Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2107511118 |
Mercury abundance and isotopic composition indicate subaerial volcanism prior to the end-Archean “whiff” of oxygen | |
Jana Meixnerová; Joel D. Blum; Marcus W. Johnson; Eva E. Stüeken; Michael A. Kipp; Ariel D. Anbar; Roger Buick | |
2021-08-17 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2021 |
英文摘要 | Earth’s early atmosphere witnessed multiple transient episodes of oxygenation before the Great Oxidation Event 2.4 billion years ago (Ga) [e.g., A. D. Anbar et al., Science 317, 1903–1906 (2007); M. C. Koehler, R. Buick, M. E. Barley, Precambrian Res. 320, 281–290 (2019)], but the triggers for these short-lived events are so far unknown. Here, we use mercury (Hg) abundance and stable isotope composition to investigate atmospheric evolution and its driving mechanisms across the well-studied “whiff” of O2 recorded in the ∼2.5-Ga Mt. McRae Shale from the Pilbara Craton in Western Australia [A. D. Anbar et al., Science 317, 1903–1906 (2007)]. Our data from the oxygenated interval show strong Hg enrichment paired with slightly negative ∆199Hg and near-zero ∆200Hg, suggestive of increased oxidative weathering. In contrast, slightly older beds, which were evidently deposited under an anoxic atmosphere in ferruginous waters [C. T. Reinhard, R. Raiswell, C. Scott, A. D. Anbar, T. W. Lyons, Science 326, 713–716 (2009)], show Hg enrichment coupled with positive ∆199Hg and slightly negative ∆200Hg values. This pattern is consistent with photochemical reactions associated with subaerial volcanism under intense UV radiation. Our results therefore suggest that the whiff of O2 was preceded by subaerial volcanism. The transient interval of O2 accumulation may thus have been triggered by diminished volcanic O2 sinks, followed by enhanced nutrient supply to the ocean from weathering of volcanic rocks causing increased biological productivity. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/335821 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Jana Meixnerová,Joel D. Blum,Marcus W. Johnson,等. Mercury abundance and isotopic composition indicate subaerial volcanism prior to the end-Archean “whiff” of oxygen[J]. Proceedings of the National Academy of Science,2021. |
APA | Jana Meixnerová.,Joel D. Blum.,Marcus W. Johnson.,Eva E. Stüeken.,Michael A. Kipp.,...&Roger Buick.(2021).Mercury abundance and isotopic composition indicate subaerial volcanism prior to the end-Archean “whiff” of oxygen.Proceedings of the National Academy of Science. |
MLA | Jana Meixnerová,et al."Mercury abundance and isotopic composition indicate subaerial volcanism prior to the end-Archean “whiff” of oxygen".Proceedings of the National Academy of Science (2021). |
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