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.

大约 2.35 Ga 之前的一系列事件定义了地球的不可逆氧化：大气中氧气丰度首次大幅上升，随后大陆氧化风化作用增加，以及相应的河流将溶解的氧化化合物（例如硫酸盐）输送到含氧海洋表层水中。深水仍然处于缺氧状态；由于沉积区氧化还原结构发生了这些深刻的变化，它们要么是铁质的，要么是硫化物的。从自养碳固定到异养碳回收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，特征碳同位素值都记录了各自生物介导过程的运作，更具有诊断性的是有机分子。通过对有机碳的系统调查，将重建太古代-元古代过渡期间生物地球化学碳周转以及地球氧化作用的结果的生物标志物、代谢途径或环境条件。同位素和详细的生物标志物适用于选定的地层区间。

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