Molecular and organic carbon isotopic evidence for the evolution of key metabolic pathways during the Archean-Proterozoic transition

太古代-元古代过渡期间关键代谢途径演化的分子和有机碳同位素证据

• 批准号: 114257623
• 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: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/114257623?language=en
• 关键词: Molecular; organic; carbon; isotopic; evidence

A sequence of events defines Earth’s irreversible oxygenation some 2.35 Ga ago: the first substantial rise in atmospheric oxygen abundance and a subsequent increase in oxidative continental weathering and corresponding riverine delivery of dissolved oxidized compounds (e.g. sulphate) into oxic marine surface waters. In contrast, deep waters remain anoxic; they were either ferruginous or even sulphidic. As a consequence of these profound changes in the redox structure of the sedimentary realm, the entire microbial network from autotrophic carbon fixation to heterotrophic carbon recycling must have changed as well, both in respect to diversity and position in the environment. Characteristic carbon isotope values archive the operation of respective biologically mediated processes. Even more diagnostic are organic molecules, biomarkers for individual organisms, metabolic pathways or environmental conditions. Temporal and spatial changes in biogeochemical carbon turnover across the Archean-Proterozoic transition and as a result of Earth’s oxygenation will be reconstructed via a systematic survey of organic carbon isotopes and detailed biomarker work for selected stratigraphic intervals.

一系列事件定义了地球在2.35 Ga前的不可逆氧化作用：大气中氧丰度的首次大幅上升，随后氧化大陆风化作用的增加，以及溶解的氧化化合物（如硫酸盐）向含氧海洋表面沃茨的相应河流输送。相比之下，深水沃茨仍然是缺氧的;它们要么是含铁的，要么甚至是硫化物的。由于沉积领域氧化还原结构的这些深刻变化，从自养碳固定到异养碳循环的整个微生物网络也必须发生变化，无论是在多样性还是在环境中的位置。特征碳同位素值存档各自的生物介导的过程的操作。更有诊断价值的是有机分子、个体生物的生物标志物、代谢途径或环境条件。通过对选定地层间隔的有机碳同位素和详细生物标志物工作进行系统调查，将重建太古代-元古代过渡时期地球化学碳周转的时空变化以及地球氧化作用的结果。

项目成果

Airborne hydrocarbon contamination from laboratory atmospheres

• DOI: 10.1016/j.orggeochem.2014.07.006
• 发表时间: 2014-11
• 期刊: Organic Geochemistry
• 影响因子: 3
• 作者: C. J. Illing;C. Hallmann;K. E. Miller;R. Summons;H. Strauss