element systematics combined with TOC, TN, TS and δ13Corg, δ13Ccarb as well as Fe-Mo-W stable isotope measurements. The project is planned for the duration of 36 months.

该项目旨在研究模式之间的反馈回路，以及连续风化的变化，从源到下沉到下沉的元素循环，生物生产力和浅水向深海洋环境的氧化还原条件，以响应在大氧化事件（GOE）期间对大气中的氧气积累的响应。南非Transvaal盆地的比勒陀利群是这项研究的理想档案，该研究的GOE几乎连续地记录了2.32 GA TimeBall Hill形成 - 最近揭示了通过质量依赖于质量相关的大气层和质量相关的S iSotopes（与S iSotopes之间的变化）在略有氧化和还原大气之间的短期循环（MIF）和MIF-SDF-SDF-SDFS和MIFS和MIF相应。 2.08 Ga Magaliesberg组 - 在Lomagundi事件的正δ13CCARB游览中沉积，该事件以前已被解释为氧过冲的时间到近乎出现的O2水平。将用于检索此信息的地球化学工具是主要和痕量元素系统，结合了TOC，TN，TS和Δ13CORG，Δ13CCARB以及Fe-Mo-W稳定的同位素测量。该项目计划在36个月的时间内进行。